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mandelbrot: center coordinate reference on the images center

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-11 23:43:38 +01:00
parent aa198ad679
commit dece017280
1 changed files with 4 additions and 4 deletions
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8
libavfilter/vsrc_mandelbrot.c
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@ -56,8 +56,8 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
int ret;
mb->maxiter=256;
mb->start_x=-2.0;
mb->start_y=-1.5;
mb->start_x=0;
mb->start_y=0;
mb->start_scale=3.0;
mb->bailout=100;
mb->outer= NORMALIZED_ITERATION_COUNT;
@ -121,8 +121,8 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
for(y=0; y<mb->h; y++){
for(x=0; x<mb->w; x++){
const double cr=mb->start_x+mb->start_scale*x;
const double ci=mb->start_y+mb->start_scale*y;
const double cr=mb->start_x+mb->start_scale*(x-mb->w/2);
const double ci=mb->start_y+mb->start_scale*(y-mb->h/2);
double zr=cr;
double zi=ci;
uint32_t c=0;