I don't want to keep writing the same code over and over.

I have written generic Point classes, line/line intersection algorithms and Layer administration code more times than I can remember. I don't like menial programming, so this is effectively my code library. But you can use it too!

The language used is Processing, which is a mostly-Java-syntax language. I hardly ever use Java-specific ninja code, so rewriting any of these snippets to your favourite language is less than a minute's worth of work, typically.

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// REQUIRES: skeleton.pde
// REQUIRES: Movable.pde

/**
 * Demonstrator class for the skeleton.
 * we're modelling a rectangular thing.
 */
class Demonstrator extends Movable {
  // width and height
  Point dims;
  // rectangular thing
  Demonstrator(float x, float y, float w, float h) { super(x,y); dims = new Point(w,h); }
  // draw rectangle!
  void draw() { fill(255,0,0,30); stroke(0); rect(getX(), getY(), dims.x, dims.y); drawPoints(); }
  // standard rectangular bounds check
  boolean over(float x, float y) { return getX() <= x && x <= getX() + dims.x && getY() <= y && y <= getY() + dims.y; }
}

/**
 * set up several demonstrator things
 */
void setupAdditional() {
  for(int i=0; i<20; i++) {
    Demonstrator d = new Demonstrator(getCoordinate(), getCoordinate(), getDimension(), getDimension());
    addDrawable(d);
  }
}

// random coordinate generator
float getCoordinate() { return random(40,width-80); }

// random dimension generator
float getDimension() { return random(40,80); }

// No additional things to draw
void drawAdditional() {}

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Written and maintained by Mike "Pomax" Kamermans. All code snippets on this site are "do whatever you want with it" licensed.