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@@ -1,743 +0,0 @@
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-/*
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- Simple DirectMedia Layer
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- Copyright (C) 1997-2022 Sam Lantinga <slouken@libsdl.org>
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-
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- This software is provided 'as-is', without any express or implied
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- warranty. In no event will the authors be held liable for any damages
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- arising from the use of this software.
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-
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- Permission is granted to anyone to use this software for any purpose,
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- including commercial applications, and to alter it and redistribute it
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- freely, subject to the following restrictions:
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-
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- 1. The origin of this software must not be misrepresented; you must not
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- claim that you wrote the original software. If you use this software
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- in a product, an acknowledgment in the product documentation would be
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- appreciated but is not required.
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- 2. Altered source versions must be plainly marked as such, and must not be
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- misrepresented as being the original software.
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- 3. This notice may not be removed or altered from any source distribution.
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-*/
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-
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-#include "SDL_internal.h"
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-
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-/* General gesture handling code for SDL */
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-
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-#include "SDL_events_c.h"
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-#include "SDL_gesture_c.h"
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-
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-/*
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-#include <stdio.h>
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-*/
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-
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-/* TODO: Replace with SDL_malloc */
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-
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-#define MAXPATHSIZE 1024
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-
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-#define ENABLE_DOLLAR
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-
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-#define DOLLARNPOINTS 64
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-
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-#if defined(ENABLE_DOLLAR)
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-#define DOLLARSIZE 256
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-#define PHI 0.618033989
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-#endif
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-
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-typedef struct
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-{
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- float x, y;
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-} SDL_FloatPoint;
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-
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-typedef struct
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-{
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- float length;
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-
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- int numPoints;
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- SDL_FloatPoint p[MAXPATHSIZE];
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-} SDL_DollarPath;
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-
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-typedef struct
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-{
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- SDL_FloatPoint path[DOLLARNPOINTS];
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- unsigned long hash;
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-} SDL_DollarTemplate;
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-
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-typedef struct
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-{
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- SDL_TouchID id;
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- SDL_FloatPoint centroid;
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- SDL_DollarPath dollarPath;
