content: /*
   * Copyright (C) 2008 ZXing authors
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.google.zxing.view;
  
  import android.content.Context;
  import android.content.res.Resources;
  import android.graphics.Bitmap;
  import android.graphics.BitmapFactory;
  import android.graphics.Canvas;
  import android.graphics.Color;
  import android.graphics.Paint;
  import android.graphics.Rect;
  import android.text.TextUtils;
  import android.util.AttributeSet;
  import android.util.TypedValue;
  import android.view.View;
  
  import com.google.zxing.ResultPoint;
  import com.jinlin.zxing.R;
  import com.google.zxing.camera.CameraManager;
  
  import java.util.Collection;
  import java.util.HashSet;
  
  /**
   * This view is overlaid on top of the camera preview. It adds the viewfinder
   * rectangle and partial transparency outside it, as well as the laser scanner
   * animation and result points.
   */
  public final class ViewfinderView extends View {
  
  	private static final int[] SCANNER_ALPHA = { 0, 64, 128, 192, 255, 192,
  			128, 64 };
  	private static final long ANIMATION_DELAY = 30L;
  	private static final int OPAQUE = 0xFF;
  
  	private final Paint paint;
  	private Bitmap resultBitmap;
  	private Bitmap tipBitmap;
  	private final int maskColor;
  	private final int resultColor;
  	private final int frameColor;
  	private final int laserColor;
  	private final int resultPointColor;
  	private int scannerAlpha;
  	private Collection<ResultPoint> possibleResultPoints;
  	private Collection<ResultPoint> lastPossibleResultPoints;
  	private int oneDip = 0;
  	private String tip_string = null;
  
  	// This constructor is used when the class is built from an XML resource.
  	public ViewfinderView(Context context, AttributeSet attrs) {
  		super(context, attrs);
  
  		// Initialize these once for performance rather than calling them every
  		// time in onDraw().
  		paint = new Paint();
  		Resources resources = getResources();
  		maskColor = resources.getColor(R.color.viewfinder_mask);
  		resultColor = resources.getColor(R.color.result_view);
  		frameColor = resources.getColor(R.color.viewfinder_frame);
  		laserColor = resources.getColor(R.color.viewfinder_laser);
  		resultPointColor = resources.getColor(R.color.possible_result_points);
  		tipBitmap = BitmapFactory.decodeResource(resources,
  				R.mipmap.btn_header_barcode);
  		oneDip = 1;
  		tip_string = resources.getString(R.string.capture_tips);
  		scannerAlpha = 0;
  		possibleResultPoints = new HashSet<>(5);
  	}
  
  	int middle = 0;
  	private Rect srcRact;
  	private Rect dstRect;
  	@Override
  	public void onDraw(Canvas canvas) {
  		Rect frame = CameraManager.get().getFramingRect();
  		if (frame == null) {
  			return;
  		}
  		int width = canvas.getWidth();
  		int height = canvas.getHeight();
  
  		// Draw the exterior (i.e. outside the framing rect) darkened
  		paint.setColor(resultBitmap != null ? resultColor : maskColor);
  		canvas.drawRect(0, 0, width, frame.top, paint);
  		canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
  		canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1,
  				paint);
  		canvas.drawRect(0, frame.bottom + 1, width, height, paint);
  
  		if (resultBitmap != null) {
  			// Draw the opaque result bitmap over the scanning rectangle
  			paint.setAlpha(OPAQUE);
  			canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
  		} else {
  
  			// Draw a two pixel solid black border inside the framing rect
  			paint.setColor(frameColor);
  			canvas.drawRect(frame.left, frame.top, frame.right + 1,
  					frame.top + 2, paint);
  			canvas.drawRect(frame.left, frame.top + 2, frame.left + 2,
  					frame.bottom - 1, paint);
  			canvas.drawRect(frame.right - 1, frame.top, frame.right + 1,
  					frame.bottom - 1, paint);
  			canvas.drawRect(frame.left, frame.bottom - 1, frame.right + 1,
  					frame.bottom + 1, paint);
  
  			//Draw the corner
  			paint.setColor(laserColor);
  			int cornerLength = 30;
  			int cornerWidth = 6;
  			
  			//左上角
  			canvas.drawRect(frame.left + 2, frame.top+2,frame.left+2+cornerLength+cornerWidth,
  					frame.top+2+cornerWidth, paint);
  			canvas.drawRect(frame.left + 2, frame.top+2+cornerWidth,frame.left+2+cornerWidth,
  					frame.top+2+cornerWidth+cornerLength, paint);//竖
  			//左下角
  			canvas.drawRect(frame.left + 2, frame.bottom-1-cornerWidth,frame.left+2+cornerLength+cornerWidth,
  					frame.bottom-1, paint);//横
  			canvas.drawRect(frame.left + 2, frame.bottom-1-cornerWidth-cornerLength,frame.left+2+cornerWidth,
  					frame.bottom-1-cornerWidth, paint);
  			
