LinearGradient线性渲染

[java] view
plaincopy

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.LinearGradient;

import android.graphics.Paint;

import android.graphics.Shader;

import android.view.View;



/**

* @version 2012-8-14 上午10:45:28

**/

public class myGameView extends View implements Runnable {

int bitwidth = 0;

int bitheight = 0;

Paint mPaint = null;

// 线性渐变渲染

Shader mLinearGradient1 = null;

// 线性渐变渲染

Shader mLinearGradient2 = null;

// 线性渐变渲染

Shader mLinearGradient3 = null;



public myGameView(Context context) {

super(context);

// 创建LinearGradient并设置渐变颜色数组

// 第一个,第二个参数表示渐变起点 可以设置起点终点在对角等任意位置

// 第三个,第四个参数表示渐变终点

// 第五个参数表示渐变颜色

// 第六个参数可以为空,表示坐标,值为0-1 new float[] {0.25f, 0.5f, 0.75f, 1 }

// 如果这是空的，颜色均匀分布，沿梯度线。

// 第七个表示平铺方式

// CLAMP重复最后一个颜色至最后

// MIRROR重复着色的图像水平或垂直方向已镜像方式填充会有翻转效果

// REPEAT重复着色的图像水平或垂直方向

mLinearGradient1 = new LinearGradient(0, 0, 0, 100, new int[] {

Color.RED, Color.GREEN, Color.BLUE, Color.WHITE }, null,

Shader.TileMode.CLAMP);

mLinearGradient2 = new LinearGradient(0, 0, 0, 100, new int[] {

Color.RED, Color.GREEN, Color.BLUE, Color.WHITE }, null,

Shader.TileMode.MIRROR);

mLinearGradient3 = new LinearGradient(0, 0, 0, 100, new int[] {

Color.RED, Color.GREEN, Color.BLUE, Color.WHITE }, null,

Shader.TileMode.REPEAT);

mPaint = new Paint();

new Thread(this).start();

}



@Override

protected void onDraw(Canvas canvas) {

// LinearGradient的高度只有100而绘制的矩形有200所以才会有重复

// 如果高度两者相同clamp重复是看不出效果的

Paint paint = new Paint();

paint.setTextSize(20);

paint.setColor(Color.WHITE);

// 绘制渐变的矩形

mPaint.setShader(mLinearGradient1);

canvas.drawRect(0, 0, 200, 200, mPaint);

canvas.drawText("CLAMP", 0, 200 + 20, paint);

// 绘制渐变的矩形

mPaint.setShader(mLinearGradient2);

canvas.drawRect(0, 250, 200, 450, mPaint);

canvas.drawText("MIRROR", 0, 450 + 20, paint);

// 绘制渐变的矩形

mPaint.setShader(mLinearGradient3);

canvas.drawRect(0, 500, 200, 700, mPaint);

canvas.drawText("REPEAT", 0, 700 + 20, paint);

}



@Override

public void run() {

while(!Thread.currentThread().isInterrupted()) {

try {

Thread.sleep(100);

}

catch(Exception e) {

Thread.currentThread().interrupt();

}

postInvalidate();

}

}

}

效果图



FRom http://blog.csdn.net/q445697127/article/details/7865504