Introduce Sprite

Base on last post Create transparent foreground SurfaceView, the object on foreground was draw as a bitmap. We are going to implement a Sprite class here. Sprite object keep it's own status such as location(x, y) and bitmap, and also draw itself on canvas.

Add class Sprite.java

package com.MyGame;

import android.graphics.Bitmap;
import android.graphics.Canvas;

public class Sprite {
private Bitmap bitmap;
private int x;
private int y;
float bitmap_halfWidth, bitmap_halfHeight;

public Sprite(Bitmap bm, int tx, int ty){
 bitmap = bm;
 x = tx;
 y = ty;
 bitmap_halfWidth = bitmap.getWidth()/2;
 bitmap_halfHeight = bitmap.getHeight()/2;
}

public void setX(int tx){
 x = tx;
}

public void setY(int ty){
 y = ty;
}

public int getX(){
 return x;
}

public int getY(){
 return y;
}

public void draw(Canvas canvas){
 canvas.drawBitmap(bitmap, x-bitmap_halfWidth, y-bitmap_halfHeight, null);
}

}

Modify MyForeground.java

package com.MyGame;

import android.content.Context;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.util.AttributeSet;

public class MyForeground extends MyGameSurfaceView {

Sprite mySprite;

public MyForeground(Context context) {
 super(context);
 init();
}

public MyForeground(Context context, AttributeSet attrs) {
 super(context, attrs);
 init();
}

public MyForeground(Context context, AttributeSet attrs, int defStyle) {
 super(context, attrs, defStyle);
 init();
}

private void init(){
 mySprite = new Sprite(
   BitmapFactory.decodeResource(getResources(), R.drawable.icon_me),
   100, 100);
}

@Override
protected void onDraw(Canvas canvas) {
 mySprite.draw(canvas);
}

}

Next:
- Sprite auto-run

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