Android(安卓)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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