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- Uint16 numDownFingers;
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-
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- int numDollarTemplates;
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- SDL_DollarTemplate *dollarTemplate;
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-
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- SDL_bool recording;
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-} SDL_GestureTouch;
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-
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-static SDL_GestureTouch *SDL_gestureTouch;
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-static int SDL_numGestureTouches = 0;
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-static SDL_bool recordAll;
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-
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-#if 0
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-static void PrintPath(SDL_FloatPoint *path)
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-{
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- int i;
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- printf("Path:");
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- for (i=0; i<DOLLARNPOINTS; i++) {
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- printf(" (%f,%f)",path[i].x,path[i].y);
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- }
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- printf("\n");
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-}
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-#endif
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-
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-int SDL_RecordGesture(SDL_TouchID touchId)
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-{
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- int i;
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- if (touchId < 0) {
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- recordAll = SDL_TRUE;
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- }
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- for (i = 0; i < SDL_numGestureTouches; i++) {
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- if ((touchId < 0) || (SDL_gestureTouch[i].id == touchId)) {
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- SDL_gestureTouch[i].recording = SDL_TRUE;
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- if (touchId >= 0) {
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- return 1;
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- }
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- }
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- }
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- return touchId < 0;
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-}
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-
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-void SDL_GestureQuit()
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-{
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- SDL_free(SDL_gestureTouch);
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- SDL_gestureTouch = NULL;
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-}
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-
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-static unsigned long SDL_HashDollar(SDL_FloatPoint *points)
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-{
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- unsigned long hash = 5381;
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- int i;
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- for (i = 0; i < DOLLARNPOINTS; i++) {
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- hash = ((hash << 5) + hash) + (unsigned long)points[i].x;
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- hash = ((hash << 5) + hash) + (unsigned long)points[i].y;
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- }
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- return hash;
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-}
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-
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-static int SaveTemplate(SDL_DollarTemplate *templ, SDL_RWops *dst)
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-{
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- if (dst == NULL) {
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- return 0;
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- }
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-
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- /* No Longer storing the Hash, rehash on load */
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- /* if (SDL_RWops.write(dst, &(templ->hash), sizeof(templ->hash), 1) != 1) return 0; */
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-
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-#if SDL_BYTEORDER == SDL_LIL_ENDIAN
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- if (SDL_RWwrite(dst, templ->path,
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- sizeof(templ->path[0]), DOLLARNPOINTS) != DOLLARNPOINTS) {
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- return 0;
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- }
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-#else
