Physics init

Author: sworleys

rectangles/Physics.java

@@ -0,0 +1,103 @@
+import processing.core.PApplet;
+
+public class Physics extends PApplet{
+	private static final float GRAV = (float) -9.8;
+	private float xPos;
+	private float yPos;
+	private float objWidth;
+	private float objHeight;
+	private float xV = 0;
+	private float yV = 0;
+	private float xA = 0;
+	private float yA = 0;
+
+	public Physics(float xPos, float yPos, float objWidth, float objHeight) {
+		this.xPos = xPos;
+		this.yPos = yPos;
+		this.objWidth = objWidth;
+		this.objHeight = objHeight;
+	}
+
+	public float updateY(float t) {
+		float accl = this.yA + GRAV;
+		this.yPos = (this.yPos + this.yV * t + (1/2) * accl * (t * t));
+		this.yV = this.yV + accl * t;
+
+		// Did I hit the floor/ceiling
+		if ((this.yPos + this.objHeight) > height) {
+			this.yPos = height - this.objHeight;
+		}
+		if (this.yPos > height) {
+			this.yPos = height;
+		}
+
+		return this.yPos;
+	}
+
+	public float updateX(float t) {
+		// TODO: Friction?
+		this.xPos = (this.xPos + this.xV * t + (1/2) * this.xA * (t * t));
+		this.xV = this.xV + this.xA * t;
+
+		// Did I hit the walls
+		if (this.xPos < 0) {
+			this.xPos = 0;
+			this.xA = this.xA * (-1);
+		}
+		if ((this.xPos + this.objWidth) > width) {
+			this.xPos = (width - this.objWidth);
+			this.yA = this.yA * (-1);
+		}
+
+		return this.xPos;
+	}
+
+	public float getxPos() {
+		return xPos;
+	}
+
+	public void setxPos(float xPos) {
+		this.xPos = xPos;
+	}
+
+	public float getyPos() {
+		return yPos;
+	}
+
+	public void setyPos(float yPos) {
+		this.yPos = yPos;
+	}
+
+	public float getxV() {
+		return xV;
+	}
+
+	public void setxV(float xV) {
+		this.xV = xV;
+	}
+
+	public float getyV() {
+		return yV;
+	}
+
+	public void setyV(float yV) {
+		this.yV = yV;
+	}
+
+	public float getxA() {
+		return xA;
+	}
+
+	public void setxA(float xA) {
+		this.xA = xA;
+	}
+
+	public float getyA() {
+		return yA;
+	}
+
+	public void setyA(float yA) {
+		this.yA = yA;
+	}
+
+}

rectangles/Rectangles.java

@@ -3,26 +3,78 @@
 import processing.core.PShape;
 
 public class Rectangles extends PApplet {
-	
-	private PShape square;
+
+	private ShapeObj square;
+	private ShapeObj rectangle;
 
 	public void settings() {
-		System.out.println(Test.testString);
-		size(500, 500);
-		//this.square = createShape(RECT, 0, 0, 50, 50);
-		//this.square.setFill(color(0, 0, 255));
-		//this.square.setStroke(false);
+		size(640, 360);
+	}
+
+	public void setup() {
+		background(0);
+		frameRate(60);
+		// Place square and rectangle in bottom corners of screen
+		this.square = new ShapeObj(50, 50, 0, height - 50);
+		this.rectangle = new ShapeObj(100, 50, this.width - 100, this.height - 50);
+
 	}
 
 	public void draw() {
-		rect(30, 20, 25, 25);
+		background(0);
+		this.square.update(1/60);
+		System.out.println("(" + this.square.py.getxPos() + ", " +
+				this.square.py.getyPos() + ")");
+	}
+
+	public void keyPressed() {
+		if (key == CODED) {
+			if (keyCode == LEFT) {
+				System.out.println("LEFT pressed");
+				this.square.py.setxA(-1);
+			}
+			if (keyCode == RIGHT) {
+				System.out.println("RIGHT pressed");
+				this.square.py.setxA(1);
+			}
+		}
+		if (key == ' ') {
+			System.out.println("SPACE pressed");
+			this.square.py.setyA(20);
+		}
 	}
 
-	//API stuff from https://happycoding.io/tutorials/java/processing-in-java
+	// API stuff from https://happycoding.io/tutorials/java/processing-in-java
 
 	public static void main(String[] args) {
 		String[] processingArgs = {"Rectangles"};
 		Rectangles sketch = new Rectangles();
 		PApplet.runSketch(processingArgs, sketch);
 	}
+
+	private class ShapeObj {
+		public Physics py;
+		public PShape shape;
+
+		public ShapeObj(float width, float height, float x, float y) {
+			this.py = new Physics(x, y, width, height);
+			this.shape = createShape(RECT, 0, 0, width, height);
+			this.shape.setFill(color(random(255), random(255), random(255)));
+			this.shape.setStroke(false);
+			shape(this.shape, x, y);
+		}
+
+		public void update(float t) {
+			this.py.updateX(t);
+			this.py.updateY(t);
+			shape(this.shape, this.py.getxPos(), this.py.getyPos());
+		}
+
+		public void setPos(float x, float y) {
+			this.py.setxPos(x);
+			this.py.setyPos(y);
+			shape(this.shape, x, y);
+		}
+		
+	}
 }