canvas画笔函数介绍--android游戏开发

函数介绍：

canvas.drawColor(Color.WHITE);
               Paint paint1 = new Paint();
               canvas.drawCircle(40, 30, 20, paint1);
               paint1.setAntiAlias(true);   //-----设置画笔无锯齿
               canvas.drawCircle(100, 30, 20, paint1);

               canvas.drawText("无透明度", 100, 70, new Paint());
               Paint paint2 = new Paint();
               paint2.setAlpha(0x77);//-----设置画笔的透明度
               canvas.drawText("半透明度", 20, 70, paint2);


               canvas.drawText("锚点", 20, 90, new Paint());
               Paint paint3 = new Paint();
               paint3.setTextAlign(Paint.Align.CENTER);//设置以文本的中心点绘制
               canvas.drawText("锚点", 20, 105, paint3);

               Paint paint4 = new Paint();
               float len =paint4.measureText("文本宽度:");//------获取文本的长度
               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();
               paint5.setStyle(Style.STROKE);//设置画笔不填充
               canvas.drawRect(new Rect(60,140,80,160), paint5);


               Paint paint6 = new Paint();
               paint6.setColor(Color.GRAY);   //------设置画笔颜色
               canvas.drawText("灰色", 30, 180, paint6);


               canvas.drawLine(20, 200,70, 200, new Paint());
               Paint paint7 = new Paint();
               paint7.setStrokeWidth(7);//------设置画笔的粗细程度
               canvas.drawLine(20, 220,70, 220,paint7);


               Paint paint8 = new Paint();
               paint8.setTextSize(20);
               canvas.drawText("文字尺寸", 20, 260, paint8);//------设置画笔绘制文本的字体粗细

               Paint paint9 = new Paint();
               paint9.setARGB(0x77, 0xff, 0x00, 0x00);//------设置画笔的ARGB分量
               canvas.drawText("红色半透明", 20, 290, paint9);

