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This commit is contained in:
Nils Berglund
2025-01-11 19:25:51 +01:00
committed by GitHub
parent ac6280f770
commit 8a20ab883a
18 changed files with 2539 additions and 289 deletions
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158
sub_wave_3d.c
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@@ -2503,3 +2503,161 @@ void init_wave_fields(t_wave wave[NX*NY])
}
}
int init_xyin_from_image_3d(short int *xy_in)
/* initialize table xy_in from an image file */
{
FILE *image_file;
int nx, ny, maxrgb, i, j, k, ii, jj, nmaxpixels, rgbtot, rgbmax, scan, rgbval, sign;
int *rgb_values;
double scalex, scaley, scale;
short int flipy = 1;
switch (IMAGE_FILE)
{
case (IM_PHOTONS):
{
image_file = fopen("PHOTONSband.ppm", "r");
nmaxpixels = 2000000;
break;
}
case (IM_GUITAR):
{
image_file = fopen("guitar.ppm", "r");
nmaxpixels = 11059200;
break;
}
case (IM_GUITAR_NOHOLE):
{
image_file = fopen("guitar_nohole.ppm", "r");
nmaxpixels = 11059200;
break;
}
case (IM_EGUITAR):
{
image_file = fopen("electric_guitar.ppm", "r");
nmaxpixels = 2459520;
break;
}
case (IM_HAPPY_NEW_YEAR):
{
image_file = fopen("Happy_New_Year_2025.ppm", "r");
nmaxpixels = 2073600;
break;
}
case (IM_DICKSON):
{
image_file = fopen("Greenland.ppm", "r");
nmaxpixels = 1756*948;
break;
}
case (IM_DICKSON_ZOOM):
{
image_file = fopen("Dickson_fjord.ppm", "r");
nmaxpixels = 1070*601;
break;
}
}
scan = fscanf(image_file,"%i %i\n", &nx, &ny);
scan = fscanf(image_file,"%i\n", &maxrgb);
rgb_values = (int *)malloc(3*nmaxpixels*sizeof(int));
scalex = (double)nx/(double)NX;
scaley = (double)ny/(double)NY;
switch (IMAGE_FILE)
{
case (IM_PHOTONS):
{
rgbmax = 3*maxrgb/2;
scale = scalex;
sign = 1;
break;
}
case (IM_GUITAR):
{
rgbmax = 150;
scale = scaley;
sign = 1;
break;
}
case (IM_GUITAR_NOHOLE):
{
rgbmax = 150;
scale = scaley;
sign = 1;
break;
}
case (IM_EGUITAR):
{
rgbmax = 700;
scale = scaley;
sign = -1;
break;
}
case (IM_HAPPY_NEW_YEAR):
{
rgbmax = 3*maxrgb/2;
scale = scalex;
sign = -1;
break;
}
case (IM_DICKSON):
{
rgbmax = 1;
scale = scalex;
sign = -1;
flipy = -1;
break;
}
case (IM_DICKSON_ZOOM):
{
rgbmax = 1;
scale = scalex;
sign = -1;
flipy = -1;
break;
}
}
if (nx*ny > nmaxpixels)
{
printf("Image too large, increase nmaxpixels in init_xyin_from_image() to %i\n", nx*ny);
exit(0);
}
/* read rgb values */
for (j=0; j<ny; j++)
for (i=0; i<nx; i++)
for (k=0; k<3; k++)
{
scan = fscanf(image_file,"%i\n", &rgbval);
rgb_values[3*(j*nx+i)+k] = rgbval;
}
for (i=0; i<NX; i++)
for (j=0; j<NY; j++)
{
ii = nx/2 + (int)((double)(i-NX/2)*scale);
jj = ny/2 - flipy*(int)((double)(j-NY/2)*scale);
if (ii > nx-1) ii = nx-1;
if (ii < 0) ii = 0;
if (jj > ny-1) jj = ny-1;
if (jj < 0) jj = 0;
k = 3*(jj*nx+ii);
rgbtot = rgb_values[k] + rgb_values[k+1] + rgb_values[k+2];
if (rgbtot*sign > rgbmax*sign) xy_in[i*NY+j] = 1;
else xy_in[i*NY+j] = 0;
if (ii == 0) xy_in[i*NY+j] = 0;
// if (ii == nx-1) xy_in[i*NY+j] = 0;
}
fclose(image_file);
free(rgb_values);
return(1);
}