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Overflow error fix

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4531 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2004-04-20 23:11:12 +00:00
parent 6f28bc2f5b
commit bf8c3056f9
1 changed files with 12 additions and 12 deletions
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24
apps/plugins/mandelbrot.c
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@ -38,10 +38,10 @@ static int delta;
static int max_iter; static int max_iter;
void init_mandelbrot_set(void){ void init_mandelbrot_set(void){
x_min = -5<<27; // -2.5<<28 x_min = -5<<25; // -2.5<<26
x_max = 1<<28; // 1.0<<28 x_max = 1<<26; // 1.0<<26
y_min = -1<<28; // -1.0<<28 y_min = -1<<26; // -1.0<<26
y_max = 1<<28; // 1.0<<28 y_max = 1<<26; // 1.0<<26
delta = (x_max - x_min) >> 3; // /8 delta = (x_max - x_min) >> 3; // /8
max_iter = 25; max_iter = 25;
} }
@ -71,12 +71,12 @@ void calc_mandelbrot_set(void){
n_iter = 0; n_iter = 0;
while (++n_iter<=max_iter) { while (++n_iter<=max_iter) {
x >>= 14; x >>= 13;
y >>= 14; y >>= 13;
x2 = x * x; x2 = x * x;
y2 = y * y; y2 = y * y;
if (x2 + y2 > (4<<28)) break; if (x2 + y2 > (4<<26)) break;
y = 2 * x * y + b; y = 2 * x * y + b;
x = x2 - y2 + a; x = x2 - y2 + a;
@ -114,7 +114,7 @@ enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
rb = api; rb = api;
init_mandelbrot_set(); init_mandelbrot_set();
lcd_aspect_ratio = ((LCD_WIDTH<<14) / LCD_HEIGHT)<<14; lcd_aspect_ratio = ((LCD_WIDTH<<13) / LCD_HEIGHT)<<13;
/* main loop */ /* main loop */
while (true){ while (true){
@ -132,8 +132,8 @@ enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
return PLUGIN_OK; return PLUGIN_OK;
case BUTTON_ON: case BUTTON_ON:
x_min -= ((delta>>14)*(lcd_aspect_ratio>>14)); x_min -= ((delta>>13)*(lcd_aspect_ratio>>13));
x_max += ((delta>>14)*(lcd_aspect_ratio>>14)); x_max += ((delta>>13)*(lcd_aspect_ratio>>13));
y_min -= delta; y_min -= delta;
y_max += delta; y_max += delta;
delta = (x_max - x_min) >> 3; delta = (x_max - x_min) >> 3;
@ -141,8 +141,8 @@ enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
case BUTTON_PLAY: case BUTTON_PLAY:
x_min += ((delta>>14)*(lcd_aspect_ratio>>14)); x_min += ((delta>>13)*(lcd_aspect_ratio>>13));
x_max -= ((delta>>14)*(lcd_aspect_ratio>>14)); x_max -= ((delta>>13)*(lcd_aspect_ratio>>13));
y_min += delta; y_min += delta;
y_max -= delta; y_max -= delta;
delta = (x_max - x_min) >> 3; delta = (x_max - x_min) >> 3;