circles.pde

import processing.core.PApplet;
import processing.core.PGraphics;

/**
 * Created by cbrowning on 2/17/16.
 */
public class ProcessingExample extends PApplet{

    PGraphics tile;
    int tileWidth;
    int tileHeight;

    public void settings() {
        // settings method (because you can't set size(int, int)
        // when not in the Processing IDE
        size(720,480);

    }

    public void setup(){
        // setup method
        frameRate(60);
        tileWidth = 15;
        tileHeight = 15;

        tile = createGraphics(tileWidth,tileHeight);
    }

    // handy reference:
    // https://processing.org/tutorials/rendering/
    public void renderTile(){
        tile.beginDraw();
        tile.noStroke();
        tile.background(255);
        tile.fill(0);

        // first circle
        float x = tileWidth/2.0f+cos((float)frameCount/10.0f)*tileWidth/2.0f;
        float y = tileHeight/2.0f+sin((float)frameCount/10.0f)*tileHeight/2.0f;

        float circleSize = 5.0f;
        tile.ellipse(x,y, circleSize,circleSize);

        // second circle
        x = tileWidth/2.0f+cos((float)(frameCount+30)/10.0f)*tileWidth/2.0f;
        y = tileHeight/2.0f+sin((float)(frameCount+20)/10.0f)*tileHeight/2.0f;

        circleSize = 5.0f;
        tile.ellipse(x,y, circleSize,circleSize);

        tile.endDraw();
    }

    public void draw() {
        background(255);
        renderTile();

        for(int i=0; i<height/tileHeight;i++){
            for(int j=0;j<width/tileWidth;j++){
                pushMatrix();
                noTint();
                translate(j*tileWidth,i*tileHeight);
                if(j%2 == 0){
                  //   tint(255,64,192); // handy for seeing whats going on
                    translate(tileWidth,0);
                    scale(-1.0f,1.0f);
                }
                if(i%2 == 0){
                   //  tint(192,212,0); // handy for seeing whats going on
                    translate(0,tileHeight);
                    scale(1.0f,-1.0f);

                }
                image(tile,0,0);
                popMatrix();

            }
        }

        // for export
        if((float)frameCount/10.0f < TWO_PI){
            saveFrame("processingexample.jpg");
        }

    }

    // IDE necessities
    static public void main(String args[]) {
        PApplet.main(new String[] { "ProcessingExample" });
    }

}