android学习之绘图总结
以下是程序的运行结果：
代码如下：
package com.example.njupt.zhb.canvastest;
import android.R.integer;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.PathEffect;
import android.graphics.RectF;
import android.graphics.Path;
import android.graphics.Shader;
import android.graphics.LinearGradient;
//主程序中继承自Android.view.View的 MyView类，重写 MyView的onDraw（）方法，
//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，
//以 paint.setColor() 改变图形颜色、以 paint.setStyle()的设置来控制画出的的
//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
//象里的属性设置，也会有不同的外观模式。
public class MyDrawActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/*设置ContentView为自定义的MyVieW*/
MyView myView=new MyView(this);
setContentView(myView);
}
/* 自定义继承View 的MyView*/
private class MyView extends View {
public MyView(Context context){
super(context) ;
}
/*重写onDraw（）*/
@Override
protected void onDraw(Canvas canvas)
{
super.onDraw(canvas);
/*设置背景为白色*/
canvas.drawColor(Color.WHITE);
Paint paint=new Paint();
/*去锯齿*/
paint.setAntiAlias(true);
/*设置paint的颜色*/
paint.setColor(Color.RED);
/*设置paint的 style 为STROKE：空心*/
paint.setStyle(Paint.Style.STROKE);
/*设置paint的外框宽度*/
paint.setStrokeWidth(3);
/*画一个空心圆形*/
canvas.drawCircle(40, 40, 30, paint);
/*画一个空心正方形*/
canvas.drawRect(10, 90, 70, 150, paint);
/*画一个空心长方形*/
canvas.drawRect(10, 170, 70,200, paint);
/*画一个空心椭圆形*/
canvas.drawOval(new RectF(10,220,70,250), paint);
/*画一个空心三角形*/
Path path=new Path();
path.moveTo(10, 330);
path.lineTo(70,330);
path.lineTo(40,270);
path.close();
canvas.drawPath(path, paint);
/*画一个空心梯形*/
Path path1=new Path();
path1.moveTo(10, 410);
path1.lineTo(70,410);
path1.lineTo(55,350);
path1.lineTo(25, 350);
path1.close();
canvas.drawPath(path1, paint);
/*设置paint的颜色*/
paint.setColor(Color.BLUE);
/*设置paint 的style为 FILL：实心*/
paint.setStyle(Paint.Style.FILL);
/*画一个实心圆*/
canvas.drawCircle(120,40,30, paint);
/*画一个实心正方形*/
canvas.drawRect(90, 90, 150, 150, paint);
/*画一个实心长方形*/
canvas.drawRect(90, 170, 150,200, paint);
/*画一个实心椭圆*/
RectF re2=new RectF(90,220,150,250);
canvas.drawOval(re2, paint);
/*画一个实心三角形*/
Path path2=new Path();
path2.moveTo(90, 330);
path2.lineTo(150,330);
path2.lineTo(120,270);
path2.close();
canvas.drawPath(path2, paint);
/*画一个实心梯形*/
Path path3=new Path();
path3.moveTo(90, 410);
path3.lineTo(150,410);
path3.lineTo(135,350);
path3.lineTo(105, 350);
path3.close();
canvas.drawPath(path3, paint);
/*设置渐变色*/
Shader mShader=new LinearGradient(0,0,100,100,
new int[]{Color.RED,Color.GREEN,Color.BLUE,Color.YELLOW},
null,Shader.TileMode.REPEAT);
//Shader.TileMode三种模式
//REPEAT:沿着渐变方向循环重复
//CLAMP:如果在预先定义的范围外画的话，就重复边界的颜色
//MIRROR:与REPEAT一样都是循环重复，但这个会对称重复
paint.setShader(mShader);//用Shader中定义定义的颜色来话
/*画一个渐变色圆*/
canvas.drawCircle(200,40,30, paint);
/*画一个渐变色正方形*/
canvas.drawRect(170, 90, 230, 150, paint);
/*画一个渐变色长方形*/
canvas.drawRect(170, 170, 230,200, paint);
/*画一个渐变色椭圆*/
RectF re3=new RectF(170,220,230,250);
canvas.drawOval(re3, paint);
/*画一个渐变色三角形*/
Path path4=new Path();
path4.moveTo(170,330);
path4.lineTo(230,330);
path4.lineTo(200,270);
path4.close();
canvas.drawPath(path4, paint);
/*画一个渐变色梯形*/
Path path5=new Path();
path5.moveTo(170, 410);
path5.lineTo(230,410);
path5.lineTo(215,350);
path5.lineTo(185, 350);
path5.close();
canvas.drawPath(path5, paint);
/*写字*/
paint.setTextSize(24);
canvas.drawText("圆形", 240, 50, paint);
canvas.drawText("正方形", 240, 120, paint);
canvas.drawText("长方形", 240, 190, paint);
canvas.drawText("椭圆形", 240, 250, paint);
canvas.drawText("三角形", 240, 320, paint);
canvas.drawText("梯形", 240, 390, paint);
/*虚线和虚线圆*/
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.BLUE);
DashPathEffect effects = new DashPathEffect(new float[]{5,5,5,5},1);
paint.setPathEffect(effects);
canvas.drawCircle(120, 460, 50, paint);
canvas.drawLine(0, 400, 240, 400, paint);
/*画位图*/
Bitmap bitmap=BitmapFactory.decodeResource(getResources(), R.drawable.lenna);
RectF dst=new RectF(10,500,bitmap.getWidth()/2+10,bitmap.getHeight()/2+500);
canvas.drawBitmap(bitmap, null, dst, paint);
}
}
}