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：

附录文章：

1，《Android渲染器Shader：LinearGradient（一）》链接：

2，《Android渲染器Shader：梯度渐变扫描渲染器SweepGradient（二）》链接：