界面：

案例源码：

  1 package caicai.animation;
  2 import android.content.Context;
  3 import android.graphics.Bitmap;
  4 import android.graphics.BitmapFactory;
  5 import android.graphics.Canvas;
  6 import android.graphics.Color;
  7 import android.graphics.Paint;
  8 import android.graphics.Paint.Style;
  9 import android.graphics.PaintFlagsDrawFilter;
 10 import android.graphics.Path;
 11 import android.graphics.Rect;
 12 import android.graphics.RectF;
 13 import android.util.Log;
 14 import android.view.MotionEvent;
 15 import android.view.SurfaceHolder;
 16 import android.view.SurfaceHolder.Callback;
 17 import android.view.SurfaceView;
 18 
 19 public class paintView extends SurfaceView implements Callback, Runnable {
 20     private Paint paint;// 画布
 21     private SurfaceHolder sfh; // 用于控制SurfaceView
 22     private Canvas canvas;// 画布
 23     private boolean flag;// 关闭线程标志
 24     private Thread th;// 新建线程
 25 
 26     //设置画布绘图无锯齿
 27     private PaintFlagsDrawFilter pfd=new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG);
 28 
 29     public paintView(Context context) {
 30         super(context);
 31         sfh = this.getHolder();// 实例SurfaceHolder
 32         sfh.addCallback(this);// 为SurfaceView添加状态监听
 33         paint = new Paint();//实例一个画笔
 34         paint.setColor(Color.WHITE);//设置画笔颜色为白色
 35         setFocusable(true);//设置焦点
 36     }
 37 
 38     @Override
 39     public void surfaceCreated(SurfaceHolder holder) {
 40         flag = true;
 41         //实例线程
 42         th = new Thread(this);
 43         //启动线程
 44         th.start();
 45     }
 46 
 47     public void mydraw() {
 48         try {
 49             canvas = sfh.lockCanvas();//锁定画布
 50             if (canvas != null) {
 51                 canvas.drawColor(Color.WHITE);
 52                 Paint paint1 = new Paint();
 53                 canvas.drawCircle(40, 30, 20, paint1);
 54                 paint1.setAntiAlias(true);    //-----设置画笔无锯齿
 55                 canvas.drawCircle(100, 30, 20, paint1);
 56                 
 57                 canvas.drawText("无透明度", 100, 70, new Paint());
 58                 Paint paint2 = new Paint();
 59                 paint2.setAlpha(0x77);//-----设置画笔的透明度
 60                 canvas.drawText("半透明度", 20, 70, paint2);
 61                 
 62                 
 63                 canvas.drawText("锚点", 20, 90, new Paint());
 64                 Paint paint3 = new Paint();                
 65                 paint3.setTextAlign(Paint.Align.CENTER);//设置以文本的中心点绘制            
 66                 canvas.drawText("锚点", 20, 105, paint3);
 67                 
 68                 Paint paint4 = new Paint();
 69                 float len =paint4.measureText("文本宽度:");//------获取文本的长度
 70                 canvas.drawText("文本长度:"+len, 20, 130, new Paint());
 71                 
 72                 //------设置画笔样式
 73                 canvas.drawRect(new Rect(20,140,40,160), new Paint());
 74                 Paint paint5 = new Paint();            
 75                 paint5.setStyle(Style.STROKE);//设置画笔不填充
 76                 canvas.drawRect(new Rect(60,140,80,160), paint5);
 77                 
 78             
 79                 Paint paint6 = new Paint();
 80                 paint6.setColor(Color.GRAY);    //------设置画笔颜色
 81                 canvas.drawText("灰色", 30, 180, paint6);
 82                 
 83                 
 84                 canvas.drawLine(20, 200,70, 200, new Paint());
 85                 Paint paint7 = new Paint();
 86                 paint7.setStrokeWidth(7);//------设置画笔的粗细程度
 87                 canvas.drawLine(20, 220,70, 220,paint7);
 88                 
 89                 
 90                 Paint paint8 = new Paint();
 91                 paint8.setTextSize(20);
 92                 canvas.drawText("文字尺寸", 20, 260, paint8);//------设置画笔绘制文本的字体粗细
 93                 
 94                 Paint paint9 = new Paint();
 95                 paint9.setARGB(0x77, 0xff, 0x00, 0x00);//------设置画笔的ARGB分量
 96                 canvas.drawText("红色半透明", 20, 290, paint9);
 97             } else {
 98                 Log.i("tt", "获取不到画布");//释放画布
 99             }
100         } catch (Exception e) {
101 
102         } finally {
103             if (canvas != null)
104                 sfh.unlockCanvasAndPost(canvas);
105         }
106     }
107     /**
108      * SurfaceView视图状态发生改变，响应此函数
109      */
110     @Override
111     public void surfaceChanged(SurfaceHolder holder, int format, int width,
112             int height) {
113         // TODO Auto-generated method stub
114 
115     }
116     /**
117      * SurfaceView视图消亡时，响应此函数
118      */
119     @Override
120     public void surfaceDestroyed(SurfaceHolder holder) {
121         flag = false;//结束游戏，设置线程关闭标志为false
122 
123     }
124 
125     public void logic() {
126 
127     };
128 
129     @Override
130     public void run() {
131         while (flag) {
132             long start = System.currentTimeMillis();
133             mydraw();
134             logic();
135             long end = System.currentTimeMillis();
136             try {
137                 if (end - start < 50) {
138                     Thread.sleep(50 - (end - start));
139                 }
140             } catch (InterruptedException e) {
141                 e.printStackTrace();
142             }
143         }
144     }
145     //获取点击坐标
146     @Override
147     public boolean onTouchEvent(MotionEvent event) {
148         return true;
149     }
150 
151 }

paintView

 1 package caicai.animation;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.view.Window;
 6 import android.view.WindowManager;
 7 
 8 public class MainActivity extends Activity {
 9     /** Called when the activity is first created. */
10     @Override
11     public void onCreate(Bundle savedInstanceState) {
12         super.onCreate(savedInstanceState);
13         //设置全屏
14         this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
15         requestWindowFeature(Window.FEATURE_NO_TITLE);
16         //显示自定义的SurfaceView视图
17         setContentView(new paintView(this));
18 
19     }
20 }

MainActivity

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