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Color of a screen pixel: Difference between revisions
Add Processing
(Add SmileBASIC implementation) |
(Add Processing) |
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=={{header|Processing}}==
Access any pixel value on the sketch canvas. A color in Processing is a 32-bit int, organized in four components, alpha red green blue, as AAAAAAAARRRRRRRRGGGGGGGGBBBBBBBB. Each component is 8 bits (a number between 0 and 255), and can be accessed with alpha(), red(), green(), blue().
<lang processing>void draw(){
color c = get(mouseX,mouseY);
println(c, red(c), green(c), blue(c));
}</lang>
For greater speed, pixels may be looked up by index in the pixels[] array, and color components may be retrieved by bit-shifting.
<lang processing>void draw(){
loadPixels();
color c = pixels[mouseY * width + mouseX];
println(c, c >> 16 & 0xFF, c >> 8 & 0xFF, c >> 8 & 0xFF);
}</lang>
=={{header|PureBasic}}==
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