画布函数介绍-android游戏开发
主要函数介绍：
//----设置画布绘图无锯齿
canvas.setDrawFilter(pfd);
//----利用填充画布，刷屏
canvas.drawColor(Color.BLACK);
//----绘制文本
canvas.drawText("drawtext", 10, 10, paint);
//----绘制像素点
canvas.drawPoint(10,20,paint);
//----绘制多个像素点
canvas.drawPoints(new float[]{10,30,30,30}, paint);
//----绘制直线
canvas.drawLine(10, 40, 50, 40, paint);
//----绘制多条直线
canvas.drawLines(new float[] { 10, 50, 50, 50, 70, 50, 110, 50 }, paint);
//----绘制矩形
canvas.drawRect(10, 60, 40, 100, paint);
//----绘制矩形2
Rect rect = new Rect(10, 110, 60, 130);
canvas.drawRect(rect, paint);
//----绘制圆角矩形
RectF rectF = new RectF(10, 140, 60, 170);
canvas.drawRoundRect(rectF, 5, 5, paint);
//----绘制圆形
canvas.drawCircle(20, 200, 20, paint);
//----绘制弧形
canvas.drawArc(new RectF(150, 20, 200, 70), 0, 230, true, paint);
//----绘制椭圆
canvas.drawOval(new RectF(150, 80, 180, 100), paint);
//----绘制指定路径图形
Path path = new Path();
//设置路径起点
path.moveTo(160, 150);
//路线1
path.lineTo(200, 150);
//路线2
path.lineTo(180, 200);
//路径结束
path.close();
canvas.drawPath(path, paint);
//----绘制指定路径图形
Path pathCircle = new Path();
//添加一个圆形的路径
pathCircle.addCircle(130, 260, 20, Path.Direction.CCW);
//----绘制带圆形的路径文本
canvas.drawTextOnPath("PathText", pathCircle, 10, 20, paint);
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.PaintFlagsDrawFilter; 9 import android.graphics.Path; 10 import android.graphics.Rect; 11 import android.graphics.RectF; 12 import android.util.Log; 13 import android.view.MotionEvent; 14 import android.view.SurfaceHolder; 15 import android.view.SurfaceHolder.Callback; 16 import android.view.SurfaceView; 17 18 public class canvarsView extends SurfaceView implements Callback, Runnable { 19 private Paint paint;// 画布 20 private SurfaceHolder sfh; // 用于控制SurfaceView 21 private Canvas canvas;// 画布 22 private boolean flag;// 关闭线程标志 23 private Thread th;// 新建线程 24 25 //设置画布绘图无锯齿 26 private PaintFlagsDrawFilter pfd=new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG); 27 28 public canvarsView(Context context) { 29 super(context); 30 sfh = this.getHolder();// 实例SurfaceHolder 31 sfh.addCallback(this);// 为SurfaceView添加状态监听 32 paint = new Paint();//实例一个画笔 33 paint.setColor(Color.WHITE);//设置画笔颜色为白色 34 setFocusable(true);//设置焦点 35 } 36 37 @Override 38 public void surfaceCreated(SurfaceHolder holder) { 39 flag = true; 40 //实例线程 41 th = new Thread(this); 42 //启动线程 43 th.start(); 44 } 45 46 public void mydraw() { 47 try { 48 canvas = sfh.lockCanvas();//锁定画布 49 if (canvas != null) { 50 //----设置画布绘图无锯齿 51 canvas.setDrawFilter(pfd); 52 //----利用填充画布，刷屏 53 canvas.drawColor(Color.BLACK); 54 //----绘制文本 55 canvas.drawText("drawtext", 10, 10, paint); 56 //----绘制像素点 57 canvas.drawPoint(10,20,paint); 58 //----绘制多个像素点 59 canvas.drawPoints(new float[]{10,30,30,30}, paint); 60 //----绘制直线 61 canvas.drawLine(10, 40, 50, 40, paint); 62 //----绘制多条直线 63 canvas.drawLines(new float[] { 10, 50, 50, 50, 70, 50, 110, 50 }, paint); 64 //----绘制矩形 65 canvas.drawRect(10, 60, 40, 100, paint); 66 //----绘制矩形2 67 Rect rect = new Rect(10, 110, 60, 130); 68 canvas.drawRect(rect, paint); 69 //----绘制圆角矩形 70 RectF rectF = new RectF(10, 140, 60, 170); 71 canvas.drawRoundRect(rectF, 5, 5, paint); 72 //----绘制圆形 73 canvas.drawCircle(20, 200, 20, paint); 74 //----绘制弧形 75 canvas.drawArc(new RectF(150, 20, 200, 70), 0, 230, true, paint); 76 //----绘制椭圆 77 canvas.drawOval(new RectF(150, 80, 180, 100), paint); 78 //----绘制指定路径图形 79 Path path = new Path(); 80 //设置路径起点 81 path.moveTo(160, 150); 82 //路线1 83 path.lineTo(200, 150); 84 //路线2 85 path.lineTo(180, 200); 86 //路径结束 87 path.close(); 88 canvas.drawPath(path, paint); 89 //----绘制指定路径图形 90 Path pathCircle = new Path(); 91 //添加一个圆形的路径 92 pathCircle.addCircle(130, 260, 20, Path.Direction.CCW); 93 //----绘制带圆形的路径文本 94 canvas.drawTextOnPath("PathText", pathCircle, 10, 20, paint); 95 } else { 96 Log.i("tt", "获取不到画布");//释放画布 97 } 98 } catch (Exception e) { 99 100 } finally { 101 if (canvas != null) 102 sfh.unlockCanvasAndPost(canvas); 103 } 104 } 105 /** 106 * SurfaceView视图状态发生改变，响应此函数 107 */ 108 @Override 109 public void surfaceChanged(SurfaceHolder holder, int format, int width, 110 int height) { 111 // TODO Auto-generated method stub 112 113 } 114 /** 115 * SurfaceView视图消亡时，响应此函数 116 */ 117 @Override 118 public void surfaceDestroyed(SurfaceHolder holder) { 119 flag = false;//结束游戏，设置线程关闭标志为false 120 121 } 122 123 public void logic() { 124 125 }; 126 127 @Override 128 public void run() { 129 while (flag) { 130 long start = System.currentTimeMillis(); 131 mydraw(); 132 logic(); 133 long end = System.currentTimeMillis(); 134 try { 135 if (end - start < 50) { 136 Thread.sleep(50 - (end - start)); 137 } 138 } catch (InterruptedException e) { 139 e.printStackTrace(); 140 } 141 } 142 } 143 //获取点击坐标 144 @Override 145 public boolean onTouchEvent(MotionEvent event) { 146 return true; 147 } 148 149 }
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 canvarsView(this)); 18 19 } 20 }
谢谢支持下网站“趣淘鼓浪屿（www.qtgly.com）”
posted on 2013-08-27 14:39 clarenceV1 阅读(391) 评论(0) 编辑 收藏 举报
