com.google.gwt.sample.guestbook.client.CanvasRandom.java Source code

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Here is the source code for com.google.gwt.sample.guestbook.client.CanvasRandom.java

Source

package com.google.gwt.sample.guestbook.client;

import com.google.gwt.user.client.Random;

public class CanvasRandom extends CanvasCustom {
    /**
     * @param canvas
     */
    public CanvasRandom() {
        //        super( canvas );
        x = WIDTH / 2;
        y = HEIGHT / 2;
    }

    /* (non-Javadoc)
     * @see com.google.gwt.sample.guestbook.client.CanvasExt#updateCanvas()
     */
    @Override
    public void updateCanvas() {
        context.beginPath();
        randomIncrementColour();
        context.setStrokeStyle(colour);
        context.moveTo(x, y);
        randomUpdateCoord();
        context.lineTo(x, y);
        context.stroke();
        context.closePath();
    }

    private void randomUpdateCoord() {
        x = x + (Random.nextInt(coordVector) - (COLOUR_INCREMENT_VECTOR / 2));
        if (x < 0) {
            x = 0;
        } else if (x > WIDTH) {
            x = WIDTH;
        }

        y = y + (Random.nextInt(coordVector) - (COLOUR_INCREMENT_VECTOR / 2));
        if (y < 0) {
            y = 0;
        } else if (y > WIDTH) {
            y = WIDTH;
        }
    }
}