android 基本的畫圖方法

//畫布繪圖的一些應用
  //畫一個點
        Paint paint=new Paint();
        paint.setColor(Color.BLUE);
        paint.setStrokeWidth(100);//設置點的寬度
        Canvas canvas=new Canvas(bitmap);
        canvas.drawPoint(100, 100, paint);
        chooseView.setImageBitmap(bitmap);
       //畫一條直線
        Paint paint=new Paint();
        paint.setColor(Color.BLUE);
        paint.setStrokeWidth(10);//設置點的寬度
        float startX=10;
        float startY=20;
        float stopX=100;
        float stopY=200;
        Canvas canvas=new Canvas(bitmap);
        canvas.drawLine(startX, startY, stopX, stopY, paint);
        chooseView.setImageBitmap(bitmap);
        
        //畫一個矩形
        Paint paint=new Paint();
        paint.setColor(Color.GRAY);
        paint.setStrokeWidth(10);
        paint.setStyle(Paint.Style.FILL_AND_STROKE);
        Canvas canvas=new Canvas(bitmap);
        int left=10;
        int top=10;
        int right=100;
        int bottom=100;
        Rect rect=new Rect(left, top, right, bottom);
        canvas.drawRect(rect, paint);
//        canvas.drawRect(left, top, right, bottom, paint);
       chooseView.setImageBitmap(bitmap);
       //橢圓
        Paint paint=new Paint();
        paint.setColor(Color.RED);
        paint.setStyle(Paint.Style.STROKE);
        int left=10;
        int top=20;
        int right=60;
        int bottom=100;
        RectF oval=new RectF(left, top, right, bottom);
        Canvas canvas=new Canvas(bitmap);
        canvas.drawOval(oval, paint);
        chooseView.setImageBitmap(bitmap);
        
        
        //圓
        Paint paint=new Paint();
        paint.setColor(Color.BLACK);
        paint.setStyle(Paint.Style.FILL_AND_STROKE);
        Canvas canvas=new Canvas(bitmap);
        int cx=100;
        int cy=100;
        int radius=20;
        canvas.drawCircle(cx, cy, radius, paint);
        chooseView.setImageBitmap(bitmap);
        
       //路徑
        Paint paint=new Paint();
        paint.setColor(Color.BLUE);
        paint.setStyle(Paint.Style.STROKE);
        
        //路
        Path path=new Path();
        path.moveTo(20, 20);
        path.lineTo(100, 200);
        path.lineTo(204, 164);
        path.lineTo(250, 175);
        path.lineTo(20, 20);
        Canvas canvas=new Canvas(bitmap);
        canvas.drawPath(path, paint);
        chooseView.setImageBitmap(bitmap);
        
       
        //繪製字體
        Paint paint=new Paint();
        paint.setColor(Color.YELLOW);
        paint.setTextSize(40);
        paint.setTypeface(Typeface.DEFAULT_BOLD);//設置字體
        //引用外部字體
        //Typeface typeface=Typeface.createFromAsset(getAssets(), "newFont.ttf");
        //paint.setTypeface(typeface);
        
        Canvas canvas=new Canvas(bitmap);
        canvas.drawText("fuck you!", 50, 100, paint);
        chooseView.setImageBitmap(bitmap);
        
         //把字畫在線上
        Paint paint=new Paint();
        paint.setColor(Color.CYAN);
        paint.setTextSize(20);
        paint.setTypeface(Typeface.DEFAULT);
        
        Path path=new Path();
        path.moveTo(20, 20);
        path.lineTo(100, 150);
        path.lineTo(200, 220);
        
        Canvas canvas=new Canvas(bitmap);
        canvas.drawTextOnPath("Fuck you this text is on path!", path, 0, 0, paint);
       chooseView.setImageBitmap(bitmap);