• Android Path的使用


      1 import android.app.Activity;   
      2 import android.os.Bundle;   
      3 import android.view.View;   
      4 import android.content.Context;   
      5 import android.graphics.Canvas;   
      6 import android.graphics.Color;   
      7 import android.graphics.Paint;   
      8 import android.graphics.RectF;   
      9 import android.graphics.Path;   
     10 import android.graphics.Shader;   
     11 import android.graphics.LinearGradient;   
     12 //主程序中继承自Android.view.View的 MyView类,重写 MyView的onDraw()方法,   
     13 //一开始就会运行绘制的工作,在onDraw()中以Paint将几何图形绘制在Canvas上,   
     14 //以 paint.setColor() 改变图形颜色、以 paint.setStyle()的设置来控制画出的的   
     15 //图形是空心还是实心。程序的最后一段,就是直接在Canvas写上文字,随着Paint对   
     16 //象里的属性设置,也会有不同的外观模式。 
     17 public class GraphicesActivity extends Activity {   
     18     /** Called when the activity is first created. */  
     19     @Override  
     20     public void onCreate(Bundle savedInstanceState) {   
     21         super.onCreate(savedInstanceState);   
     22         /*设置ContentView为自定义的MyVieW*/  
     23         MyView myView=new MyView(this);   
     24         setContentView(myView);   
     25     }   
     26         
     27     /* 自定义继承View 的MyView*/  
     28     private class MyView extends View {   
     29          public MyView(Context context){   
     30             super(context) ;   
     31          }   
     32             
     33          /*重写onDraw()*/  
     34          @Override  
     35          protected void onDraw(Canvas canvas)   
     36          {      
     37               super.onDraw(canvas);   
     38               /*设置背景为白色*/  
     39               canvas.drawColor(Color.WHITE);   
     40                   
     41               Paint paint=new Paint();   
     42               /*去锯齿*/  
     43               paint.setAntiAlias(true);   
     44               /*设置paint的颜色*/  
     45               paint.setColor(Color.RED);   
     46               /*设置paint的 style 为STROKE:空心*/  
     47               paint.setStyle(Paint.Style.STROKE);   
     48               /*设置paint的外框宽度*/  
     49               paint.setStrokeWidth(3);   
     50                   
     51               /*画一个空心圆形*/  
     52               canvas.drawCircle(40, 40, 30, paint);   
     53               /*画一个空心正方形*/  
     54               canvas.drawRect(10, 90, 70, 150, paint);   
     55               /*画一个空心长方形*/  
     56               canvas.drawRect(10, 170, 70,200, paint);   
     57               /*画一个空心椭圆形*/  
     58               canvas.drawOval(new RectF(10,220,70,250), paint);   
     59               /*画一个空心三角形*/  
     60               Path path=new Path();   
     61               path.moveTo(10, 330);   
     62               path.lineTo(70,330);   
     63               path.lineTo(40,270);   
     64               path.close();   
     65               canvas.drawPath(path, paint);   
     66               /*画一个空心梯形*/  
     67               Path path1=new Path();   
     68               path1.moveTo(10, 410);   
     69               path1.lineTo(70,410);   
     70               path1.lineTo(55,350);   
     71               path1.lineTo(25, 350);   
     72               path1.close();   
     73               canvas.drawPath(path1, paint);   
     74                   
     75               /*设置paint的颜色*/  
     76               paint.setColor(Color.BLUE);   
     77               /*设置paint 的style为 FILL:实心*/  
     78               paint.setStyle(Paint.Style.FILL);   
     79               /*画一个实心圆*/  
     80               canvas.drawCircle(120,40,30, paint);   
     81               /*画一个实心正方形*/  
     82               canvas.drawRect(90, 90, 150, 150, paint);   
     83               /*画一个实心长方形*/  
     84               canvas.drawRect(90, 170, 150,200, paint);   
     85               /*画一个实心椭圆*/  
     86               RectF re2=new RectF(90,220,150,250);   
     87               canvas.drawOval(re2, paint);   
     88               /*画一个实心三角形*/  
     89               Path path2=new Path();   
     90               path2.moveTo(90, 330);   
     91               path2.lineTo(150,330);   
     92               path2.lineTo(120,270);   
     93               path2.close();   
     94               canvas.drawPath(path2, paint);   
     95               /*画一个实心梯形*/  
     96               Path path3=new Path();   
     97               path3.moveTo(90, 410);   
     98               path3.lineTo(150,410);   
     99               path3.lineTo(135,350);   
    100               path3.lineTo(105, 350);   
    101               path3.close();   
    102               canvas.drawPath(path3, paint);   
    103                   
    104               /*设置渐变色*/  
    105               Shader mShader=new LinearGradient(0,0,100,100,   
    106                       new int[]{Color.RED,Color.GREEN,Color.BLUE,Color.YELLOW},   
    107                       null,Shader.TileMode.REPEAT);   
    108               //Shader.TileMode三种模式   
    109               //REPEAT:沿着渐变方向循环重复   
    110               //CLAMP:如果在预先定义的范围外画的话,就重复边界的颜色   
    111               //MIRROR:与REPEAT一样都是循环重复,但这个会对称重复   
    112               paint.setShader(mShader);//用Shader中定义定义的颜色来话   
    113                
    114               /*画一个渐变色圆*/  
    115               canvas.drawCircle(200,40,30, paint);   
    116               /*画一个渐变色正方形*/  
    117               canvas.drawRect(170, 90, 230, 150, paint);   
    118               /*画一个渐变色长方形*/  
    119               canvas.drawRect(170, 170, 230,200, paint);   
    120               /*画一个渐变色椭圆*/  
    121               RectF re3=new RectF(170,220,230,250);   
    122               canvas.drawOval(re3, paint);   
    123               /*画一个渐变色三角形*/  
    124               Path path4=new Path();   
    125               path4.moveTo(170,330);   
    126               path4.lineTo(230,330);   
    127               path4.lineTo(200,270);   
    128               path4.close();   
    129               canvas.drawPath(path4, paint);   
    130               /*画一个渐变色梯形*/  
    131               Path path5=new Path();   
    132               path5.moveTo(170, 410);   
    133               path5.lineTo(230,410);   
    134               path5.lineTo(215,350);   
    135               path5.lineTo(185, 350);   
    136               path5.close();   
    137               canvas.drawPath(path5, paint);   
    138                   
    139               /*写字*/  
    140               paint.setTextSize(24);   
    141               canvas.drawText("圆形", 240, 50, paint);   
    142               canvas.drawText("正方形", 240, 120, paint);   
    143               canvas.drawText("长方形", 240, 190, paint);   
    144               canvas.drawText("椭圆形", 240, 250, paint);   
    145               canvas.drawText("三角形", 240, 320, paint);   
    146               canvas.drawText("梯形", 240, 390, paint);     
    147          }   
    148     }   
    149 }
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  • 原文地址:https://www.cnblogs.com/greywolf/p/2815028.html
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