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Removing Topics from SVN
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@@ -1,52 +0,0 @@
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/**
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* ArrayList of objects
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* by Daniel Shiffman.
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*
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* This example demonstrates how to use a Java ArrayList to store
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* a variable number of objects. Items can be added and removed
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* from the ArrayList.
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*
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* Click the mouse to add bouncing balls.
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*/
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ArrayList balls;
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int ballWidth = 48;
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void setup() {
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size(640, 360);
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smooth();
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noStroke();
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// Create an empty ArrayList
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balls = new ArrayList();
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// Start by adding one element
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balls.add(new Ball(width/2, 0, ballWidth));
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}
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void draw() {
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background(255);
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// With an array, we say balls.length, with an ArrayList, we say balls.size()
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// The length of an ArrayList is dynamic
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// Notice how we are looping through the ArrayList backwards
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// This is because we are deleting elements from the list
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for (int i = balls.size()-1; i >= 0; i--) {
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// An ArrayList doesn't know what it is storing so we have to cast the object coming out
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Ball ball = (Ball) balls.get(i);
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ball.move();
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ball.display();
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if (ball.finished()) {
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// Items can be deleted with remove()
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balls.remove(i);
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}
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}
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}
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void mousePressed() {
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// A new ball object is added to the ArrayList (by default to the end)
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balls.add(new Ball(mouseX, mouseY, ballWidth));
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}
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@@ -1,50 +0,0 @@
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// Simple bouncing ball class
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class Ball {
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float x;
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float y;
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float speed;
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float gravity;
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float w;
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float life = 255;
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Ball(float tempX, float tempY, float tempW) {
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x = tempX;
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y = tempY;
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w = tempW;
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speed = 0;
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gravity = 0.1;
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}
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void move() {
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// Add gravity to speed
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speed = speed + gravity;
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// Add speed to y location
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y = y + speed;
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// If square reaches the bottom
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// Reverse speed
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if (y > height) {
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// Dampening
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speed = speed * -0.8;
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y = height;
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}
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}
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boolean finished() {
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// Balls fade out
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life--;
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if (life < 0) {
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return true;
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} else {
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return false;
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}
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}
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void display() {
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// Display the circle
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fill(0,life);
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//stroke(0,life);
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ellipse(x,y,w,w);
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}
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}
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