android 基本的画图方法

//画布绘图的一些应用
   //画一个点        Paint paint=new Paint();        paint.setColor(Color.BLUE);        paint.setStrokeWidth(100);//设置点的宽度        Canvas canvas=new Canvas(bitmap);        canvas.drawPoint(100, 100, paint);        chooseView.setImageBitmap(bitmap);       //画一条直线        Paint paint=new Paint();        paint.setColor(Color.BLUE);        paint.setStrokeWidth(10);//设置点的宽度        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);                //画一个矩形        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);       //椭圆        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);                        //圆        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);               //路径        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);                       //绘制字体        Paint paint=new Paint();        paint.setColor(Color.YELLOW);        paint.setTextSize(40);        paint.setTypeface(Typeface.DEFAULT_BOLD);//设置字体        //引用外部字体        //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);                 //把字画在线上        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);
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