颜色映射图例，规格尺寸修改

src/glwidget.h

@@ -14,6 +14,7 @@
 #include <QMatrix4x4>
 #include <QVector3D>
 #include <QString>
+#include <QColor>
 #include <atomic>
 #include <qtmetamacros.h>
 #include <qvectornd.h>
@@ -26,6 +27,8 @@ struct Ray {
 class GLWidget : public QOpenGLWidget, protected QOpenGLFunctions_3_3_Core {
     Q_OBJECT
     Q_PROPERTY(float yaw READ yaw WRITE setYaw NOTIFY yawChanged)
+    Q_PROPERTY(int row READ row WRITE setRow)
+    Q_PROPERTY(int col READ col WRITE setCol)
     // Q_PROPERTY(bool showGrid READ showGrid WRITE setShowGrid NOTIFY showGridChanged)
 public:
     enum RenderMode {
@@ -59,7 +62,8 @@ public:
 
     bool showGrid() const { return m_showGrid; }
 
-    
+    int row() const { return m_rows; }    
+    int col() const { return m_cols; }
 
 public slots:
     // 值域范围，用于 shader 里把 value 映射到颜色（绿->红）
@@ -70,6 +74,11 @@ public slots:
     void setLightMode(bool on);
     void setShowBg(bool on);
     void setShowGrid(bool on);
+    void setCol(int col);
+    void setRow(int row);
+    void setColorLow(const QColor& color);
+    void setColorMid(const QColor& color);
+    void setColorHigh(const QColor& color);
 
 signals:
     void yawChanged();
@@ -85,6 +94,7 @@ protected:
     void wheelEvent(QWheelEvent *event) override;
 
 private:
+    void initGeometry_();
     void initPanelGeometry_();
     void initDotGeometry_();
     void initBackgroundGeometry_();
@@ -154,6 +164,9 @@ private:
     unsigned int m_bgVbo = 0;
     bool m_lightMode = true;
     bool m_showBg = true;
+    QVector3D m_colorLow{0.10f, 0.75f, 1.00f};
+    QVector3D m_colorMid{0.10f, 0.95f, 0.35f};
+    QVector3D m_colorHigh{1.00f, 0.22f, 0.10f};
 
     // MVP = Projection * View * Model。
     // 这里 panel/dots 顶点基本已经是“世界坐标”，所以我们用 proj*view 即可（model 先省略）。