android绘图网格线

package com.example.helloworldnn;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;


public class MyCanvas extends View{
	
	Paint  paint;  //绘图
	
  public MyCanvas(Context context) {
		super(context);
		// TODO Auto-generated constructor stub
		
		paint = new Paint();
		paint.setColor(Color.YELLOW);
		 paint.setStrokeJoin(Paint.Join.ROUND);    
         paint.setStrokeCap(Paint.Cap.ROUND);    
         paint.setStrokeWidth(3);   
	}
   
   /**
    * 绘制网格线
    */
   protected void onDraw(Canvas canvas){
	  canvas.drawColor(Color.BLUE);
	  //canvas.drawCircle(100, 100, 90, paint);
	  final int width = 480;  //hdpi 480x800
	  final int height = 800; 
	  final int edgeWidth = 10;
	  final int space = 30;   //长宽间隔
	  int vertz = 0;
	  int hortz = 0;
	  for(int i=0;i<100;i++){
	     canvas.drawLine(0,  vertz,  width, vertz, paint);
	     canvas.drawLine(hortz, 0, hortz, height, paint);
	     vertz+=space;
	     hortz+=space;
	  }
  }
}