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- {
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- SDL_DollarTemplate copy = *templ;
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- SDL_FloatPoint *p = copy.path;
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- int i;
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- for (i = 0; i < DOLLARNPOINTS; i++, p++) {
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- p->x = SDL_SwapFloatLE(p->x);
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- p->y = SDL_SwapFloatLE(p->y);
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- }
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-
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- if (SDL_RWwrite(dst, copy.path,
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- sizeof(copy.path[0]), DOLLARNPOINTS) != DOLLARNPOINTS) {
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- return 0;
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- }
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- }
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-#endif
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-
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- return 1;
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-}
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-
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-int SDL_SaveAllDollarTemplates(SDL_RWops *dst)
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-{
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- int i, j, rtrn = 0;
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- for (i = 0; i < SDL_numGestureTouches; i++) {
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- SDL_GestureTouch *touch = &SDL_gestureTouch[i];
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- for (j = 0; j < touch->numDollarTemplates; j++) {
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- rtrn += SaveTemplate(&touch->dollarTemplate[j], dst);
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- }
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- }
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- return rtrn;
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-}
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-
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-int SDL_SaveDollarTemplate(SDL_GestureID gestureId, SDL_RWops *dst)
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-{
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- int i, j;
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- for (i = 0; i < SDL_numGestureTouches; i++) {
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- SDL_GestureTouch *touch = &SDL_gestureTouch[i];
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- for (j = 0; j < touch->numDollarTemplates; j++) {
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- if (touch->dollarTemplate[j].hash == gestureId) {
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- return SaveTemplate(&touch->dollarTemplate[j], dst);
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- }
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- }
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- }
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- return SDL_SetError("Unknown gestureId");
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-}
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-
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-/* path is an already sampled set of points
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-Returns the index of the gesture on success, or -1 */
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-static int SDL_AddDollarGesture_one(SDL_GestureTouch *inTouch, SDL_FloatPoint *path)
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-{
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- SDL_DollarTemplate *dollarTemplate;
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- SDL_DollarTemplate *templ;
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- int index;
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-
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- index = inTouch->numDollarTemplates;
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- dollarTemplate =
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- (SDL_DollarTemplate *)SDL_realloc(inTouch->dollarTemplate,
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- (index + 1) *
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- sizeof(SDL_DollarTemplate));
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- if (dollarTemplate == NULL) {
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- return SDL_OutOfMemory();
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- }
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- inTouch->dollarTemplate = dollarTemplate;
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-
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- templ = &inTouch->dollarTemplate[index];
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- SDL_memcpy(templ->path, path, DOLLARNPOINTS * sizeof(SDL_FloatPoint));
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- templ->hash = SDL_HashDollar(templ->path);
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- inTouch->numDollarTemplates++;
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-
