android drawBitmapMesh()图片旗帜飘扬效果

来源：互联网发布：人工智能坏处英语作文编辑：程序博客网时间：2024/05/02 01:05

package com.moredo.drawbitamp;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.view.View;

@SuppressLint(“DrawAllocation”)
public class FlagGril extends View {
private Context mContext;///< 上下文环境
private Bitmap bm;///< 图片
private final int HEIGHT = 100;///< 竖着的网格数
private final int WIDTH = 100;///< 横着的网格数
private float[] orig,verts;///< 原始坐标点，改变后的坐标点
private int A = 30;///< 波动的力度
private float k = 1;
public FlagGril(Context context) {
super(context);
this.mContext = context;
bm = BitmapFactory.decodeResource(mContext.getResources(), R.drawable.gril);
orig = new float[(HEIGHT + 1) * (WIDTH + 1) * 2];
verts = new float[(HEIGHT + 1) * (WIDTH + 1) * 2];
///< 初始化坐标
initOrig();
}

private void initOrig(){    ///< 获取位图的宽高    float width = bm.getWidth();    float height = bm.getHeight();    int index = 0 ;    for(int y = 0 ; y <= HEIGHT ;y++)    {        ///< 纵坐标        float fy = height * y / HEIGHT;        for(int x = 0;x <= WIDTH ; x++)        {            ///< 横坐标            float fx = width * x / WIDTH ;            orig[index * 2 + 0] = verts[index * 2 +0] = fx;            ///< 在这里人为将坐标加100是为了让图像下移，避免扭曲后被屏幕遮挡            orig[index * 2 + 1] = verts[index * 2 + 1] = fy + 100;            index += 1;        }    }}/** * @fun 波动 * 改变纵坐标的值，横坐标不变 */private void flagWavr(){    for(int j = 0;j <= HEIGHT ;j++)    {        for(int i = 0 ; i <= WIDTH ;i++)        {            ///< 横坐标不变            verts[(j * (WIDTH + 1) + i) * 2 + 0] += 0;            float offsetY =                     (float) Math.sin((float)i / WIDTH * 2 * Math.PI +                            Math.PI  * k);            verts[(j * (WIDTH + 1) + i) * 2 + 1] =orig[(j * WIDTH + i) * 2 + 1] +offsetY *A;        }    }}@Overrideprotected void onDraw(Canvas canvas) {    // TODO Auto-generated method stub    flagWavr();    k += 0.1F;    canvas.drawBitmapMesh(bm, WIDTH, HEIGHT, verts, 0, null, 0, null);    invalidate();//  canvas.drawBitmap(bm, 0, 0, new Paint());}

}

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