颜色映射图例，规格尺寸修改

src/serial/serial_backend.cpp

@@ -18,8 +18,6 @@ SerialBackend::SerialBackend(QObject* parent)
     , m_decodeThread(&m_packetQueue, &m_frameQueue) {
     m_request.dataLength = 24;
     m_spec.model = QStringLiteral("PZR-A");
-    m_spec.rows = 3;
-    m_spec.cols = 4;
 
     auto codec = std::make_shared<PiezoresistiveACodec>();
     auto decoder = std::make_shared<PiezoresistiveADecoder>();
@@ -270,6 +268,16 @@ void SerialBackend::feedBytes(const QByteArray& data) {
     m_readThread.enqueueBytes(data);
 }
 
+void SerialBackend::setSensorWidth(int w) {
+    m_spec.cols = w;
+    syncSendConfig_();
+}
+
+void SerialBackend::setSensorHeight(int h) {
+    m_spec.rows = h;
+    syncSendConfig_();
+}
+
 void SerialBackend::drainFrames_() {
     if (!m_frameCallback)
         return;