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mandelbrot: add mincol inner coloring method. 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-11-15 19:58:58 +01:00
parent 6f20921dee
commit 8d51cb4fb8
1 changed files with 13 additions and 0 deletions
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13
libavfilter/vsrc_mandelbrot.c
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@ -44,6 +44,7 @@ enum Inner{
BLACK,
PERIOD,
CONVTIME,
MINCOL,
};
typedef struct Point {
@ -96,6 +97,7 @@ static const AVOption mandelbrot_options[] = {
{"black", "set black mode", 0, AV_OPT_TYPE_CONST, {.dbl=BLACK}, INT_MIN, INT_MAX, 0, "inner" },
{"period", "set period mode", 0, AV_OPT_TYPE_CONST, {.dbl=PERIOD}, INT_MIN, INT_MAX, 0, "inner" },
{"convergence", "show time until convergence", 0, AV_OPT_TYPE_CONST, {.dbl=CONVTIME}, INT_MIN, INT_MAX, 0, "inner" },
{"mincol", "color based on point closest to the origin of the cycle", 0, AV_OPT_TYPE_CONST, {.dbl=MINCOL}, INT_MIN, INT_MAX, 0, "inner" },
{NULL},
};
@ -266,6 +268,17 @@ static void draw_mandelbrot(AVFilterContext *ctx, uint32_t *color, int linesize,
}
}else if(mb->inner==CONVTIME){
c= (i*255/mb->maxiter)*0x010101;
} else if(mb->inner==MINCOL){
int j;
double closest=9999;
int closest_index=0;
for(j=i-1; j; j--)
if(SQR(mb->zyklus[j][0]) + SQR(mb->zyklus[j][1]) < closest){
closest= SQR(mb->zyklus[j][0]) + SQR(mb->zyklus[j][1]);
closest_index= j;
}
closest = sqrt(closest);
c= lrintf((mb->zyklus[closest_index][0]/closest+1)*127) + lrintf((mb->zyklus[closest_index][1]/closest+1)*127)*256;
}
}
c |= 0xFF000000;