Hello I am trying to sample pixels off the drawing I am making for use with collision detection, and I cant figure out a way to do it.
ofSetColor(255, 255, 255);
ofSetColor(0, 0, 0);
ofRect(20, 20, 100, 100);
// would sample a pixel at x, y position of the mouse here and see if it's black
Is there any way to do this?
Are there any examples of accessing that info? Right now I am copying the screen to an ofImage (just white at the moment) and am getting strange values:
// sample color from drawing here
screenImage.grabScreen( 0, 0, ofGetScreenWidth(), ofGetScreenHeight() );
unsigned char *pixels = screenImage.getPixels();
int widthOfLine = ofGetScreenWidth();
int mod = round(touchXPos * touchYPos);
int r = pixels[mod * 0];
int g = pixels[mod * 1];
int b = pixels[mod * 2];
printf("r: %d g: %d b: %d \n", r, g, b);