Help modifying existing code - Water simulation

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amoeboar

Help modifying existing code - Water simulation

in Programming Questions • 6 months ago

Hello Processing community,

I would like to implement a modified version of this code: http://www.openprocessing.org/sketch/43543

I know I need an underlying image to load the pixels to manipulate.

However, I'd like to only draw the image when it appears under the ripple, otherwise the background is black.

I'm not sure how to wrap my head around this one, conceptually. Any tips or pointers?

The code is below for reference.

Thank you!

*EDIT* For some reason I can't include the code here due to "max limit exceeded." I hope it isn't to much trouble to follow the link above. Sorry for that.

Replies(2)

tfguy44

Re: Help modifying existing code - Water simulation

6 months ago

That's actually a nice effect...

void newframe() {
//Toggle maps each frame
i=oldind;
oldind=newind;
newind=i;
i=0;
mapind=oldind;
for (int y=0;y<height;y++) {
for (int x=0;x<width;x++) {
short data = (short)((ripplemap[mapind-width]+ripplemap[mapind+width]+ripplemap[mapind-1]+ripplemap[mapind+1])>>1);
data -= ripplemap[newind+i];
data -= data >> 5;
ripplemap[newind+i]=data;
//where data=0 then still, where data>0 then wave
if ( data != 0 ) {
data = (short)(1024-data);
//offsets
a=((x-hwidth)*data/1024)+hwidth;
b=((y-hheight)*data/1024)+hheight;
//bounds check
if (a>=width) a=width-1;
if (a<0) a=0;
if (b>=height) b=height-1;
if (b<0) b=0;
ripple[i]=texture[a+(b*width)];
} else {
ripple[i]=color(0);
}
mapind++;
i++;
}
}
}

Just swap this function it for the similar one in the example you linked to.

amoeboar

Re: Help modifying existing code - Water simulation

6 months ago

That did the trick. Thank you!

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