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Code Issues 8 Releases Activity

Added methods for drawing lines and circles to Window.

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This commit is contained in:
Fabian Schlenz 2019-06-15 14:16:27 +02:00
parent 989eabee4a
commit 02b3bbcea8
2 changed files with 76 additions and 1 deletions
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5
include/Window.h
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@ -18,7 +18,10 @@ public:
void clear(CRGB* color);
void setPixel(uint8_t x, uint8_t y, CRGB* color);
void setPixelByIndex(uint16_t index, CRGB* color);
void line(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, CRGB* color, bool antialias=false);
void line(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, CRGB* color);
void lineWithAngle(uint8_t x, uint8_t y, uint8_t angle, uint8_t length, CRGB* color);
void lineWithAngle(uint8_t x, uint8_t y, uint8_t angle, uint8_t startdist, uint8_t length, CRGB* color);
void circle(uint8_t x, uint8_t y, uint8_t r, CRGB* color);
uint16_t coordsToGlobalIndex(uint8_t x, uint8_t y);
uint16_t localToGlobalIndex(uint16_t);
void drawChar(Font* f, uint8_t x, uint8_t y, const char c, CRGB* color, bool mask=false);

72
src/Window.cpp
View File

@ -60,3 +60,75 @@ void Window::fadeToBlackBy(fract8 speed) {
leds[coordsToGlobalIndex(x, y)].nscale8(255 - speed);
}
}
void Window::line(uint8_t x1, uint8_t y1, uint8_t x2, uint8_t y2, CRGB* color) {
// Bresenham algorithm
int16_t dx = abs(x2-x1);
int16_t dy = abs(y2-y1);
int8_t sx = x1<x2 ? 1 : -1;
int8_t sy = y1<y2 ? 1 : -1;
int16_t err = dx + dy;
int16_t e2;
while (1) {
setPixel(x1, y1, color);
if (x1==x2 && y1==y2) break;
e2 = 2*err;
if (e2 > dy) { err += dy; x1 += sx; }
if (e2 < dx) { err += dx; y1 += sy; }
}
}
void Window::circle(uint8_t x0, uint8_t y0, uint8_t radius, CRGB* color) {
// Again, Bresenham
uint8_t f = 1 - radius;
int16_t ddF_x = 0;
int16_t ddF_y = -2 * radius;
uint8_t x = 0;
uint8_t y = radius;
setPixel(x0, y0 + radius, color);
setPixel(x0, y0 - radius, color);
setPixel(x0 + radius, y0, color);
setPixel(x0 - radius, y0, color);
while (x < y) {
if (f >= 0) {
y--;
ddF_y += 2;
f += ddF_y;
}
x++;
ddF_x += 2;
f += ddF_x + 1;
setPixel(x0 + x, y0 + y, color);
setPixel(x0 - x, y0 + y, color);
setPixel(x0 + x, y0 - y, color);
setPixel(x0 - x, y0 - y, color);
setPixel(x0 + y, y0 + x, color);
setPixel(x0 - y, y0 + x, color);
setPixel(x0 + y, y0 - x, color);
setPixel(x0 - y, y0 - x, color);
}
}
void Window::lineWithAngle(uint8_t x, uint8_t y, uint8_t angle, uint8_t length, CRGB* color) {
lineWithAngle(x, y, angle, 0, length, color);
}
void Window::lineWithAngle(uint8_t x, uint8_t y, uint8_t angle, uint8_t startdist, uint8_t length, CRGB* color) {
int16_t x1 = x;
int16_t y1 = y;
if (startdist > 0) {
x1 = x + scale8(startdist, cos8(angle));
y1 = y + scale8(startdist, sin8(angle));
}
int16_t x2 = x + scale8(startdist + length, cos8(angle));
int16_t y2 = y + scale8(startdist + length, sin8(angle));
line(x1, y1, x2, y2, color);
}