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- return index;
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-}
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-
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-static int SDL_AddDollarGesture(SDL_GestureTouch *inTouch, SDL_FloatPoint *path)
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-{
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- int index = -1;
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- int i = 0;
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- if (inTouch == NULL) {
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- if (SDL_numGestureTouches == 0) {
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- return SDL_SetError("no gesture touch devices registered");
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- }
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- for (i = 0; i < SDL_numGestureTouches; i++) {
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- inTouch = &SDL_gestureTouch[i];
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- index = SDL_AddDollarGesture_one(inTouch, path);
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- if (index < 0) {
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- return -1;
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- }
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- }
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- /* Use the index of the last one added. */
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- return index;
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- }
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- return SDL_AddDollarGesture_one(inTouch, path);
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-}
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-
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-int SDL_LoadDollarTemplates(SDL_TouchID touchId, SDL_RWops *src)
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-{
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- int i, loaded = 0;
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- SDL_GestureTouch *touch = NULL;
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- if (src == NULL) {
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- return 0;
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- }
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- if (touchId >= 0) {
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- for (i = 0; i < SDL_numGestureTouches; i++) {
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- if (SDL_gestureTouch[i].id == touchId) {
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- touch = &SDL_gestureTouch[i];
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- }
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- }
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- if (touch == NULL) {
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- return SDL_SetError("given touch id not found");
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- }
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- }
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-
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- while (1) {
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- SDL_DollarTemplate templ;
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-
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- if (SDL_RWread(src, templ.path, sizeof(templ.path[0]), DOLLARNPOINTS) < DOLLARNPOINTS) {
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- if (loaded == 0) {
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- return SDL_SetError("could not read any dollar gesture from rwops");
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- }
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- break;
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- }
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-
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-#if SDL_BYTEORDER != SDL_LIL_ENDIAN
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- for (i = 0; i < DOLLARNPOINTS; i++) {
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- SDL_FloatPoint *p = &templ.path[i];
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- p->x = SDL_SwapFloatLE(p->x);
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- p->y = SDL_SwapFloatLE(p->y);
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- }
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-#endif
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-
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- if (touchId >= 0) {
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- /* printf("Adding loaded gesture to 1 touch\n"); */
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- if (SDL_AddDollarGesture(touch, templ.path) >= 0) {
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- loaded++;
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- }
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- } else {
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- /* printf("Adding to: %i touches\n",SDL_numGestureTouches); */
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- for (i = 0; i < SDL_numGestureTouches; i++) {
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- touch = &SDL_gestureTouch[i];
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- /* printf("Adding loaded gesture to + touches\n"); */
