我的android绘图学习笔记（一）

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2010-11-04

偶打算绘制一个坐标轴，画一个折线图，一开始用直线画出了坐标轴，但是不太好看

先贴上代码

/** testPaint.java**/

package com.test;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 testPaint extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  MyView myview = new MyView(this);  setContentView(myview); } private class MyView extends View {  @Override  protected void onDraw(Canvas canvas) {   super.onDraw(canvas);   canvas.drawColor(Color.WHITE);   Paint paint =new Paint();   paint.setAntiAlias(true);   paint.setColor(Color.BLACK);   Paint paint1=new Paint();   paint1.setColor(Color.RED);   canvas.drawLine(30, 160, 300, 160, paint);   canvas.drawLine(30, 160, 30, 30, paint);   canvas.drawLine(30, 30, 24, 36, paint);   canvas.drawLine(30, 30, 36, 36, paint);   canvas.drawLine(300, 160, 294, 154, paint);   canvas.drawLine(300, 160,294, 166, paint);   paint.setTextSize(12);   canvas.drawText(getResources().getString(R.string.date), 280, 180,     paint);   canvas.drawText(getResources().getString(R.string.product), 1, 40, paint);  }  public MyView(Context context) {   super(context);  } }}

/**strings.xml*/

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="hello">Hello World, testPaint!</string>    <string name="app_name">testPaint</string><string name="date">天</string><string name="product">产量</string></resources>

运行效果

后来找了一种填充多边形的方法画箭头

/**testPaint.java*/

package com.test;import android.app.Activity;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.os.Bundle;import android.view.View;public class testPaint extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  MyView myview = new MyView(this);  setContentView(myview); } private class MyView extends View {  @Override  protected void onDraw(Canvas canvas) {   super.onDraw(canvas);   canvas.drawColor(Color.WHITE);   Paint paint =new Paint();   paint.setAntiAlias(true);   paint.setColor(Color.BLACK);   Paint paint1=new Paint();   paint1.setColor(Color.RED);   canvas.drawLine(30, 160, 300, 160, paint);   canvas.drawLine(30, 160, 30, 30, paint);   Path path=new Path();   path.moveTo(30, 30);   path.lineTo(25,35);   path.lineTo(30, 25);   path.lineTo(35, 35);   canvas.drawPath(path, paint);      Path path1=new Path();   path1.moveTo(300, 160);   path1.lineTo(295,155);   path1.lineTo(305, 160);   path1.lineTo(295, 165);   canvas.drawPath(path1, paint);      paint.setTextSize(12);   canvas.drawText(getResources().getString(R.string.date), 280, 180,     paint);   canvas.drawText(getResources().getString(R.string.product), 1, 40, paint);  }  public MyView(Context context) {   super(context);  } }}

运行效果

这样看起来好看多了，哈哈