  			//右上角
  			canvas.drawRect(frame.right - 1-cornerWidth, frame.top+2+cornerWidth,frame.right-1,
  					frame.top+2+cornerWidth+cornerLength, paint);		//竖
  			canvas.drawRect(frame.right - 1 -cornerLength-cornerWidth, frame.top+2,frame.right-1,
  					frame.top+2+cornerWidth, paint);
  			//右下角
  			canvas.drawRect(frame.right - 1-cornerWidth, frame.bottom-1-cornerLength-cornerWidth,frame.right-1,
  					frame.bottom-1, paint);		//竖
  			canvas.drawRect(frame.right - 1 -cornerWidth-cornerLength, frame.bottom-1-cornerWidth,frame.right-1-cornerWidth,
  					frame.bottom-1, paint);
  			// Draw a red "laser scanner" line through the middle to show
  			// decoding is active
  			paint.setColor(laserColor);
  			paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
  			scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;
  //			 = frame.height() / 2 + frame.top;
  			if(middle>frame.bottom-2||middle<frame.top){
  				middle = frame.top+2;
  			}else{
  				middle+=5;
  			}
  			canvas.drawRect(frame.left + 2 + cornerWidth, middle - 2, frame.right - 1 - cornerWidth,
  					middle + 2, paint);
  
  			Collection<ResultPoint> currentPossible = possibleResultPoints;
  			Collection<ResultPoint> currentLast = lastPossibleResultPoints;
  			if (currentPossible.isEmpty()) {
  				lastPossibleResultPoints = null;
  			} else {
  				possibleResultPoints = new HashSet<>(5);
  				lastPossibleResultPoints = currentPossible;
  				paint.setAlpha(OPAQUE);
  				paint.setColor(resultPointColor);
  				for (ResultPoint point : currentPossible) {
  					canvas.drawCircle(frame.left + point.getX(), frame.top
  							+ point.getY(), 6.0f, paint);
  				}
  			}
  			if (currentLast != null) {
  				paint.setAlpha(OPAQUE / 2);
  				paint.setColor(resultPointColor);
  				for (ResultPoint point : currentLast) {
  					canvas.drawCircle(frame.left + point.getX(), frame.top
  							+ point.getY(), 3.0f, paint);
  				}
  			}
  
  			if (tipBitmap != null && !TextUtils.isEmpty(tip_string)) {
  				if(srcRact == null){
  					srcRact = new Rect();
  				}
  				srcRact.left = 0;
  				srcRact.right = 0;
  				srcRact.right = tipBitmap.getWidth();
  				srcRact.bottom = tipBitmap.getHeight();
  				
  				int dstBitmapSize = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, getResources().getDisplayMetrics());
  				int dstRectLeft =  width/5;
  				int dstRectTop = frame.bottom + (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, getResources().getDisplayMetrics())* oneDip;
  				
  				if(dstRect == null){
  					dstRect = new Rect();
  				}
  				
  				dstRect.left = dstRectLeft;
  				dstRect.top = dstRectTop;
  				dstRect.right = dstRectLeft + dstBitmapSize;
  				dstRect.bottom = dstRectTop + dstBitmapSize;
  				
  				canvas.drawBitmap(tipBitmap, srcRact,dstRect, paint);
  				paint.setColor(Color.parseColor("#80ffffff"));
  				paint.setTextSize(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 16, getResources().getDisplayMetrics()));
  				int left = dstRectLeft + dstBitmapSize + (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 5, getResources().getDisplayMetrics()) * oneDip;
  				int top = (int) (frame.bottom + (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, getResources().getDisplayMetrics())* oneDip
  						+ paint.getTextSize());
  				canvas.drawText(tip_string, left, top, paint);
  				paint.setColor(resultColor);
  			}
  
  			// Request another update at the animation interval, but only
  			// repaint the laser line,
  			// not the entire viewfinder mask.
  			postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top,
  					frame.right, frame.bottom);
  		}
  	}
  
  	public void drawViewfinder() {
  		resultBitmap = null;
  		invalidate();
  	}
  
  	/**
  	 * Draw a bitmap with the result points highlighted instead of the live
  	 * scanning display.
  	 * 
  	 * @param barcode
  	 *            An image of the decoded barcode.
  	 */
  	public void drawResultBitmap(Bitmap barcode) {
  		resultBitmap = barcode;
  		invalidate();
  	}
  
  	public void addPossibleResultPoint(ResultPoint point) {
  		possibleResultPoints.add(point);
  	}
  
  }
  