Question

I’m trying to make a simple game (such as Arkanoid) on Android.

I used some elements from ping-pong-game pattern which I found on the internet.

So I was trying to change this class (GameObject) by using Bitmap instead of Drawable, but some problems appeared.

I have got some questions:

1. The Rect object which I’ve got here used like field with it own resolution so how can make something like this using Bitmap?
2. Is something like .getBounds() exist for Bitmap?
3. Can I make animated objects (blinking, change colour and e.t.c) somehow with Drawable or Bitmap is better for animation?

Here’s my code:

package project.java.game.objects;

import android.graphics.Canvas;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;

public abstract class GameObject {

    // Directions
    public final static int DIR_LEFT = -1;
    public final static int DIR_RIGHT = 1;
    public final static int DIR_NONE = 0;
    public final static int DIR_UP = 1;
    public final static int DIR_DOWN = -1;


    /** Higer border of object */
    public int getTop() { return mPoint.y; }

    /** Lower border */
    public int getBottom() { return mPoint.y + mHeight; }

    /** Left border */
    public int getLeft() { return mPoint.x; }

    /** right border */
    public int getRight() { return mPoint.x + mWidth; }

    public int returnCenter(){ return mPoint.x + mWidth/2; }

    /** Central point */
    public Point getCenter() { return new Point(mPoint.x + mWidth / 2, mPoint.y + mHeight / 2); }

    /** Height of object */
    public int getHeight() { return mHeight; }

    /** Width */
    public int getWidth() { return mWidth; }

    /** @return Recatngle, which is limit objects */
    public Rect getRect() { 
        return mImage.getBounds(); 
    }

    /** for intersection */
    public static boolean intersects(GameObject obj1, GameObject obj2)
    {
        return Rect.intersects(obj1.getRect(), obj2.getRect());
    }


    /** for coordinates */
    protected Point mPoint;

    /** Height of image */
    protected int mHeight;

    /** Width */
    protected int mWidth;

    /** image */
    private Drawable mImage;

    /** speed */
    protected int mSpeed;

    /**Life level*/
    protected int mLifeLvl;

    /**
     * Constructor
     * @param image image which will use for object
     */
    public GameObject(Drawable image)
    {
        mImage = image;
        mPoint = new Point(0, 0);
        mWidth = image.getIntrinsicWidth();
        mHeight = image.getIntrinsicHeight();
    }

    /** point change position  */
    protected abstract void updatePoint();

    /** object change position */
    public void update()
    {
        updatePoint();
        mImage.setBounds(mPoint.x, mPoint.y, mPoint.x + mWidth, mPoint.y + mHeight);
    }

    /**to draw object */
    public void draw(Canvas canvas)
    {
        mImage.draw(canvas);
    }
    /** set Left bound */
    public void setLeft(int value) { mPoint.x = value; }

    /** set Right bound  */
    public void setRight(int value) { mPoint.x = value - mWidth; }

    /** set top bound */
    public void setTop(int value) { mPoint.y = value; }

    /** set Lower bound */
    public void setBottom(int value) { mPoint.y = value - mHeight; }

    /** center of object on OX */
    public void setCenterX(int value) { mPoint.x = value - mHeight / 2; }

    /** center of object on OY */
    public void setCenterY(int value) { mPoint.y = value - mWidth / 2; }
}

Answer 1

To get bitmap’s dimension use the getWidth() and getHeight() methods.

Bitmap b = MediaStore.Images.Media.getBitmap(getContentResolver(), imageUri);
int width = b.getWidth();
int height = b.getHeight();  

To create bitmap from a bitmap of desired dimension, use the createScaledBitmap method of the Bitmap class

Bitmap newBitmap  = Bitmap.createScaledBitmap(b, width, height, false);

You can use the Android Animation class to apply animation on bitmap through layout. Available in the APIDemos application. (ApiDemos->Views->Animation->3D Transition)