ImageRect (goes with BouncingImages2)

package bouncer2;
import java.awt.Color;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;


//NOTE: This class requires BouncingImages.java

/* This class combines an image with a rectangle
 * which allows for easy movement and collision detection
 */
class ImageRect extends Rectangle{
    //this gives it an x,y,width,height

    static int biggestDim = 0;

    BufferedImage image;
    Color color = Color.RED;
    //these are the speeds of movement
    int vx=1;
    int vy=1;
    int lastx=-1;
    int lasty=-1;

    Point ctr, tl, tr, bl, br, ml, mr,mt, mb;

    ImageRect(String filename) {

        vx = (int)(Math.random()*3+1);

        //load the image
        try {
            image = ImageIO.read(new File(filename));
            width = image.getWidth(null);
            height = image.getHeight(null);
        } catch (IOException e) {
            System.out.println("ERROR: image file \"" + filename + "\" not found");
            //e.printStackTrace();
            BouncingImages2.imagesLoaded = false;
            width = 100 + (int)(Math.random()*100);
            height= width - (int)(Math.random()*70);
            color = Color.getHSBColor ((float) Math.random (), 1.0f, 1.0f);    // a quick way to get random colours
            //System.exit(0);
        }

        //update the variable containing the biggest dimension
        if (width > biggestDim) biggestDim = width;
        if (height > biggestDim) biggestDim = height;

        calculatePoints();
    }

    void calculatePoints() {
        //Calculate points
        //corners
        tl = new Point(x,y);
        tr = new Point(x+width,y);
        bl = new Point(x,y+height);
        br = new Point(x+width,y+height);
        //center
        ctr = new Point(x+width/2, y+ height/2);
        //mid points of sides
        ml = new Point(x, y+ height/2);
        mr = new Point(x+width, y+height/2);
        mt = new Point(x+width/2,y);
        mb = new Point(x+width/2,y+height);
    }

    void moveImage(){
        lastx = x;
        lasty = y;
        x += vx;
        y += vy;
        if (x < 0 && vx < 0) {
            x = 0;
            vx = -vx;
        }
        if (y < 0 && vy < 0) {
            y = 0;
            vy = -vy;
        }
        if(x + width > BouncingImages2.WINW && vx > 0) {
            x = BouncingImages2.WINW-width;
            vx = -vx;
        }
        if(y + height > BouncingImages2.WINH && vy > 0) {
            y = BouncingImages2.WINH-height;
            vy = -vy;
        }
    }

    void undoMove() {
        if (lastx > 0) {
            x = lastx;
            y = lasty;
        }
        lastx = lasty = -1;
    }
}