ndroid 畫圖Path的使用
我們這篇帖子主要的還是給大家講了一下怎麼來用Path，這個在我們的android應用當中用到的很多，不多說什麼了，在代碼當中我已經註釋了中文意思，大家還是來看看吧：
[b]java代碼：[/b]
[code]
package eoe.demo;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.Path;
import android.graphics.Shader;
import android.graphics.LinearGradient;
//主程序中繼承自Android.view.View的 MyView類，重寫 MyView的onDraw（）方法，
//一開始就會運行繪製的工作，在onDraw（）中以Paint將幾何圖形繪製在Canvas上，
//以 paint.setColor() 改變圖形顏色、以 paint.setStyle()的設置來控制畫出的的
//圖形是空心還是實心。程序的最後一段，就是直接在Canvas寫上文字，隨着Paint對
//象裏的屬性設置，也會有不同的外觀模式。
public class GraphicesActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
/*設置ContentView爲自定義的MyVieW*/
MyView myView=new MyView(this);
setContentView(myView);
}
/* 自定義繼承View 的MyView*/
private class MyView extends View {
public MyView(Context context){
super(context) ;
}
/*重寫onDraw（）*/
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
/*設置背景爲白色*/
canvas.drawColor(Color.WHITE);
Paint paint=new Paint();
/*去鋸齒*/
paint.setAntiAlias(true);
/*設置paint的顏色*/
paint.setColor(Color.RED);
/*設置paint的 style 爲STROKE：空心*/
paint.setStyle(Paint.Style.STROKE);
/*設置paint的外框寬度*/
paint.setStrokeWidth(3);
/*畫一個空心圓形*/
canvas.drawCircle(40, 40, 30, paint);
/*畫一個空心正方形*/
canvas.drawRect(10, 90, 70, 150, paint);
/*畫一個空心長方形*/
canvas.drawRect(10, 170, 70,200, paint);
/*畫一個空心橢圓形*/
canvas.drawOval(new RectF(10,220,70,250), paint);
/*畫一個空心三角形*/
Path path=new Path();
path.moveTo(10, 330);
path.lineTo(70,330);
path.lineTo(40,270);
path.close();
canvas.drawPath(path, paint);
/*畫一個空心梯形*/
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);
/*設置paint的顏色*/
paint.setColor(Color.BLUE);
/*設置paint 的style爲 FILL：實心*/
paint.setStyle(Paint.Style.FILL);
/*畫一個實心圓*/
canvas.drawCircle(120,40,30, paint);
/*畫一個實心正方形*/
canvas.drawRect(90, 90, 150, 150, paint);
/*畫一個實心長方形*/
canvas.drawRect(90, 170, 150,200, paint);
/*畫一個實心橢圓*/
RectF re2=new RectF(90,220,150,250);
canvas.drawOval(re2, paint);
/*畫一個實心三角形*/
Path path2=new Path();
path2.moveTo(90, 330);
path2.lineTo(150,330);
path2.lineTo(120,270);
path2.close();
canvas.drawPath(path2, paint);
/*畫一個實心梯形*/
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);
/*設置漸變色*/
Shader mShader=new LinearGradient(0,0,100,100, new int[]{Color.RED,Color.GREEN,Color.BLUE,Color.YELLOW}, null,Shader.TileMode.REPEAT);
//Shader.TileMode三種模式
//REPEAT:沿着漸變方向循環重複
//CLAMP:如果在預先定義的範圍外畫的話，就重複邊界的顏色
//MIRROR:與REPEAT一樣都是循環重複，但這個會對稱重複
paint.setShader(mShader);
//用Shader中定義定義的顏色來話
/*畫一個漸變色圓*/
canvas.drawCircle(200,40,30, paint);
/*畫一個漸變色正方形*/
canvas.drawRect(170, 90, 230, 150, paint);
/*畫一個漸變色長方形*/
canvas.drawRect(170, 170, 230,200, paint);
/*畫一個漸變色橢圓*/
RectF re3=new RectF(170,220,230,250);
canvas.drawOval(re3, paint);
/*畫一個漸變色三角形*/
Path path4=new Path();
path4.moveTo(170,330);
path4.lineTo(230,330);
path4.lineTo(200,270);
path4.close();
canvas.drawPath(path4, paint);
/*畫一個漸變色梯形*/
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);
/*寫字*/
paint.setTextSize(24);
canvas.drawText("圓形", 240, 50, paint);
canvas.drawText("正方形", 240, 120, paint);
canvas.drawText("長方形", 240, 190, paint);
canvas.drawText("橢圓形", 240, 250, paint);
canvas.drawText("三角形", 240, 320, paint);
canvas.drawText("梯形", 240, 390, paint);
}
}
}[/code]