[英]Full screen image using canvas and bitmap
我正在尝试使用画布和位图在全屏模式下设置图像,但是每当我加载该应用程序时,图像都会被放大,并且仅显示其应有的一半。 我该怎么做? 我已附上我的代码段,并尝试更新onDraw方法中的canvas.drawbitmap行的代码,但它无济于事,图像仍会放大显示。有些帮助将不胜感激,谢谢您提前...
public class Fish extends View {
private Bitmap fish [] =new Bitmap[2];
private int fishX=10;
private int fishY;
private int fishSpeed;
private int canvasWidth, canvasHeight;
private int yellowX, yellowY, yellowSpeed=16;
private Paint yellowPaint=new Paint();
private int greenX, greenY, greenSpeed=20;
private Paint greenPaint=new Paint();
private int redX, redY, redSpeed=25;
private Paint redPaint=new Paint();
private int score, lifeCountOfLife;
private boolean touch=false;
private Bitmap backgroundImage;
private Paint scorePaint= new Paint();
private Bitmap life[]=new Bitmap[2];
//updates the background
public Fish(Context context) {
super(context);
fish [0]=BitmapFactory.decodeResource(getResources(),R.drawable.fish1);
fish [1]=BitmapFactory.decodeResource(getResources(),R.drawable.fish2);
//updates the bg
backgroundImage=BitmapFactory.decodeResource(getResources(),R.drawable.mn);
//creates the ball/foood color
yellowPaint.setColor(Color.YELLOW);
yellowPaint.setAntiAlias(false);
greenPaint.setColor(Color.GREEN);
greenPaint.setAntiAlias(false);
redPaint.setColor(Color.RED);
redPaint.setAntiAlias(false);
// updates score
scorePaint.setColor(Color.WHITE);
scorePaint.setTextSize(70);
scorePaint.setTypeface(Typeface.DEFAULT_BOLD);
scorePaint.setAntiAlias(true);
//displays the heart and life
life[0]=BitmapFactory.decodeResource(getResources(),R.drawable.heartts);
life[1]=BitmapFactory.decodeResource(getResources(),R.drawable.greyheart);
fishY=550;
score=0;
lifeCountOfLife=3;
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvasWidth=canvas.getWidth();
canvasHeight=canvas.getHeight();
//displays it to the main actiivty
canvas.drawBitmap(backgroundImage,canvasWidth,canvasHeight,null);
int minFish= fish[0].getHeight();
int maxFishY=canvasHeight-fish[0].getHeight() *3;
fishY=fishY+fishSpeed;
if(fishY<minFish){
fishY=minFish;
}
if(fishY> maxFishY){
fishY=maxFishY;
}
fishSpeed=fishSpeed+2;
if(touch){
canvas.drawBitmap(fish[1], fishX,fishY, null);
touch=false;
}else{
canvas.drawBitmap(fish[0],fishX,fishY,null);
}
yellowX=yellowX-yellowSpeed;
//updates the score if the ball is collected
if(hitBallChecker(yellowX,yellowY)){
score=score+10;
yellowX=-100;
}
if(yellowX<0){
yellowX=canvasWidth+21;
yellowY=(int) Math.floor(Math.random() * (maxFishY-minFish))+ minFish;
}
//increases size of ball
canvas.drawCircle(yellowX, yellowY, 25, yellowPaint);
//Green ball
greenX=greenX-greenSpeed;
if(hitBallChecker(greenX,greenY)){
score=score+20;
greenX=-100;
}
if(greenX<0){
greenX=canvasWidth+21;
greenY=(int) Math.floor(Math.random() * (maxFishY-minFish))+ minFish;
}
//increases size of ball
canvas.drawCircle(greenX, greenY, 25, greenPaint);
//red ball
//if the ball gets hit
redX=redX-redSpeed;
if(hitBallChecker(redX,redY)){
redX=-100;
lifeCountOfLife--;
if(lifeCountOfLife==0){
Intent gameOverIntent= new Intent(getContext(), GameOverActivity.class);
gameOverIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
gameOverIntent.putExtra("score", score);
getContext().startActivity(gameOverIntent);
}
}
//increases size of ball
if(redX<0){
redX=canvasWidth+21;
redY=(int) Math.floor(Math.random() * (maxFishY-minFish))+ minFish;
}
canvas.drawCircle(redX, redY, 30, redPaint);
canvas.drawText("Score: " +score, 20, 60, scorePaint);
for(int i=0; i<3; i++){
int x=(int) (580+life[0].getWidth() * 1.5 * i);
int y=30;
if(i<lifeCountOfLife){
canvas.drawBitmap(life[0], x,y, null);
}else{
canvas.drawBitmap(life[1], x,y, scorePaint);
}
}
}
public boolean hitBallChecker(int x, int y){
if(fishX< x && x<(fishX+fish[0].getWidth()) &&fishY<y &&y<(fishY+ fish[0].getHeight())){
return true;
}
return false;
}
//updates fish speed
@Override
public boolean onTouchEvent(MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_DOWN){
touch=true;
fishSpeed=-22;
}
return true;
}
}
public void drawBitmap (Bitmap bitmap,
float left,
float top,
Paint paint)
在drawBitmap
左上角和顶部,定义图像左上角的(x,y),在您的情况下应为(0,0)。
如果要绘制canvas
大小的背景,最好使用:
public void drawBitmap (Bitmap bitmap,
Rect src,
Rect dst,
Paint paint)
其中src
是Rect
,它定义要绘制的Bitmap
的子集(可以将其保留为null以绘制整个Bitmap
),而dst
是目标Rect
,它将自动用Bitmap
填充。
您将需要定义目标Rect
:
Rect backgroundRect = new Rect(0, 0, canvas.getWidth(), canvas.getHeight());
您现在可以打电话
canvas.drawBitmap(backgroundImage,null,backgroundRect,null);
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