package com.yelong.medicalscience.widgets;

import android.annotation.SuppressLint;

import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PaintFlagsDrawFilter;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.RectF;import android.graphics.drawable.BitmapDrawable;import android.util.AttributeSet;import android.widget.ImageView;

public class ShapeImageView extends ImageView {

 public static final String TAG = "ShapeImageView";

 public static final int RECTANGLE = 0;

 public static final int ROUND_RECTANGLE = 1; public static final int CIRCLE = 2;

 /** 圆角矩形的四角弧度，单位是像素 */

 private static final int RADIUS_X = 10; private static final int RADIUS_Y = 10;

 private Bitmap mShapeBmp = null;

 private BitmapDrawable mBmpDrawable = null; private int mShape = ROUND_RECTANGLE; private int mRadiusX = RADIUS_X; private int mRadiusY = RADIUS_Y;

 private int mWidth;

 private int mHeight;

 // paint的遮罩层，canvas在绘制原图和下一张图时，两者的交互绘制模式（相交、合并、异或等）

 private PorterDuffXfermode xfermode = new PorterDuffXfermode(PorterDuff.Mode.SRC_IN); // Paint的标识绘制过滤器，用于设置图片绘制的抗锯齿效果 private PaintFlagsDrawFilter pdf = new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG);

 public ShapeImageView(Context context, AttributeSet attrs, int defStyle) {

  super(context, attrs, defStyle); }

 public ShapeImageView(Context context, AttributeSet attrs) {

  super(context, attrs); }

 public ShapeImageView(Context context) {

  super(context); }

 public int getShape() {

  return mShape; }

 public void setShape(int mShape) {

  this.mShape = mShape; }

 public int getRadiusX() {

  if (mShape == ROUND_RECTANGLE)   return mRadiusX;  else   return 0; }

 public int getRadiusY() {

  if (mShape == ROUND_RECTANGLE)   return mRadiusY;  else   return 0; }

 /**

  * 设置圆角矩形的弧度(当shape=ROUND_TANGLE才有效)  *   * @param mRadiusX  */ public void setRadius(int radiusX, int radiusY) {   if (mShape == ROUND_RECTANGLE) {    this.mRadiusX = radiusX;   this.mRadiusY = radiusY;  } }

 /**

  * 生成几何蒙版bitmap，即创建图片想要的几何形状（圆角、圆形等）的底板，用于与原图相交绘制  *   * @param w  * @param h  * @return  */ private Bitmap getShapeBitmap(int width, int height, Bitmap bitmapSrc, int shape) {   float widthScaleRatio, heightScaleRatio;// 缩放比例，用于缩放圆角，使显示的圆角总是XY半径相等  int bmpSrcWidth = bitmapSrc.getWidth();  int bmpSrcHeight = bitmapSrc.getHeight();  Bitmap bmpDst = Bitmap.createBitmap(bmpSrcWidth, bmpSrcHeight, Config.ARGB_8888);// 创建蒙板bitmap  Canvas canvas = new Canvas(bmpDst);// 创建蒙板画布  Paint p = new Paint(Paint.ANTI_ALIAS_FLAG);// 创建透明抗锯齿画笔  p.setColor(Color.parseColor("#ffffffff"));

  widthScaleRatio = (1.0f * bmpSrcWidth) / (1.0f * width);// 原图与目标bounds的缩放比例

  heightScaleRatio = (1.0f * bmpSrcHeight) / (1.0f * height);  canvas.setDrawFilter(pdf);

  // 根据shape值绘制不同的几何蒙版

  switch (shape) {   case ROUND_RECTANGLE:   canvas.drawRoundRect(new RectF(0, 0, bmpSrcWidth, bmpSrcHeight), mRadiusX * widthScaleRatio, mRadiusY * heightScaleRatio, p);// 绘制蒙版bitmap（PS：圆角的半径的单位是像素）   break;  case CIRCLE:   canvas.drawOval(new RectF(0, 0, bmpSrcWidth, bmpSrcHeight), p);// 绘制蒙版bitmap（PS：圆角的半径的单位是像素）   break;  default:   break;  }

  p.setXfermode(xfermode);

  canvas.drawBitmap(bitmapSrc, null, new RectF(0, 0, bmpSrcWidth, bmpSrcHeight), p);// 绘制原图并相交得出最终圆角图片  p.setXfermode(null);

  return bmpDst;

 }

 @SuppressLint("DrawAllocation")

 @SuppressWarnings("deprecation") @Override protected void onDraw(Canvas canvas) {

  if (getDrawable() instanceof BitmapDrawable && getDrawable() != null) {

   mBmpDrawable = (BitmapDrawable) getDrawable();   if (!mBmpDrawable.getBitmap().equals(mShapeBmp)) {     mWidth = getWidth();    mHeight = getHeight();    mShapeBmp = getShapeBitmap(mWidth, mHeight, mBmpDrawable.getBitmap(), mShape);    BitmapDrawable drawable = new BitmapDrawable(mShapeBmp);    setImageDrawable(drawable);    return;   }

  }

  super.onDraw(canvas);

 }

}