Add 'drawLineAntialiased'

Nicer way for the hands of the clock to be displayed.

Author: bandi13

wled00/FX.cpp

@@ -4894,9 +4894,9 @@ uint16_t mode_2DAnalogClock(void) {                  // By Andras Fekete (bandi1
 
   SEGMENT.fill(BLACK);
   SEGMENT.draw_circle_antialiased(centerX, centerY, radius, DARKSLATEGRAY);
-  SEGMENT.drawLine(centerX, centerY, second_x, second_y, BLUE);
-  SEGMENT.drawLine(centerX, centerY, minute_x, minute_y, GREEN);
-  SEGMENT.drawLine(centerX, centerY, hour_x, hour_y, RED);
+  SEGMENT.drawLineAntialiased(centerX, centerY, second_x, second_y, BLUE);
+  SEGMENT.drawLineAntialiased(centerX, centerY, minute_x, minute_y, GREEN);
+  SEGMENT.drawLineAntialiased(centerX, centerY, hour_x, hour_y, RED);
 
   return (1000 / WLED_FPS); // calculate once per second
 } // mode_2DAnalogClock()

wled00/FX.h

@@ -630,6 +630,7 @@ typedef struct Segment {
     void fill_circle(uint16_t cx, uint16_t cy, uint8_t radius, CRGB c);
     void drawLine(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint32_t c);
     inline void drawLine(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, CRGB c) { drawLine(x0, y0, x1, y1, RGBW32(c.r,c.g,c.b,0)); } // automatic inline
+    void drawLineAntialiased(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint32_t c);
     void drawCharacter(unsigned char chr, int16_t x, int16_t y, uint8_t w, uint8_t h, uint32_t color, uint32_t col2 = 0, int8_t rotate = 0);
     inline void drawCharacter(unsigned char chr, int16_t x, int16_t y, uint8_t w, uint8_t h, CRGB c) { drawCharacter(chr, x, y, w, h, RGBW32(c.r,c.g,c.b,0)); } // automatic inline
     inline void drawCharacter(unsigned char chr, int16_t x, int16_t y, uint8_t w, uint8_t h, CRGB c, CRGB c2, int8_t rotate = 0) { drawCharacter(chr, x, y, w, h, RGBW32(c.r,c.g,c.b,0), RGBW32(c2.r,c2.g,c2.b,0), rotate); } // automatic inline

wled00/FX_2Dfcn.cpp

@@ -539,6 +539,33 @@ void Segment::drawLine(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint3
   }
 }
 
+//line function
+void Segment::drawLineAntialiased(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint32_t c) {
+  if (!isActive()) return; // not active
+  const uint16_t cols = virtualWidth();
+  const uint16_t rows = virtualHeight();
+  if (x0 >= cols || x1 >= cols || y0 >= rows || y1 >= rows) return;
+  const int16_t dx = abs(x1-x0), sx = x0<x1 ? 1 : -1;
+  const int16_t dy = abs(y1-y0), sy = y0<y1 ? 1 : -1;
+  int16_t err = (dx-dy)/2, e2, x2;
+  int16_t ed = (dx+dy == 0) ? 1 : sqrt((float)dx*dx + (float)dy*dy);
+
+  for (;;) {
+    setPixelColorXY(x0,y0,color_blend(c,getPixelColorXY(x0,y0),0xFFFF * abs(err - dx + dy) / ed, true));
+    e2 = err; x2 = x0;
+    if (e2 >= -dx) {
+      if(x0 == x1) break;
+      if (e2+dy < ed) setPixelColorXY(x0,y0+sy, color_blend(c,getPixelColorXY(x0,y0+sy), 0xFFFF * (e2+dy)/ed, true));
+      err -= dy; x0 += sx;
+    }
+    if (e2 <= dy) {
+      if (y0 == y1) break;
+      if (dx-e2 < ed) setPixelColorXY(x2+sx, y0, color_blend(c,getPixelColorXY(x2+sx,y0), 0xFFFF * (dx-e2)/ed, true));
+      err += dx; y0 += sy;
+    }
+  }
+}
+
 #include "src/font/console_font_4x6.h"
 #include "src/font/console_font_5x8.h"
 #include "src/font/console_font_5x12.h"