FaceExample

FaceExample.java

import acm.program.*;
 
public class FaceExample extends GraphicsProgram {
 
	public void run() {
		GFace face = new GFace(100, 150);
		add(face, getWidth() / 2, getHeight() / 2);
 
		face.move(20, 0);
	}
 
	private static final long serialVersionUID = 1;
}

GFace.java

import acm.graphics.*;
 
public class GFace extends GCompound {
 
	/** Construct a new GFace object with the specified dimensions */
	public GFace(double width, double height) {
		head = new GOval(width, height);
		leftEye = new GOval(EYE_WIDTH * width, EYE_HEIGHT * height);
		rightEye = new GOval(EYE_WIDTH * width, EYE_HEIGHT * height);
		nose = createNose(NOSE_WIDTH * width, NOSE_HEIGHT * height);
		mouth = new GRect(MOUTH_WIDTH * width, MOUTH_HEIGHT * height);
 
		add(head, -width / 2, -height / 2);
		add(leftEye, -0.25 * width - EYE_WIDTH * width / 2,
					 -0.25 * height - EYE_HEIGHT * height / 2);
		add(rightEye, 0.25 * width - EYE_WIDTH * width / 2,
					 -0.25 * height - EYE_HEIGHT * height / 2);
		add(nose, 0, 0);
		add(mouth, -MOUTH_WIDTH * width / 2,
				   0.25 * height - MOUTH_HEIGHT * height / 2);
	}
 
	/* Creates a triangle for the nose */
	private GPolygon createNose(double width, double height) {
		GPolygon poly = new GPolygon();
		poly.addVertex(0, -height / 2);
		poly.addVertex(width / 2, height / 2);
		poly.addVertex(-width / 2, height / 2);
		return poly;
	}
 
	/* Constants specifying feature size as a fraction of the head size */
	private static final double EYE_WIDTH 	= 0.15;
	private static final double EYE_HEIGHT	= 0.15;
	private static final double NOSE_WIDTH	= 0.15;
	private static final double NOSE_HEIGHT	= 0.15;
	private static final double MOUTH_WIDTH	= 0.50;
	private static final double MOUTH_HEIGHT = 0.03;
 
	/* Private instance variables */
	private GOval head;
	private GOval leftEye, rightEye;
	private GPolygon nose;
	private GRect mouth;
}