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+/*
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+ * Copyright (C) 2008 ZXing authors
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+ *
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+ * Licensed under the Apache License, Version 2.0 (the "License");
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+ * you may not use this file except in compliance with the License.
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+ * You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+
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+package com.qingdaofushan.homecaresas.zxing.view;
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+
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+import android.content.Context;
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+import android.content.res.TypedArray;
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+import android.graphics.Bitmap;
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+import android.graphics.Canvas;
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+import android.graphics.ComposeShader;
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+import android.graphics.LinearGradient;
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+import android.graphics.Paint;
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+import android.graphics.PorterDuff;
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+import android.graphics.RadialGradient;
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+import android.graphics.Rect;
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+import android.graphics.RectF;
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+import android.graphics.Shader;
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+import android.graphics.SweepGradient;
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+import android.util.AttributeSet;
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+import android.view.View;
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+
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+import com.google.zxing.ResultPoint;
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+import com.qingdaofushan.homecaresas.R;
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+import com.qingdaofushan.homecaresas.zxing.camera.CameraManager;
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+
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+import java.util.Collection;
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+import java.util.HashSet;
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+
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+
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+/**
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+ * This view is overlaid on top of the camera preview. It adds the viewfinder rectangle and partial
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+ * transparency outside it, as well as the laser scanner animation and result points.
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+ *
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+ * @author dswitkin@google.com (Daniel Switkin)
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+ */
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+public final class ViewfinderView extends View {
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+
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+ private static final int[] SCANNER_ALPHA = {0, 64, 128, 192, 255, 192, 128, 64};
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+ private static final long ANIMATION_DELAY = 10L;
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+ private static final int OPAQUE = 0xFF;
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+ private static final int CORNER_RECT_WIDTH = 8; //扫描区边角的宽
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+ private static final int CORNER_RECT_HEIGHT = 40; //扫描区边角的高
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+ private static final int SCANNER_LINE_MOVE_DISTANCE = 5; //扫描线移动距离
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+ private static final int SCANNER_LINE_HEIGHT = 10; //扫描线宽度
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+
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+ private final Paint paint;
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+ private Bitmap resultBitmap;
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+ //模糊区域颜色
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+ private final int maskColor;
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+ private final int resultColor;
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+ //扫描区域边框颜色
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+ private final int frameColor;
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+ //扫描线颜色
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+ private final int laserColor;
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+ //四角颜色
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+ private final int cornerColor;
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+ //扫描点的颜色
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+ private final int resultPointColor;
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+ private int scannerAlpha;
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+ //扫描区域提示文本
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+ private final String labelText;
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+ //扫描区域提示文本颜色
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+ private final int labelTextColor;
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+ private final float labelTextSize;
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+
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+ public static int scannerStart = 0;
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+ public static int scannerEnd = 0;
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+
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+ private Collection<ResultPoint> possibleResultPoints;
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+ private Collection<ResultPoint> lastPossibleResultPoints;
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+
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+ // This constructor is used when the class is built from an XML resource.
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+ public ViewfinderView(Context context, AttributeSet attrs) {
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+ super(context, attrs);
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+
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+ //初始化自定义属性信息
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+ TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.ViewfinderView);
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+ laserColor = array.getColor(R.styleable.ViewfinderView_laser_color, 0x00FF00);
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+ cornerColor = array.getColor(R.styleable.ViewfinderView_corner_color, 0x00FF00);
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+ frameColor = array.getColor(R.styleable.ViewfinderView_frame_color, 0xFFFFFF);
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+ resultPointColor = array.getColor(R.styleable.ViewfinderView_result_point_color, 0xC0FFFF00);
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+ maskColor = array.getColor(R.styleable.ViewfinderView_mask_color, 0x60000000);
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+ resultColor = array.getColor(R.styleable.ViewfinderView_result_color, 0xB0000000);
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+ labelTextColor = array.getColor(R.styleable.ViewfinderView_label_text_color, 0x90FFFFFF);
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+ labelText = array.getString(R.styleable.ViewfinderView_label_text);
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+ labelTextSize = array.getFloat(R.styleable.ViewfinderView_label_text_size, 36f);
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+
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+ // Initialize these once for performance rather than calling them every time in onDraw().
