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https://github.com/processing/processing4.git
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50 lines
1.4 KiB
Plaintext
50 lines
1.4 KiB
Plaintext
/**
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* Brightness
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* by Daniel Shiffman.
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*
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* Adjusts the brightness of part of the image
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* Pixels closer to the mouse will appear brighter.
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*/
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PImage img;
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void setup() {
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size(200, 200);
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frameRate(30);
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img = loadImage("wires.jpg");
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img.loadPixels();
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// Only need to load the pixels[] array once, because we're only
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// manipulating pixels[] inside draw(), not drawing shapes.
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loadPixels();
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}
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void draw() {
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for (int x = 0; x < img.width; x++) {
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for (int y = 0; y < img.height; y++ ) {
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// Calculate the 1D location from a 2D grid
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int loc = x + y*img.width;
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// Get the R,G,B values from image
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float r,g,b;
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r = red (img.pixels[loc]);
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//g = green (img.pixels[loc]);
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//b = blue (img.pixels[loc]);
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// Calculate an amount to change brightness based on proximity to the mouse
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float maxdist = 50;//dist(0,0,width,height);
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float d = dist(x,y,mouseX,mouseY);
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float adjustbrightness = 255*(maxdist-d)/maxdist;
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r += adjustbrightness;
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//g += adjustbrightness;
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//b += adjustbrightness;
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// Constrain RGB to make sure they are within 0-255 color range
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r = constrain(r,0,255);
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//g = constrain(g,0,255);
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//b = constrain(b,0,255);
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// Make a new color and set pixel in the window
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//color c = color(r,g,b);
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color c = color(r);
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pixels[y*width + x] = c;
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}
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}
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updatePixels();
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}
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