Android安卓经典设计学习例程源代码-ShaderSample.rar

package tjuci.edu.dl; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.ComposeShader; import android.graphics.LinearGradient; import android.graphics.Paint; import android.graphics.PorterDuff; import android.graphics.RadialGradient; import android.graphics.Shader; import android.graphics.Shader.TileMode; import android.graphics.SweepGradient; import android.util.AttributeSet; import android.view.View; public class MyView extends View { Bitmap b; Paint paint ; Shader shader; public MyView(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub b = BitmapFactory.decodeResource(getResources(), R.drawable.q7); } @Override protected void onDraw(Canvas canvas) { //位图 // shader = new BitmapShader(b, TileMode.REPEAT, TileMode.MIRROR); //线性 int[] colors = new int[]{ Color.RED,Color.GREEN,Color.BLUE }; // shader = new LinearGradient(0, 0, 100, 100, colors, null, TileMode.REPEAT); //圆形渐变 // shader = new RadialGradient(100, 100, 80, colors, null, TileMode.REPEAT); //角度渐变 // shader = new SweepGradient(160, 160, colors, null); //混合渐变 Shader shader1 = new LinearGradient(0, 0, 100, 100, colors, null, TileMode.REPEAT); Shader shader2 = new RadialGradient(100, 100, 80, colors, null, TileMode.REPEAT); shader = new ComposeShader(shader1, shader2, PorterDuff.Mode.DARKEN); paint = new Paint(); paint.setShader(shader); paint.setColor(Color.BLUE); canvas.drawRect(0, 0, 500, 500, paint); } }