市松模様を出力するprocessing sketch

checkers.pde

// Checkers
// bult with Processing
// Jan 27 2009
// by VoQn

color[] colors = new color[ 4];
Checker checker;

void setup(){
  size(400,800);
  colorMode(HSB,360,100,100,100);
  smooth();

  noLoop();
  
  // Setup Color Array
  colors[0] = color(0,30,20);
  colors[1] = color(0,20,10);
  colors[2] = color(10,30,10);
  colors[3] = color(10,20,20);
  
  // Test Perameter
  float X = float(width/40);
  float Y = float(height/40);
  float Width = float(width*38/40);
  float Height = float(height*38/40);
  int Xnum = 15;
  int Ynum = 31;
  float marginX = 2;
  float marginY = 2;

  checker = new Checker(X, Y, Width, Height, Xnum, Ynum, marginX, marginY);
}

void draw(){
  background(0,0,0);
  checker.drawRects();
  checker.drawEllipses();
}

// generate checker class
class Checker {
  float x,y;
  float dx,dy;
  float selWidth, selHeight;
  float chWidth, chHeight;
  float marginX,marginY;
  int numXLine,numYLine;
  int selCount = 0;

  Checker(float _x, float _y, float _width, float _height, int numx, int numy, float marginx, float marginy){

    chWidth = _width;
    chHeight = _height;

    numXLine = numx;
    numYLine = numy;
    
    marginX = marginx;
    marginY = marginy;

    selWidth = (chWidth + marginX*(numXLine-1)) / numXLine; // chWidth = selWidth * numXLine + marginX*(numXLine-1);
    selHeight = (chHeight + marginY*(numYLine-1)) / numYLine; // chHeight = selHeight * numYLine + marginY*(numYLine-1);

    dx = selWidth + marginX;
    dy = selHeight + marginY;

    x = _x;
    y = _y;
  }

  int fix(int num){
    if(num%2 == 1){
      return num;
    }
    else{
      return num+1;
    }
  }

  void drawRects(){
    float tmpX, tmpY;
    tmpX = x + selWidth/2;
    tmpY = y + selHeight/2;
    selCount = 0;
    while(tmpY-marginY < y+chHeight){

      noStroke();
      if(selCount%2 == 0){
        fill(colors[0]);
      }
      else {
        fill(colors[1]);
      }
      rectMode(CENTER);
      rect(tmpX,tmpY,selWidth,selHeight);
      tmpX += dx;
      if(tmpX-marginX > X+chWidth){
        tmpX = x + selWidth/2;
        tmpY += dy;
      }
      selCount += 1;
    }
  }

  void drawEllipses(){
    float tmpX, tmpY;
    tmpX = x + selWidth/2;
    tmpY = y + selHeight/2;
    selCount = 0;
    while(tmpY-marginY < y+chHeight){

      noStroke();
      if(selCount%2 == 0){
        fill(colors[2]);
      }
      else {
        fill(colors[3]);
      }
      ellipseMode(CENTER);
      ellipse(tmpX,tmpY,selWidth*99/100,selHeight*99/100);
      tmpX += dx;
      if(tmpX > x+chWidth){
        tmpX = x + selWidth/2;
        tmpY += dy;
      }
      selCount += 1;
    }
  }
}