v.0.0.9 drawHorizontalScrollText

lib/LedMatrix/src/LedMatrix.cpp

@@ -31,7 +31,7 @@ uint8_t LedMatrix::charWidth(const uint8_t *charMatrix)
     // bei 8 -> 32-28 = 4.Bit
     // bei 2 -> 32-20 = 2.Bit
 
-    Serial.printf("max_val: [0x%04X] -> %d\n\r", max_val, (32 - __builtin_clz(max_val)));
+    // Serial.printf("max_val: [0x%04X] -> %d\n\r", max_val, (32 - __builtin_clz(max_val)));
 
     return (max_val == 0) ? 0 : (32 - __builtin_clz(max_val));
 }
@@ -88,3 +88,60 @@ void LedMatrix::drawText(int x, int y, const char *text, CRGB color)
         cursorX += (chr_width + 1); // 5 pixels width + 1 pixel spacing
     }
 }
+
+uint8_t LedMatrix::getTextWidth(const char *text)
+{
+    uint8_t totalWidth = 0;
+    for (uint8_t i = 0; text[i] != '\0'; i++)
+    {
+        const uint8_t *fontData = getFontChar_5x7(text[i]);
+        totalWidth += charWidth<7>(fontData) + 1; // char width + spacing
+    }
+    return totalWidth;
+}
+
+void LedMatrix::clearRow(uint8_t y)
+{
+    const u_int8_t font_height = fontHeight_5x7();
+
+    Serial.printf("clearRow: %dx%d@%d\n\r", font_height, width, y);
+
+    for (uint8_t line = y; line < (y + font_height); line++)
+    {
+        Serial.printf("\tline: %d\n\r", line);
+        for (uint8_t x = 0; x < width; x++)
+        {
+            drawPixel(x, line, CRGB::Black);
+        }
+    }
+}
+
+void LedMatrix::drawHorizontalScrollText(uint8_t y, const char *text, CRGB color, uint8_t scrollSpeed)
+{
+    unsigned long currentTime = millis();
+    uint8_t txtWidth = getTextWidth(text);
+
+    // Update scroll position based on time
+    if (currentTime - lastScrollTime > scrollSpeed)
+    {
+        scrollPosition--;
+        lastScrollTime = currentTime;
+
+        // Reset when text has completely scrolled off screen
+        if (scrollPosition < -txtWidth)
+        {
+            scrollPosition = width;
+        }
+    }
+
+    // Clear the row where text will be drawn
+    clearRow(y);
+
+    // Draw text at current scroll position
+    drawText(scrollPosition, y, text, color);
+
+    show();
+
+    // Serial.printf("drawHorizontalScrollText: %s @[%d; %d]", text, scrollPosition, y);
+    // Serial.println();
+}

lib/LedMatrix/src/LedMatrix.h

@@ -24,6 +24,12 @@ private:
     template <size_t N>
     uint8_t charWidth(const uint8_t *charMatrix);
 
+    // Text Scrolling
+    int8_t scrollPosition = 0;
+    unsigned long lastScrollTime = 0;
+
+    uint8_t getTextWidth(const char *text);
+
 public:
     LedMatrix(uint8_t h = 64, uint8_t w = 64);
 
@@ -31,8 +37,13 @@ public:
 
     void drawPixel(int x, int y, CRGB color);
     uint8_t drawChar(int x, int y, char c, CRGB color);
+
+    void clearRow(uint8_t y);
+
     // Draw text string
     void drawText(int x, int y, const char *text, CRGB color);
+
+    void drawHorizontalScrollText(uint8_t y, const char *text, CRGB color, uint8_t scrollSpeed = 100);
 };
 
 #endif