作者:前方体育538 | 来源:互联网 | 2022-12-16 17:19
Android颜色处理(四)BitmapShader位图渲染publicBitmapShader(Bitmapbitmap,Shader.TileModetileX,Shader.Til
Android 颜色处理(四) BitmapShader位图渲染
![](https://www.#.com/imgs/3/9/8/7/33/151872ed75ee7b06113b7b1c26bb9a85.jpe)
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:
![](https://www.#.com/imgs/6/7/5/0/52/a01a583f73e3f24e8f9bfca5e39a98f4.jpe)
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);// 得到图像bitmap = ((BitmapDrawable) getResources().getDrawable(R.drawable.cat)).getBitmap();BitmapWidth = bitmap.getWidth();BitmapHeight = bitmap.getHeight();// 构造渲染器BitmapShaderbitmapShader = new BitmapShader(bitmap, Shader.TileMode.MIRROR,Shader.TileMode.REPEAT);}public BitmapShaderView(Context context,AttributeSet set) {super(context, set);}@Overrideprotected void onDraw(Canvas canvas) { // TODO Auto-generated method stubsuper.onDraw(canvas);//将图片裁剪为椭圆形 //构建ShapeDrawable对象并定义形状为椭圆 shapeDrawable = new ShapeDrawable(new OvalShape()); //得到画笔并设置渲染器 shapeDrawable.getPaint().setShader(bitmapShader); //设置显示区域 shapeDrawable.setBounds(20, 20,BitmapWidth-140,BitmapHeight); //绘制shapeDrawable shapeDrawable.draw(canvas); }}