Android Open Source - Canvas-Test Example Scene

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Back to project page Canvas-Test.

License

The source code is released under:

Apache License

Java Source Code

package foobar.canvastest.drawing.scenes;
/*w  w w  .ja  v  a 2 s.co m*/
import android.graphics.Canvas;
import android.graphics.Paint;
import foobar.canvastest.drawing.Drawable;

/**
 * An example of a scene you can draw. Although some android projects like to put
 * this code in the SurfaceView, for me it is convenient to put all the drawing 
 * code in its own class. It hides all that boilerplate code, and gives the added
 * bonus of being able to switch out the scene being drawn while reusing the same view.
 * 
 * To make your own scene, create a new class that implements Drawable. Do what you need
 * to in the draw() method to produce your image. To put your picture or animation on
 * to the screen, call 
 * yourMySurfaceViewInstance.setScene(new YourSceneClass());
 * 
 * You can do this, for example, when a button is clicked, or, for simplicity, when the 
 * surface is created by MainCanvasActivity.
 */
public class ExampleScene implements Drawable {
  //A few "paint brushes" to draw with
  private Paint mPaint1 = new Paint();
  private Paint mPaintText = new Paint();
  private Paint mPaintBg = new Paint();

  /**
   * Create the drawing.
   */
  public void draw(Canvas c) {
    //Save the basic matrix state. This is the state of all rotations, translations, scale operations, etc.
    c.save();

    c.drawColor(0xff000000);

    //Draw a blue background
    c.drawPaint(mPaintBg);

    c.drawText("Hello Drawing!", 20f, 100f, mPaintText);

    c.drawLine(100, 200, 200, 350, mPaint1);
    c.drawLine(100, 350, 200, 200, mPaint1);

    //Restore the basic matrix state.
    c.restore();
  }

  public ExampleScene() {
    //Initialize paint styles
    mPaintText.setColor(0xffffffff);
    mPaintText.setAntiAlias(true);
    mPaintText.setStrokeWidth(1);
    mPaintText.setStrokeCap(Paint.Cap.ROUND);
    mPaintText.setStyle(Paint.Style.FILL_AND_STROKE);
    mPaintText.setTextAlign(Paint.Align.LEFT);
    mPaintText.setTextSize(50);

    mPaint1.setColor(0xbb33bbff);
    mPaint1.setAntiAlias(true);
    mPaint1.setStrokeWidth(10);
    mPaint1.setStrokeCap(Paint.Cap.ROUND);
    mPaint1.setStyle(Paint.Style.FILL_AND_STROKE);

    mPaintBg.setColor(0x990099ff);
  }
}

Java Source Code List

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