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;
// 線性漸變渲染
Shader mLinearGradient1 = null;
// 線性漸變渲染
Shader mLinearGradient2 = null;
// 線性漸變渲染
Shader mLinearGradient3 = null;
public myGameView(Context context) {
super(context);
// 建立LinearGradient并設定漸變顔色數組
// 第一個,第二個參數表示漸變起點 可以設定起點終點在對角等任意位置
// 第三個,第四個參數表示漸變終點
// 第五個參數表示漸變顔色
// 第六個參數可以為空,表示坐标,值為0-1 new float[] {0.25f, 0.5f, 0.75f, 1 }
// 如果這是空的,顔色均勻分布,沿梯度線。
// 第七個表示平鋪方式
// CLAMP重複最後一個顔色至最後
// MIRROR重複着色的圖像水準或垂直方向已鏡像方式填充會有翻轉效果
// REPEAT重複着色的圖像水準或垂直方向
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的高度隻有100而繪制的矩形有200是以才會有重複
// 如果高度兩者相同clamp重複是看不出效果的
Paint paint = new Paint();
paint.setTextSize(20);
paint.setColor(Color.WHITE);
// 繪制漸變的矩形
mPaint.setShader(mLinearGradient1);
canvas.drawRect(0, 0, 200, 200, mPaint);
canvas.drawText("CLAMP", 0, 200 + 20, paint);
// 繪制漸變的矩形
mPaint.setShader(mLinearGradient2);
canvas.drawRect(0, 250, 200, 450, mPaint);
canvas.drawText("MIRROR", 0, 450 + 20, paint);
// 繪制漸變的矩形
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();
}
}
}
效果圖
![](https://img.laitimes.com/img/9ZDMuAjOiMmIsIjOiQnIsIyZuBnLwUzMy8FM0cjMzkDN0MTMvwFNx8CX4AjMxAjMvw1ckF2bsBXdvwFdl5mLuR2cj5Set1yZtl2Lc9CX6MHc0RHaiojIsJye.png)