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jQuery

于 2013-05-22 发布 文件大小:183KB
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  这是一款变化灵活的图片渐隐切换代码,非常实用,请大家关注,谢谢使用!(This is a flexible image change fade switching code, very useful, please everyone' s attention, thanks to use!)

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  • android canvas详解
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15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 package com.android777.demo.uicontroller.graphics;                                                                                                                                      import android.app.Activity;   import android.content.Context;   import android.graphics.Canvas;   import android.graphics.Color;   import android.graphics.Paint;   import android.os.Bundle;   import android.view.View;                                                                                                                                      public class CanvasDemoActivity extends Activity {                                                                                                                                          @Override       protected void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);                                                                                                                                              setContentView(newCustomView1(this));                                                                                                                                          }                                                                                                                                          /**        * 使用内部类 自定义一个简单的View        * @author Administrator        *        */     class CustomView1 extends View{                                                                                                                                              Paint paint;                                                                                                                                              public CustomView1(Context context) {               super(context);               paint =newPaint();//设置一个笔刷大小是3的黄色的画笔               paint.setColor(Color.YELLOW);               paint.setStrokeJoin(Paint.Join.ROUND);               paint.setStrokeCap(Paint.Cap.ROUND);               paint.setStrokeWidth(3);           }                                                                                                                                              //在这里我们将测试canvas提供的绘制图形方法           @Override           protected void onDraw(Canvas canvas) {                                                                                                                                              }                                                                                                                                          }                                                                                                                                      } 执行结果是一片黑色的区域,因为在自定义的CustomView1中,我们没有做任何的绘制操作。canvas提供的绘制图形的方法都是以draw开头的,我们可以查看api: 从上面方法的名字看来我们可以知道Canvas可以绘制的对象有:弧线(arcs)、填充颜色(argb和color)、 Bitmap、圆(circle和oval)、点(point)、线(line)、矩形(Rect)、图片(Picture)、圆角矩形 (RoundRect)、文本(text)、顶点(Vertices)、路径(path)。通过组合这些对象我们可以画出一些简单有趣的界面出来,但是光有这些功能还是不够的,如果我要画一个仪表盘(数字围绕显示在一个圆圈中)呢? 幸好Android还提供了一些对Canvas位置转换的方法:rorate、scale、translate、skew(扭曲)等,而且它允许你通过获得它的转换矩阵对象(getMatrix方法,不知道什么是转换矩阵?看这里) 直接操作它。这些操作就像是虽然你的笔还是原来的地方画,但是画纸旋转或者移动了,所以你画的东西的方位就产生变化。为了方便一些转换操作,Canvas 还提供了保存和回滚属性的方法(save和restore),比如你可以先保存目前画纸的位置(save),然后旋转90度,向下移动100像素后画一些图形,画完后调用restore方法返回到刚才保存的位置。下面我们就演示下canvas的一些简单用法: 1 2 3 4 protected void onDraw(Canvas canvas) {                                                                                                                                          canvas.drawCircle(100, 100, 90, paint);   } 效果是: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 @Override   protected void onDraw(Canvas canvas) {                                                                                                                                          //绘制弧线区域                                                                                                                                          RectF rect =newRectF(0, 0, 100, 100);                                                                                                                                          canvas.drawArc(rect,//弧线所使用的矩形区域大小               0, //开始角度               90,//扫过的角度               false,//是否使用中心               paint);                                                                                                                                      } 使用下面的代码: 1 2 3 4 5 6 7 8 9 10 11 12 13 protected void onDraw(Canvas canvas) {                                                                                                                                          //绘制弧线区域                                                                                                                                          RectF rect =newRectF(0, 0, 100, 100);                                                                                                                                          canvas.drawArc(rect,//弧线所使用的矩形区域大小               0, //开始角度               90,//扫过的角度               true,//是否使用中心               paint);                                                                                                                                      } 两图对比我们可以发现,当 drawArcs(rect,startAngel,sweepAngel,useCenter,paint)中的useCenter为false时,弧线区域是用弧线开始角度和结束角度直接连接起来的,当useCenter为true时,是弧线开始角度和结束角度都与中心点连接,形成一个扇形。 1 2 3 4 5 protected void onDraw(Canvas canvas) {                                                                                                                                          canvas.drawColor(Color.BLUE);                                                                                                                                      } canvas.drawColor是直接将View显示区域用某个颜色填充满。 1 2 3 4 5 6 7 @Override   protected void onDraw(Canvas canvas) {                                                                                                                                          //画一条线       canvas.drawLine(10, 10, 100, 100, paint);                                                                                                                                      } Canvas.drawOval: 1 2 3 4 5 6 7 8 9 @Override   protected void onDraw(Canvas canvas) {                                                                                                                                          //定义一个矩形区域       RectF oval =newRectF(0,0,200,300);       //矩形区域内切椭圆       canvas.drawOval(oval, paint);                                                                                                                                      } canvas.drawPosText: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 @Override   protected void onDraw(Canvas canvas) {                                                                                                                                          //按照既定点 绘制文本内容       canvas.drawPosText("Android777",newfloat[]{               10,10,//第一个字母在坐标10,10               20,20,//第二个字母在坐标20,20               30,30,//....               40,40,               50,50,               60,60,               70,70,               80,80,               90,90,               100,100       }, paint);                                                                                                                                      } canvas.drawRect: 1 2 3 4 5 6 7 8 9 10 @Override       protected void onDraw(Canvas canvas) {                                                                                                                                              RectF rect =newRectF(50, 50, 200, 200);                                                                                                                                              canvas.drawRect(rect, paint);                                                                                                                                          }                                                                                                                                      } canvas.drawRoundRect: 1 2 3 4 5 6 7 8 9 10 11 @Override   protected void onDraw(Canvas canvas) {                                                                                                                                          RectF rect =newRectF(50, 50, 200, 200);                                                                                                                                          canvas.drawRoundRect(rect,                           30,//x轴的半径                           30,//y轴的半径                           paint);                                                                                                                                      } canvas.drawPath: 1 2 3 4 5 6 7 8 9 10 11 12 @Override   protected void onDraw(Canvas canvas) {                                                                                                                                          Path path =newPath();//定义一条路径       path.moveTo(10, 10);//移动到 坐标10,10       path.lineTo(50, 60);       path.lineTo(200,80);       path.lineTo(10, 10);                                                                                                                                          canvas.drawPath(path, paint);                                                                                                                                      } canvas.drawTextOnPath: 1 2 3 4 5 6 7 8 9 10 11 12 13 @Override           protected void onDraw(Canvas canvas) {                                                                                                                                                  Path path =newPath();//定义一条路径               path.moveTo(10, 10);//移动到 坐标10,10               path.lineTo(50, 60);               path.lineTo(200,80);               path.lineTo(10, 10);                                                                                                                                      //          canvas.drawPath(path, paint);               canvas.drawTextOnPath("Android777开发者博客", path, 10, 10, paint);                                                                                                                                              } 位置转换方法,canvas.rorate和canvas.translate: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 @Override   protected void onDraw(Canvas canvas) {   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