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- /* TODO: What if this fails? */
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- SDL_AddDollarGesture(touch, templ.path);
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- }
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- loaded++;
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- }
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- }
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-
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- return loaded;
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-}
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-
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-#if defined(ENABLE_DOLLAR)
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-static float dollarDifference(SDL_FloatPoint *points, SDL_FloatPoint *templ, float ang)
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-{
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- /* SDL_FloatPoint p[DOLLARNPOINTS]; */
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- float dist = 0;
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- SDL_FloatPoint p;
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- int i;
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- for (i = 0; i < DOLLARNPOINTS; i++) {
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- p.x = (float)(points[i].x * SDL_cos(ang) - points[i].y * SDL_sin(ang));
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- p.y = (float)(points[i].x * SDL_sin(ang) + points[i].y * SDL_cos(ang));
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- dist += (float)(SDL_sqrt((p.x - templ[i].x) * (p.x - templ[i].x) +
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- (p.y - templ[i].y) * (p.y - templ[i].y)));
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- }
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- return dist / DOLLARNPOINTS;
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-}
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-
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-static float bestDollarDifference(SDL_FloatPoint *points, SDL_FloatPoint *templ)
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-{
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- /*------------BEGIN DOLLAR BLACKBOX------------------
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- -TRANSLATED DIRECTLY FROM PSUDEO-CODE AVAILABLE AT-
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- -"http://depts.washington.edu/aimgroup/proj/dollar/"
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- */
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- double ta = -SDL_PI_D / 4;
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- double tb = SDL_PI_D / 4;
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- double dt = SDL_PI_D / 90;
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- float x1 = (float)(PHI * ta + (1 - PHI) * tb);
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- float f1 = dollarDifference(points, templ, x1);
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- float x2 = (float)((1 - PHI) * ta + PHI * tb);
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- float f2 = dollarDifference(points, templ, x2);
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- while (SDL_fabs(ta - tb) > dt) {
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- if (f1 < f2) {
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- tb = x2;
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- x2 = x1;
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- f2 = f1;
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- x1 = (float)(PHI * ta + (1 - PHI) * tb);
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- f1 = dollarDifference(points, templ, x1);
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- } else {
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- ta = x1;
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- x1 = x2;
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- f1 = f2;
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- x2 = (float)((1 - PHI) * ta + PHI * tb);
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- f2 = dollarDifference(points, templ, x2);
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- }
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- }
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- /*
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- if (f1 <= f2)
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- printf("Min angle (x1): %f\n",x1);
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- else if (f1 > f2)
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- printf("Min angle (x2): %f\n",x2);
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- */
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- return SDL_min(f1, f2);
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-}
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-
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-/* DollarPath contains raw points, plus (possibly) the calculated length */
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-static int dollarNormalize(const SDL_DollarPath *path, SDL_FloatPoint *points, SDL_bool is_recording)
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-{
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- int i;
