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ae7b1ad056
processing-js 0.4 has been merged in some relevant parts basic and topic scripts added for test color handling fixed, more scripts show up now
66 lines
1.9 KiB
Plaintext
66 lines
1.9 KiB
Plaintext
PImage img;
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int w = 10;
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// It's possible to convolve the image with
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// many different matrices
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float[][] matrix = { { -1, -1, -1 },
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{ -1, 9, -1 },
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{ -1, -1, -1 } };
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void setup() {
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size(33, 22);
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frameRate(30);
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img = loadImage("data/cait.jpg");
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}
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void draw() {
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// We're only going to process a portion of the image
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// so let's set the whole image as the background first
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image(img,0,0);
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// Where is the small rectangle we will process
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int xstart = constrain(mouseX-w/2,0,img.width);
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int ystart = constrain(mouseY-w/2,0,img.height);
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int xend = constrain(mouseX+w/2,0,img.width);
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int yend = constrain(mouseY+w/2,0,img.height);
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int matrixsize = 3;
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loadPixels();
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// Begin our loop for every pixel
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for (int x = xstart; x < xend; x++) {
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for (int y = ystart; y < yend; y++ ) {
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color c = convolution(x,y,matrix,matrixsize,img);
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int loc = x + y*img.width;
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pixels[loc] = c;
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}
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}
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updatePixels();
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}
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color convolution(int x, int y, float[][] matrix,int matrixsize, PImage img)
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{
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float rtotal = 0.0;
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float gtotal = 0.0;
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float btotal = 0.0;
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int offset = matrixsize / 2;
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for (int i = 0; i < matrixsize; i++){
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for (int j= 0; j < matrixsize; j++){
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// What pixel are we testing
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int xloc = x+i-offset;
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int yloc = y+j-offset;
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int loc = xloc + img.width*yloc;
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// Make sure we haven't walked off our image, we could do better here
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loc = constrain(loc,0,img.pixels.length-1);
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// Calculate the convolution
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rtotal += (red(img.pixels[loc]) * matrix[i][j]);
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gtotal += (green(img.pixels[loc]) * matrix[i][j]);
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btotal += (blue(img.pixels[loc]) * matrix[i][j]);
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}
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}
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// Make sure RGB is within range
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rtotal = constrain(rtotal,0,255);
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gtotal = constrain(gtotal,0,255);
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btotal = constrain(btotal,0,255);
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// Return the resulting color
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return color(rtotal,gtotal,btotal);
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}
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