Android渲染器Shader:环状放射渐变渲染器RadialGradient(三)

Android RadialGradient渲染器提供一种环状、发散、放射形状的渐变渲染器。

写一个例子:

package zhangphil.demo;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RadialGradient;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.view.View; /**
* Created by Phil on 2016/7/25.
*/ public class RadialGradientView extends View { private Paint mPaint = null;
private float radius=480;
private RadialGradient mRadialGradient = null; public RadialGradientView(Context context, AttributeSet attrs) {
super(context, attrs);
} @Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas); mRadialGradient = new RadialGradient(this.getWidth()/2, this.getHeight()/2, radius, new int[] {Color.RED, Color.TRANSPARENT,Color.BLACK}, null,Shader.TileMode.CLAMP); mPaint = new Paint();
mPaint.setAntiAlias(true); mPaint.setShader(mRadialGradient); canvas.drawCircle(this.getWidth() / 2, this.getHeight() / 2, radius, mPaint);
}
}

代码运行结果:

Android渲染器Shader:环状放射渐变渲染器RadialGradient(三)-LMLPHP

附录文章:

1,《Android渲染器Shader:LinearGradient(一)》链接:http://blog.csdn.net/zhangphil/article/details/52004027


2,《Android渲染器Shader:梯度渐变扫描渲染器SweepGradient(二)》链接:http://blog.csdn.net/zhangphil/article/details/52021677

05-11 20:12