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- float interval;
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- float dist;
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- int numPoints = 0;
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- SDL_FloatPoint centroid;
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- float xmin, xmax, ymin, ymax;
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- float ang;
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- float w, h;
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- float length = path->length;
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-
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- /* Calculate length if it hasn't already been done */
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- if (length <= 0) {
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- for (i = 1; i < path->numPoints; i++) {
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- float dx = path->p[i].x - path->p[i - 1].x;
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- float dy = path->p[i].y - path->p[i - 1].y;
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- length += (float)(SDL_sqrt(dx * dx + dy * dy));
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- }
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- }
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-
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- /* Resample */
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- interval = length / (DOLLARNPOINTS - 1);
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- dist = interval;
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-
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- centroid.x = 0;
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- centroid.y = 0;
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-
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- /* printf("(%f,%f)\n",path->p[path->numPoints-1].x,path->p[path->numPoints-1].y); */
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- for (i = 1; i < path->numPoints; i++) {
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- float d = (float)(SDL_sqrt((path->p[i - 1].x - path->p[i].x) * (path->p[i - 1].x - path->p[i].x) +
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- (path->p[i - 1].y - path->p[i].y) * (path->p[i - 1].y - path->p[i].y)));
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- /* printf("d = %f dist = %f/%f\n",d,dist,interval); */
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- while (dist + d > interval) {
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- points[numPoints].x = path->p[i - 1].x +
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- ((interval - dist) / d) * (path->p[i].x - path->p[i - 1].x);
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- points[numPoints].y = path->p[i - 1].y +
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- ((interval - dist) / d) * (path->p[i].y - path->p[i - 1].y);
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- centroid.x += points[numPoints].x;
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- centroid.y += points[numPoints].y;
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- numPoints++;
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-
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- dist -= interval;
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- }
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- dist += d;
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- }
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- if (numPoints < DOLLARNPOINTS - 1) {
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- if (is_recording) {
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- SDL_SetError("ERROR: NumPoints = %i", numPoints);
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- }
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- return 0;
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- }
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- /* copy the last point */
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- points[DOLLARNPOINTS - 1] = path->p[path->numPoints - 1];
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- numPoints = DOLLARNPOINTS;
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-
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- centroid.x /= numPoints;
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- centroid.y /= numPoints;
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-
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- /* printf("Centroid (%f,%f)",centroid.x,centroid.y); */
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- /* Rotate Points so point 0 is left of centroid and solve for the bounding box */
|
|
|
- xmin = centroid.x;
|
|
|
- xmax = centroid.x;
|
|
|
- ymin = centroid.y;
|
|
|
- ymax = centroid.y;
|
|
|
-
|
|
|
- ang = (float)(SDL_atan2(centroid.y - points[0].y,
|
|
|
- centroid.x - points[0].x));
|
|
|
-
|
|
|
- for (i = 0; i < numPoints; i++) {
|
|
|
- float px = points[i].x;
|
|
|
- float py = points[i].y;
|
|
|
- points[i].x = (float)((px - centroid.x) * SDL_cos(ang) -
|
|
|
- (py - centroid.y) * SDL_sin(ang) + centroid.x);
|
|
|
- points[i].y = (float)((px - centroid.x) * SDL_sin(ang) +
|
|
|
- (py - centroid.y) * SDL_cos(ang) + centroid.y);
|
|
