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Android 颜色处理(四) BitmapShader位图渲染
public BitmapShader(Bitmap bitmap,Shader.TileMode tileX,Shader.TileMode tileY)
调用这个方法来产生一个画有一个位图的渲染器(Shader)。
bitmap 在渲染器内使用的位图
tileX The tiling mode for x to draw the bitmap in. 在位图上X方向渲染器平铺模式
tileY The tiling mode for y to draw the bitmap in. 在位图上Y方向渲染器平铺模式
TileMode:
CLAMP :如果渲染器超出原始边界范围,会复制范围内边缘染色。
REPEAT :横向和纵向的重复渲染器图片,平铺。
MIRROR :横向和纵向的重复渲染器图片,这个和REPEAT重复方式不一样,他是以镜像方式平铺。
首先看一下效果图:
还是直接上代码:
MainActivity:
- package com.tony.shader;
-
- import android.os.Bundle;
- import android.app.Activity;
-
- public class MainActivity extends Activity {
-
- private BitmapShaderView shaderView;
-
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
-
- shaderView = new BitmapShaderView(this);
- setContentView(shaderView);
-
- }
-
- }
BitmapShaderView:
- package com.tony.shader;
-
- import android.content.Context;
- import android.graphics.Bitmap;
- import android.graphics.BitmapShader;
- import android.graphics.Canvas;
- import android.graphics.Paint;
- import android.graphics.Shader;
- import android.graphics.drawable.BitmapDrawable;
- import android.graphics.drawable.ShapeDrawable;
- import android.graphics.drawable.shapes.OvalShape;
- import android.util.AttributeSet;
- import android.view.View;
-
- public class BitmapShaderView extends View {
-
- private BitmapShader bitmapShader = null;
- private Bitmap bitmap = null;
- private Paint paint = null;
- private ShapeDrawable shapeDrawable = null;
- private int BitmapWidth = 0;
- private int BitmapHeight = 0;
-
- public BitmapShaderView(Context context) {
- super(context);
-
-
- bitmap = ((BitmapDrawable) getResources().getDrawable(R.drawable.cat))
- .getBitmap();
- BitmapWidth = bitmap.getWidth();
- BitmapHeight = bitmap.getHeight();
-
- bitmapShader = new BitmapShader(bitmap, Shader.TileMode.MIRROR,Shader.TileMode.REPEAT);
- }
-
- public BitmapShaderView(Context context,AttributeSet set) {
- super(context, set);
- }
-
-
- @Override
- protected void onDraw(Canvas canvas) {
-
- super.onDraw(canvas);
-
-
- shapeDrawable = new ShapeDrawable(new OvalShape());
-
- shapeDrawable.getPaint().setShader(bitmapShader);
-
- shapeDrawable.setBounds(20, 20,BitmapWidth-140,BitmapHeight);
-
- shapeDrawable.draw(canvas);
- }
-
- }
Android 颜色渲染(四) BitmapShader位图渲染
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原文地址:http://www.cnblogs.com/Free-Thinker/p/5571855.html