落下して弾むボール

Processing - 落下して弾むボール.java

import processing.core.*;

public class JiyuuRakka extends PApplet{
	final int MAX = 100;
	int idx = 0;
	Ball[] balls;
	static final long serialVersionUID = 100;
	float startx, starty
			, endx, endy;
	boolean isDragged = false;
	
	public void setup(){
		size(600, 400);
		balls = new Ball[MAX];
		frameRate(30);
		smooth();
		colorMode(HSB, 255);
		createColor(0, 0, 1, 255);
	}
	
	public void draw(){
		background(100);
		if (isDragged == true) {
			fill(255);
			ellipse(startx, starty, 10, 10);
			line(startx, starty, endx, endy);
		}
	
		for (int i = 0; i < MAX; i++) {
			if (balls[i] != null) {
				balls[i].update();
				fill(balls[i].Color);
				ellipse(balls[i].x, balls[i].y, balls[i].size, balls[i].size);
			}
		}
	}
	
	public void mousePressed() {
		startx = mouseX;
		starty = mouseY;
	}
	
	public void mouseDragged() {
		endx = mouseX;
		endy = mouseY;
		isDragged = true;
	}
	
	public void mouseReleased() {
		endx = mouseX;
		endy = mouseY;
		isDragged = false;

		float initialRateX = endx - startx;
		if (initialRateX != 0) {
			initialRateX = initialRateX / (float)10.0;
		}
		float initialRateY = endy - starty;
		if (initialRateY != 0)
		{
			initialRateY = initialRateY / (float)10;
		}

		balls[idx] = new Ball(startx, starty,random(10,15), this);
		balls[idx].setInitialSpeed(initialRateX, initialRateY);
		balls[idx].setColor(createColor(random(0,255), random(0,255), random(0,255), random(50,250)));

		idx++;
		if (MAX <= idx) {
			idx = 0;
		}
	}

	public int createColor(float c1, float c2, float c3, float c4) {
		return createColor((int)c1, (int)c2, (int)c3, (int)c4);
	}
	public int createColor(int c1, int c2, int c3)	{
		return createColor(c1, c2, c3, 255);
	}
	public int createColor(float c1, float c2, float c3)	{
		return createColor((int)c1, (int)c2, (int)c3);
	}
	public int createColor(int c1, int c2, int c3, int c4) {
		if (c1 < 0 || 255 < c1) {
			c1 = 255;
		}

		if (c2 < 0 || 255 < c2) {
			c2 = 255;
		}

		if (c3 < 0 || 255 < c3) {
			c3 = 255;
		}

		if (c4 < 0 || 255 < c4) {
			c4 = 255;
		}

		int _color = c4 << 24 | c1 << 16 | c2 << 8 | c3;
		return _color;
	}


}

import processing.core.*;

public class Ball {
  private
    float _x, _y;
    float _speedy, _speedx;
    float _size = 5;
    PApplet _p;
    int _color;
 
    static final float g = (float)2;
    
  public
    float x, y, size;
    int Color;
    
  Ball(float x, float y, float size, PApplet p){
    _x = x;
    _y = y;
    _size = size;
    _p = p;
    _speedy = 0;
  }
 
  public void setInitialSpeed(float speedx, float speedy) {
    _speedx = speedx;
    _speedy = speedy;
  }
  
  public void setColor(int c){
    _color = c;
    Color = _color;
  }
  
  public void update()
  {
    calculateXPos();
    calculateYPos();
    
    x = _x;
    y = _y;
    size = _size;
  }
  
  private void calculateXPos()
  {
    float x1;
    
    x1 = _x + _speedx;
    if (x1 <= size/2) {
      _speedx = (float) -1 * _speedx * (float)0.7;
      x1 = size / 2;
    } else if ((_p.width - size /2) <= x1){
      _speedx = (float) -1 * _speedx * (float)0.7;
      x1 = _p.width - size / 2;
    }
    _x = x1;
  }
  
  private void calculateYPos()
  {
    float y1;
    
    _speedy += g ;
    y1 = _y + _speedy;
    if ((_p.height - size/2) <= y1) {
      _speedy = (float) -1 * _speedy * (float)0.7;
      y1 = _p.height - size / 2;
      _speedx = _speedx * (float)0.95;
    }
    
    _y = y1;
  }
}