|
-
|
|
|
- if (points[i].x < xmin) {
|
|
|
- xmin = points[i].x;
|
|
|
- }
|
|
|
- if (points[i].x > xmax) {
|
|
|
- xmax = points[i].x;
|
|
|
- }
|
|
|
- if (points[i].y < ymin) {
|
|
|
- ymin = points[i].y;
|
|
|
- }
|
|
|
- if (points[i].y > ymax) {
|
|
|
- ymax = points[i].y;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- /* Scale points to DOLLARSIZE, and translate to the origin */
|
|
|
- w = xmax - xmin;
|
|
|
- h = ymax - ymin;
|
|
|
-
|
|
|
- for (i = 0; i < numPoints; i++) {
|
|
|
- points[i].x = (points[i].x - centroid.x) * DOLLARSIZE / w;
|
|
|
- points[i].y = (points[i].y - centroid.y) * DOLLARSIZE / h;
|
|
|
- }
|
|
|
- return numPoints;
|
|
|
-}
|
|
|
-
|
|
|
-static float dollarRecognize(const SDL_DollarPath *path, int *bestTempl, SDL_GestureTouch *touch)
|
|
|
-{
|
|
|
- SDL_FloatPoint points[DOLLARNPOINTS];
|
|
|
- int i;
|
|
|
- float bestDiff = 10000;
|
|
|
-
|
|
|
- SDL_memset(points, 0, sizeof(points));
|
|
|
-
|
|
|
- dollarNormalize(path, points, SDL_FALSE);
|
|
|
-
|
|
|
- /* PrintPath(points); */
|
|
|
- *bestTempl = -1;
|
|
|
- for (i = 0; i < touch->numDollarTemplates; i++) {
|
|
|
- float diff = bestDollarDifference(points, touch->dollarTemplate[i].path);
|
|
|
- if (diff < bestDiff) {
|
|
|
- bestDiff = diff;
|
|
|
- *bestTempl = i;
|
|
|
- }
|
|
|
- }
|
|
|
- return bestDiff;
|
|
|
-}
|
|
|
-#endif
|
|
|
-
|
|
|
-int SDL_GestureAddTouch(SDL_TouchID touchId)
|
|
|
-{
|
|
|
- SDL_GestureTouch *gestureTouch = (SDL_GestureTouch *)SDL_realloc(SDL_gestureTouch,
|
|
|
- (SDL_numGestureTouches + 1) *
|
|
|
- sizeof(SDL_GestureTouch));
|
|
|
-
|
|
|
- if (gestureTouch == NULL) {
|
|
|
- return SDL_OutOfMemory();
|
|
|
- }
|
|
|
-
|
|
|
- SDL_gestureTouch = gestureTouch;
|
|
|
-
|
|
|
- SDL_zero(SDL_gestureTouch[SDL_numGestureTouches]);
|
|
|
- SDL_gestureTouch[SDL_numGestureTouches].id = touchId;
|
|
|
- SDL_numGestureTouches++;
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-int SDL_GestureDelTouch(SDL_TouchID touchId)
|
|
|
-{
|
|
|
- int i;
|
|
|
- for (i = 0; i < SDL_numGestureTouches; i++) {
|
|
|
- if (SDL_gestureTouch[i].id == touchId) {
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (i == SDL_numGestureTouches) {
|
|
|
- /* not found */
|
|
|
- return -1;
|
|
|
- }
|
|
|
-
|
|
|
- SDL_free(SDL_gestureTouch[i].dollarTemplate);
|
|
|
- SDL_zero(SDL_gestureTouch[i]);
|
|
|
-
|
|
|
- SDL_numGestureTouches--;
|
|
|
- if (i != SDL_numGestureTouches) {
|
|
|
- SDL_copyp(&SDL_gestureTouch[i], &SDL_gestureTouch[SDL_numGestureTouches]);
|
|
|
- }
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static SDL_GestureTouch *SDL_GetGestureTouch(SDL_TouchID id)
|
|
|
-{
|
|
|
- int i;
|
|
|
- for (i = 0; i < SDL_numGestureTouches; i++) {
|
|
|
- /* printf("%i ?= %i\n",SDL_gestureTouch[i].id,id); */
|
|
|
- if (SDL_gestureTouch[i].id == id) {
|
|
|
- return &SDL_gestureTouch[i];
|
|
|
- }
|
|
|
- }
|
|
|
- return NULL;
|
|
|
-}
|
|
|
-
|
|
|
-static void SDL_SendGestureMulti(SDL_GestureTouch *touch, float dTheta, float dDist)
|
|
|
-{
|
|
|
- if (SDL_GetEventState(SDL_MULTIGESTURE) == SDL_ENABLE) {
|
|
|
- SDL_Event event;
|
|
|
- event.type = SDL_MULTIGESTURE;
|
|
|
- event.common.timestamp = 0;
|
|
|
- event.mgesture.touchId = touch->id;
|
|
|
- event.mgesture.x = touch->centroid.x;
|
|
|
- event.mgesture.y = touch->centroid.y;
|
|
|
- event.mgesture.dTheta = dTheta;
|
|
|
- event.mgesture.dDist = dDist;
|
|
|
- event.mgesture.numFingers = touch->numDownFingers;
|
|
|
- SDL_PushEvent(&event);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-#if defined(ENABLE_DOLLAR)
|
|
|
-static void SDL_SendGestureDollar(SDL_GestureTouch *touch,
|
|
|
- SDL_GestureID gestureId, float error)
|
|
|
-{
|
|
|
- if (SDL_GetEventState(SDL_DOLLARGESTURE) == SDL_ENABLE) {
|
|
|
- SDL_Event event;
|
|
|
- event.type = SDL_DOLLARGESTURE;
|
|
|
- event.common.timestamp = 0;
|
|
|
- event.dgesture.touchId = touch->id;
|
|
|
- event.dgesture.x = touch->centroid.x;
|
|
|
- event.dgesture.y = touch->centroid.y;
|
|
|
- event.dgesture.gestureId = gestureId;
|
|
|
- event.dgesture.error = error;
|
|
|
- /* A finger came up to trigger this event. */
|
|
|
- event.dgesture.numFingers = touch->numDownFingers + 1;
|
|
|
- SDL_PushEvent(&event);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-static void SDL_SendDollarRecord(SDL_GestureTouch *touch, SDL_GestureID gestureId)
|
|
|
-{
|
|
|
- if (SDL_GetEventState(SDL_DOLLARRECORD) == SDL_ENABLE) {
|
|
|
- SDL_Event event;
|
|
|
- event.type = SDL_DOLLARRECORD;
|
|
|
- event.common.timestamp = 0;
|
|
|
- event.dgesture.touchId = touch->id;
|
|
|
- event.dgesture.gestureId = gestureId;
|
|
|
- SDL_PushEvent(&event);
|
|
|
- }
|
|
|
-}
|
|
|
-#endif
|
|
|
-
|
|
|
-void SDL_GestureProcessEvent(SDL_Event *event)
|
|
|
-{
|
|
|
- float x, y;
|
|
|
-#if defined(ENABLE_DOLLAR)
|
|
|
- int index;
|
|
|
- int i;
|
|
|
- float pathDx, pathDy;
|
|
|
-#endif
|
|
|
- SDL_FloatPoint lastP;
|
|
|
- SDL_FloatPoint lastCentroid;
|
|
|
- float lDist;
|
|
|
- float Dist;
|
|
|
- float dtheta;
|
|
|
- float dDist;
|
|
|
-
|
|
|
- if (event->type == SDL_FINGERMOTION ||
|
|
|
- event->type == SDL_FINGERDOWN ||
|
|
|
- event->type == SDL_FINGERUP) {
|
|
|
- SDL_GestureTouch *inTouch = SDL_GetGestureTouch(event->tfinger.touchId);
|
|
|
-
|
|
|
- /* Shouldn't be possible */
|
|
|
- if (inTouch == NULL) {
|
|
|
- return;
|
|
|
- }
|
|
|
-
|
|
|
- x = event->tfinger.x;
|
|
|
