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Add circle drawing/filling to xlcd

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Change-Id: I5d28ade42145d9d82babcf62c0db7948927cafec
This commit is contained in:
Franklin Wei 2015-04-08 14:15:20 -04:00 • committed by Gerrit Rockbox
parent c6996ab731
commit 90f1370bbf
2 changed files with 105 additions and 0 deletions
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5
apps/plugins/lib/xlcd.h
View file

@ -31,6 +31,11 @@
void xlcd_filltriangle(int x1, int y1, int x2, int y2, int x3, int y3);
void xlcd_filltriangle_screen(struct screen* display,
int x1, int y1, int x2, int y2, int x3, int y3);
void xlcd_fillcircle(int cx, int cy, int radius);
void xlcd_fillcircle_screen(struct screen* display, int cx, int cy, int radius);
void xlcd_drawcircle(int cx, int cy, int radius);
void xlcd_drawcircle_screen(struct screen* display, int cx, int cy, int radius);
#if LCD_DEPTH >= 8
void xlcd_gray_bitmap_part(const unsigned char *src, int src_x, int src_y,
int stride, int x, int y, int width, int height);

100
apps/plugins/lib/xlcd_draw.c
View file

@ -170,6 +170,106 @@ void xlcd_filltriangle_screen(struct screen* display,
xlcd_filltriangle_vertical(display, x1, y1, x2, y2, x3, y3);
}
static void xlcd_fillcircle_horizontal(struct screen* display,
int cx, int cy, int radius)
{
int d = 3 - (radius * 2);
int x = 0;
int y = radius;
while(x <= y)
{
display->hline(cx - x, cx + x, cy + y);
display->hline(cx - x, cx + x, cy - y);
display->hline(cx - y, cx + y, cy + x);
display->hline(cx - y, cx + y, cy - x);
if(d < 0)
{
d += (x * 4) + 6;
}
else
{
d += ((x - y) * 4) + 10;
--y;
}
++x;
}
}
static void xlcd_fillcircle_vertical(struct screen* display,
int cx, int cy, int radius)
{
int d = 3 - (radius * 2);
int x = 0;
int y = radius;
while(x <= y)
{
display->vline(cx + x, cy + y, cy - y);
display->vline(cx - x, cy + y, cy - y);
display->vline(cy + x, cx + y, cx - y);
display->vline(cy - x, cx + y, cx - y);
if(d < 0)
{
d += (x * 4) + 6;
}
else
{
d += ((x - y) * 4) + 10;
--y;
}
++x;
}
}
void xlcd_fillcircle_screen(struct screen* display,
int cx, int cy, int radius)
{
if(display->pixel_format == HORIZONTAL_PACKING || display->depth >= 8)
xlcd_fillcircle_horizontal(display, cx, cy, radius);
else
xlcd_fillcircle_vertical(display, cx, cy, radius);
}
void xlcd_fillcircle(int cx, int cy, int radius)
{
xlcd_fillcircle_screen(rb->screens[SCREEN_MAIN], cx, cy, radius);
}
void xlcd_drawcircle_screen(struct screen* display,
int cx, int cy, int radius)
{
int d = 3 - (radius * 2);
int x = 0;
int y = radius;
while(x <= y)
{
display->drawpixel(cx + x, cy + y);
display->drawpixel(cx - x, cy + y);
display->drawpixel(cx + x, cy - y);
display->drawpixel(cx - x, cy - y);
display->drawpixel(cx + y, cy + x);
display->drawpixel(cx - y, cy + x);
display->drawpixel(cx + y, cy - x);
display->drawpixel(cx - y, cy - x);
if(d < 0)
{
d += (x * 4) + 6;
}
else
{
d += ((x - y) * 4) + 10;
--y;
}
++x;
}
}
void xlcd_drawcircle(int cx, int cy, int radius)
{
/* default is main screen */
xlcd_drawcircle_screen(rb->screens[SCREEN_MAIN], cx, cy, radius);
}
#if LCD_DEPTH >= 8 && LCD_DEPTH <= 16
#ifdef HAVE_LCD_COLOR