游戲開發(fā)基礎part3--Paint 畫筆

Paint畫筆是繪圖的輔助類，一般它是作為畫布的參數(shù)來實現(xiàn)相應的效果，Paint類中包含文字與位圖的樣式、顏色等屬性信息。Paint的常用方法如下：

1.setAntiAlias(boolean aa)

作用：設置畫筆是否無鋸齒

參數(shù)：true表示無鋸齒，false表示有鋸齒，默認為flase。

2.setAlpha(int a)

作用：設置畫筆透明度

參數(shù)：透明度

3.setTextAlign(Paint.Align align)

作用：設置繪制文本的錨點

參數(shù)：Paint.Align類中的常量

4.measureText(String text)

作用：獲取文本內(nèi)容的寬度

參數(shù)：文本內(nèi)容

5.setStyle(Style style)

作用：設置畫筆樣式

參數(shù)：樣式實例

6.setColor(int color)

作用：設置畫筆顏色

參數(shù)：色值

7.setStrokeWidth(float width)

作用：設置畫筆的粗細程度

參數(shù)；畫筆粗細值

8.setTextSize(float textSize)

作用：設置畫筆在繪制文本時，文本字體的尺寸

參數(shù)：尺寸值

9.setARGB(int a, int r ,int g, int b)

作用：設置畫筆的ARGB分量

第一個參數(shù)：畫筆透明度分量

第二個參數(shù)：畫筆紅色分量

第三個參數(shù)：畫筆綠色分量

第四個參數(shù)：畫筆藍色分量

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創(chuàng)建項目實例：PaintProject

項目運行效果：

項目源代碼：

==>MySurfaceView.java

package com.paint;import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Paint.Style; import android.graphics.Rect; import android.view.SurfaceHolder; import android.view.SurfaceHolder.Callback; import android.view.SurfaceView;public class MySurfaceView extends SurfaceView implements Callback {//用于控制SurfaceViewprivate SurfaceHolder sfh;private Paint paint;private Canvas canvas;public MySurfaceView(Context context) {super(context);//實例SurfaceHoldersfh = this.getHolder();//為SurfaceView添加狀態(tài)監(jiān)聽sfh.addCallback(this);//實例一個畫筆paint = new Paint();//設置畫筆顏色為白色paint.setColor(Color.WHITE);}@Overridepublic void surfaceCreated(SurfaceHolder holder) {// TODO Auto-generated method stubmyDraw();}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width,int height) {// TODO Auto-generated method stub}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {// TODO Auto-generated method stub}/*** 自定義繪圖函數(shù)*/public void myDraw(){try{canvas = sfh.lockCanvas();if (canvas != null){canvas.drawColor(Color.WHITE);//----設置畫筆無鋸齒Paint paint1 = new Paint();canvas.drawCircle(40, 30, 20, paint1);paint1.setAntiAlias(true);canvas.drawCircle(100, 30, 20, paint1);//----設置畫筆的透明度canvas.drawText("無透明度",100,70,new Paint());Paint paint2 = new Paint();paint2.setAlpha(0x77);canvas.drawText("半透明度",20,70,paint2);//----設置繪制文本的錨點canvas.drawText("錨點", 20, 90, new Paint());Paint paint3 = new Paint();//設置以文本的中心繪制paint3.setTextAlign(Paint.Align.CENTER);canvas.drawText("錨點",20,105,paint3);//-----獲取文本的長度Paint paint4 = new Paint();float len = paint4.measureText("文本寬度:");canvas.drawText("文本長度:"+len, 20, 130, new Paint());//----設置畫筆樣式canvas.drawRect(new Rect(20,140,40,160),new Paint());Paint paint5 = new Paint();//設置畫筆不填充paint5.setStyle(Style.STROKE);canvas.drawRect(new Rect(60,140,40,160), paint5);//----設置畫筆顏色Paint paint6 = new Paint();paint6.setColor(Color.GRAY);canvas.drawText("灰色", 30, 180, paint6);//----設置畫筆粗細程度canvas.drawLine(20, 200, 70, 200, new Paint());Paint paint7 = new Paint();paint7.setStrokeWidth(7);canvas.drawLine(20, 220, 70, 220, paint7);//----設置畫筆繪制文本的字體粗細Paint paint8 = new Paint();paint8.setTextSize(20);canvas.drawText("文字尺寸", 20, 260, paint8);//----設置畫筆ARGB分量Paint paint9 = new Paint();paint9.setARGB(0x77, 0xff, 0x00, 0x00);canvas.drawText("紅色半透明", 20, 290, paint9);}} catch(Exception e){}finally{if(canvas != null)sfh.unlockCanvasAndPost(canvas);}} }

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轉(zhuǎn)載于:https://www.cnblogs.com/wwj9413/archive/2012/06/18/2638570.html

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