- y = event->tfinger.y;
|
|
|
-
|
|
|
- /* Finger Up */
|
|
|
- if (event->type == SDL_FINGERUP) {
|
|
|
-#if defined(ENABLE_DOLLAR)
|
|
|
- SDL_FloatPoint path[DOLLARNPOINTS];
|
|
|
-#endif
|
|
|
-
|
|
|
- inTouch->numDownFingers--;
|
|
|
-
|
|
|
-#if defined(ENABLE_DOLLAR)
|
|
|
- if (inTouch->recording) {
|
|
|
- inTouch->recording = SDL_FALSE;
|
|
|
- dollarNormalize(&inTouch->dollarPath, path, SDL_TRUE);
|
|
|
- /* PrintPath(path); */
|
|
|
- if (recordAll) {
|
|
|
- index = SDL_AddDollarGesture(NULL, path);
|
|
|
- for (i = 0; i < SDL_numGestureTouches; i++) {
|
|
|
- SDL_gestureTouch[i].recording = SDL_FALSE;
|
|
|
- }
|
|
|
- } else {
|
|
|
- index = SDL_AddDollarGesture(inTouch, path);
|
|
|
- }
|
|
|
-
|
|
|
- if (index >= 0) {
|
|
|
- SDL_SendDollarRecord(inTouch, inTouch->dollarTemplate[index].hash);
|
|
|
- } else {
|
|
|
- SDL_SendDollarRecord(inTouch, -1);
|
|
|
- }
|
|
|
- } else {
|
|
|
- int bestTempl;
|
|
|
- float error;
|
|
|
- error = dollarRecognize(&inTouch->dollarPath,
|
|
|
- &bestTempl, inTouch);
|
|
|
- if (bestTempl >= 0) {
|
|
|
- /* Send Event */
|
|
|
- unsigned long gestureId = inTouch->dollarTemplate[bestTempl].hash;
|
|
|
- SDL_SendGestureDollar(inTouch, gestureId, error);
|
|
|
- /* printf ("%s\n",);("Dollar error: %f\n",error); */
|
|
|
- }
|
|
|
- }
|
|
|
-#endif
|
|
|
- /* inTouch->gestureLast[j] = inTouch->gestureLast[inTouch->numDownFingers]; */
|
|
|
- if (inTouch->numDownFingers > 0) {
|
|
|
- inTouch->centroid.x = (inTouch->centroid.x * (inTouch->numDownFingers + 1) -
|
|
|
- x) /
|
|
|
- inTouch->numDownFingers;
|
|
|
- inTouch->centroid.y = (inTouch->centroid.y * (inTouch->numDownFingers + 1) -
|
|
|
- y) /
|
|
|
- inTouch->numDownFingers;
|
|
|
- }
|
|
|
- } else if (event->type == SDL_FINGERMOTION) {
|
|
|
- float dx = event->tfinger.dx;
|
|
|
- float dy = event->tfinger.dy;
|
|
|
-#if defined(ENABLE_DOLLAR)
|
|
|
- SDL_DollarPath *path = &inTouch->dollarPath;
|
|
|
- if (path->numPoints < MAXPATHSIZE) {
|
|
|
- path->p[path->numPoints].x = inTouch->centroid.x;
|
|
|
- path->p[path->numPoints].y = inTouch->centroid.y;
|
|
|
- pathDx =
|
|
|
- (path->p[path->numPoints].x - path->p[path->numPoints - 1].x);
|
|
|
- pathDy =
|
|
|
- (path->p[path->numPoints].y - path->p[path->numPoints - 1].y);
|
|
|
- path->length += (float)SDL_sqrt(pathDx * pathDx + pathDy * pathDy);
|
|
|
- path->numPoints++;
|
|
|
- }
|
|
|
-#endif
|
|
|
- lastP.x = x - dx;
|
|
|
- lastP.y = y - dy;
|
|
|
- lastCentroid = inTouch->centroid;
|
|
|
-
|
|
|
- inTouch->centroid.x += dx / inTouch->numDownFingers;
|
|
|
- inTouch->centroid.y += dy / inTouch->numDownFingers;
|
|
|
- /* printf("Centrid : (%f,%f)\n",inTouch->centroid.x,inTouch->centroid.y); */
|
|
|
- if (inTouch->numDownFingers > 1) {
|
|
|
- SDL_FloatPoint lv; /* Vector from centroid to last x,y position */
|
|
|
- SDL_FloatPoint v; /* Vector from centroid to current x,y position */
|
|
|
- /* lv = inTouch->gestureLast[j].cv; */
|
|
|
- lv.x = lastP.x - lastCentroid.x;
|
|
|
- lv.y = lastP.y - lastCentroid.y;
|
|
|
- lDist = (float)SDL_sqrt(lv.x * lv.x + lv.y * lv.y);
|
|
|
- /* printf("lDist = %f\n",lDist); */
|
|
|
- v.x = x - inTouch->centroid.x;
|
|
|
- v.y = y - inTouch->centroid.y;
|
|
|
- /* inTouch->gestureLast[j].cv = v; */
|
|
|
- Dist = (float)SDL_sqrt(v.x * v.x + v.y * v.y);
|
|
|
- /* SDL_cos(dTheta) = (v . lv)/(|v| * |lv|) */
|
|
|
-
|
|
|
- /* Normalize Vectors to simplify angle calculation */
|
|
|
- lv.x /= lDist;
|
|
|
- lv.y /= lDist;
|
|
|
- v.x /= Dist;
|
|
|
- v.y /= Dist;
|
|
|
- dtheta = (float)SDL_atan2(lv.x * v.y - lv.y * v.x, lv.x * v.x + lv.y * v.y);
|
|
|
-
|
|
|
- dDist = (Dist - lDist);
|
|
|
- if (lDist == 0) {
|
|
|
- /* To avoid impossible values */
|
|
|
- dDist = 0;
|
|
|
- dtheta = 0;
|
|
|
- }
|
|
|
-
|
|
|
- /* inTouch->gestureLast[j].dDist = dDist;
|
|
|
- inTouch->gestureLast[j].dtheta = dtheta;
|
|
|
-
|
|
|
- printf("dDist = %f, dTheta = %f\n",dDist,dtheta);
|
|
|
- gdtheta = gdtheta*.9 + dtheta*.1;
|
|
|
- gdDist = gdDist*.9 + dDist*.1
|
|
|
- knob.r += dDist/numDownFingers;
|
|
|
- knob.ang += dtheta;
|
|
|
- printf("thetaSum = %f, distSum = %f\n",gdtheta,gdDist);
|
|
|
- printf("id: %i dTheta = %f, dDist = %f\n",j,dtheta,dDist); */
|
|
|
- SDL_SendGestureMulti(inTouch, dtheta, dDist);
|
|
|
- } else {
|
|
|
- /* inTouch->gestureLast[j].dDist = 0;
|
|
|
- inTouch->gestureLast[j].dtheta = 0;
|
|
|
- inTouch->gestureLast[j].cv.x = 0;
|
|
|
- inTouch->gestureLast[j].cv.y = 0; */
|
|
|
- }
|
|
|
- /* inTouch->gestureLast[j].f.p.x = x;
|
|
|
- inTouch->gestureLast[j].f.p.y = y;
|
|
|
- break;
|
|
|
- pressure? */
|
|
|
- } else if (event->type == SDL_FINGERDOWN) {
|
|
|
-
|
|
|
- inTouch->numDownFingers++;
|
|
|
- inTouch->centroid.x = (inTouch->centroid.x * (inTouch->numDownFingers - 1) +
|
|
|
- x) /
|
|
|
- inTouch->numDownFingers;
|
|
|
- inTouch->centroid.y = (inTouch->centroid.y * (inTouch->numDownFingers - 1) +
|
|
|
- y) /
|
|
|
- inTouch->numDownFingers;
|
|
|
- /* printf("Finger Down: (%f,%f). Centroid: (%f,%f\n",x,y,
|
|
|
- inTouch->centroid.x,inTouch->centroid.y); */
|
|
|
-
|
|
|
-#if defined(ENABLE_DOLLAR)
|
|
|
- inTouch->dollarPath.length = 0;
|
|
|
- inTouch->dollarPath.p[0].x = x;
|
|
|
- inTouch->dollarPath.p[0].y = y;
|
|
|
- inTouch->dollarPath.numPoints = 1;
|
|
|
-#endif
|
|
|
- }
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* vi: set ts=4 sw=4 expandtab: */
|
Ryan C. Gordon