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added lcdDrawEllipse() - contributed by Ben William

ugfx_release_2.6
Tectu 2012-07-10 01:15:31 +02:00
parent 3e6d376e1e
commit ed39db99a5
3 changed files with 30 additions and 0 deletions
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28
glcd.c
View File

@ -319,6 +319,34 @@ void lcdDrawCircle(uint16_t x, uint16_t y, uint16_t radius, uint8_t filled, uint
} while(a <= b);
}
void lcdDrawEllipse(uint16_t x, uint16_t y, uint16_t a, uint16_t b, uint16_t color) {
int dx = 0, dy = b; /* im I. Quadranten von links oben nach rechts unten */
long a2 = a*a, b2 = b*b;
long err = b2-(2*b-1)*a2, e2; /* Fehler im 1. Schritt */
do {
lcdDrawPixel(x+dx, y+dy, color); /* I. Quadrant */
lcdDrawPixel(x-dx, y+dy, color); /* II. Quadrant */
lcdDrawPixel(x-dx, y-dy, color); /* III. Quadrant */
lcdDrawPixel(x+dx, y-dy, color); /* IV. Quadrant */
e2 = 2*err;
if(e2 < (2*dx+1)*b2) {
dx++;
err += (2*dx+1)*b2;
}
if(e2 > -(2*dy-1)*a2) {
dy--;
err -= (2*dy-1)*a2;
}
} while(dy >= 0);
while(dx++ < a) { /* fehlerhafter Abbruch bei flachen Ellipsen (b=1) */
lcdDrawPixel(x+dx, y, color); /* -> Spitze der Ellipse vollenden */
lcdDrawPixel(x-dx, y, color);
}
}
void lcdVerticalScroll(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, int16_t lines) {
lld_lcdVerticalScroll(x0,y0,x1,y1,lines);
}

1
glcd.h
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@ -67,6 +67,7 @@ void lcdDrawLine(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t co
void lcdDrawRect(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint8_t filled, uint16_t color);
void lcdDrawRectString(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, const char* str, font_t font, uint16_t fontColor, uint16_t bkColor);
void lcdDrawCircle(uint16_t x, uint16_t y, uint16_t radius, uint8_t filled, uint16_t color);
void lcdDrawEllipse(uint16_t x, uint16_t y, uint16_t a, uint16_t b, uint16_t color);
/* Text Rendering Functions */
int lcdDrawChar(uint16_t cx, uint16_t cy, char c, font_t font, uint16_t color, uint16_t bkcolor, bool_t tpText);

1
lcd.mk
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@ -8,6 +8,7 @@ LCDSRC = $(LCDLIB)/glcd.c \
$(LCDLIB)/graph.c \
$(LCDLIB)/gui.c \
$(LCDLIB)/console.c \
$(LCDLIB)/fastMath.c \
$(LCD_DRIVERS_SRC)
LCDINC = $(LCDLIB) \