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效果图如下:
步骤:新建项目“PanitProject”,游戏框架为MySurfaceView 游戏框架,具体步骤参照“
11.游戏开发基础(SurfaceView 游戏框架、View 和 SurfaceView 的区别)
”。
主要绘图方法myDraw()修改如下:
public void myDraw()
try {
canvas =sfh.lockCanvas();
if(canvas!=null)
canvas.drawColor(Color.WHITE);
//--设置画笔无锯齿
Paint paint1 = new Paint();
canvas.drawCircle(40,30,20,paint1);
paint1.setAntiAlias(true);
canvas.drawCircle(100,30,20,paint1);
//--设置画笔的透明度
canvas.drawText("无透明度",100,70,new Paint());
Paint paint2 = new Paint();
paint2.setAlpha(0x77);
canvas.drawText("半透明度",20,70,new Paint());
//--设置绘制文本的锚点
canvas.drawText("锚点",20,90,new Paint());
Paint paint3 = new Paint();
//设置以文本的中心点绘制
paint3.setTextAlign(Paint.Align.CENTER);
canvas.drawText("锚点",20,105,paint3);
//--获取文本的长度
Paint paint4 = new Paint();
float len = paint4.measureText("文本宽度:");
canvas.drawText("文本长度:"+len,20,130,new Paint());
//--设置画笔样式
canvas.drawRect(new Rect(20,140,40,160),new Paint());
Paint paint5 = new Paint();
//设置画笔不填充
paint5.setStyle(Paint.Style.STROKE);
canvas.drawRect(new Rect(60,140,80,160),paint5);
//--设置画笔颜色
Paint paint6 = new Paint();
paint6.setColor(Color.BLUE);
canvas.drawText("蓝色",30,180,paint6);
//--设置画笔的粗细程度
canvas.drawLine(20,200,70,200,new Paint());
Paint paint7 = new Paint();
paint7.setStrokeWidth(7);
canvas.drawLine(20,220,70,220,paint7);
//--设置画笔绘制文本的字体粗细
Paint paint8 = new Paint();
paint8.setTextSize(20);
canvas.drawText("文字尺寸",20,260,paint8);
//--设置画笔的ARGB 分量
Paint paint9 = new Paint();
paint9.setARGB(0x77,0xff,0x00,0x00);
canvas.drawText("红色半透明",20,290,paint9);
catch(Exception ex){
}finally {
if(canvas!=null)
sfh.unlockCanvasAndPost(canvas);
Paint 画笔类提供了一个抗锯齿的函数,其实 Canvas 画布也提供额绘图抗锯齿的函数,如下所示:
Canvas.setDrawFilter(DrawFilter filter);
作用:为画布设置绘图抗锯齿
参数:绘图过滤器实例
实例化一个DrawFilter 类的对象,代码如下所示:
PaintFlagsDrawFilter pfd = new PaintFlagsDrawFilter(0,Paint.ANTI_ALIAS_FLAG|Paint.FILTER_BITMAP_FLAG);