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+ paint = new Paint();
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+ paint.setAntiAlias(true);
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+ scannerAlpha = 0;
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+ possibleResultPoints = new HashSet<ResultPoint>(5);
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+
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+
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+ }
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+
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+ @Override
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+ public void onDraw(Canvas canvas) {
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+ Rect frame = CameraManager.get().getFramingRect();
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+ if (frame == null) {
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+ return;
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+ }
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+ if (scannerStart == 0 || scannerEnd == 0) {
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+ scannerStart = frame.top;
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+ scannerEnd = frame.bottom;
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+ }
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+
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+ int width = canvas.getWidth();
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+ int height = canvas.getHeight();
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+ // Draw the exterior (i.e. outside the framing rect) darkened
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+ drawExterior(canvas, frame, width, height);
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+
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+
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+ if (resultBitmap != null) {
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+ // Draw the opaque result bitmap over the scanning rectangle
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+ paint.setAlpha(OPAQUE);
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+ canvas.drawBitmap(resultBitmap, frame.left, frame.top, paint);
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+ } else {
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+ // Draw a two pixel solid black border inside the framing rect
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+ drawFrame(canvas, frame);
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+ // 绘制边角
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+ drawCorner(canvas, frame);
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+ //绘制提示信息
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+ drawTextInfo(canvas, frame);
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+ // Draw a red "laser scanner" line through the middle to show decoding is active
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+ drawLaserScanner(canvas, frame);
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+
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+ Collection<ResultPoint> currentPossible = possibleResultPoints;
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+ Collection<ResultPoint> currentLast = lastPossibleResultPoints;
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+ if (currentPossible.isEmpty()) {
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+ lastPossibleResultPoints = null;
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+ } else {
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+ possibleResultPoints = new HashSet<ResultPoint>(5);
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+ lastPossibleResultPoints = currentPossible;
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+ paint.setAlpha(OPAQUE);
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+ paint.setColor(resultPointColor);
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+ for (ResultPoint point : currentPossible) {
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+ canvas.drawCircle(frame.left + point.getX(), frame.top + point.getY(), 6.0f, paint);
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+ }
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+ }
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+ if (currentLast != null) {
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+ paint.setAlpha(OPAQUE / 2);
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+ paint.setColor(resultPointColor);
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+ for (ResultPoint point : currentLast) {
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+ canvas.drawCircle(frame.left + point.getX(), frame.top + point.getY(), 3.0f, paint);
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+ }
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+ }
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+
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+ // Request another update at the animation interval, but only repaint the laser line,
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+ // not the entire viewfinder mask.
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+ //指定重绘区域,该方法会在子线程中执行
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+ postInvalidateDelayed(ANIMATION_DELAY, frame.left, frame.top, frame.right, frame.bottom);
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+ }
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+ }
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+
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+ //绘制文本
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+ private void drawTextInfo(Canvas canvas, Rect frame) {
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+ paint.setColor(labelTextColor);
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+ paint.setTextSize(labelTextSize);
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+ paint.setTextAlign(Paint.Align.CENTER);
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+ canvas.drawText(labelText, frame.left + frame.width() / 2, frame.bottom + CORNER_RECT_HEIGHT * 1.5f, paint);
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+ }
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+
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+
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+ //绘制边角
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+ private void drawCorner(Canvas canvas, Rect frame) {
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+ paint.setColor(cornerColor);
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+ //左上
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+ canvas.drawRect(frame.left, frame.top, frame.left + CORNER_RECT_WIDTH, frame.top + CORNER_RECT_HEIGHT, paint);
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+ canvas.drawRect(frame.left, frame.top, frame.left + CORNER_RECT_HEIGHT, frame.top + CORNER_RECT_WIDTH, paint);
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+ //右上
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+ canvas.drawRect(frame.right - CORNER_RECT_WIDTH, frame.top, frame.right, frame.top + CORNER_RECT_HEIGHT, paint);
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+ canvas.drawRect(frame.right - CORNER_RECT_HEIGHT, frame.top, frame.right, frame.top + CORNER_RECT_WIDTH, paint);
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+ //左下
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+ canvas.drawRect(frame.left, frame.bottom - CORNER_RECT_WIDTH, frame.left + CORNER_RECT_HEIGHT, frame.bottom, paint);
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+ canvas.drawRect(frame.left, frame.bottom - CORNER_RECT_HEIGHT, frame.left + CORNER_RECT_WIDTH, frame.bottom, paint);
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+ //右下
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+ canvas.drawRect(frame.right - CORNER_RECT_WIDTH, frame.bottom - CORNER_RECT_HEIGHT, frame.right, frame.bottom, paint);
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+ canvas.drawRect(frame.right - CORNER_RECT_HEIGHT, frame.bottom - CORNER_RECT_WIDTH, frame.right, frame.bottom, paint);
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+ }
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+
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+ //绘制扫描线
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+ private void drawLaserScanner(Canvas canvas, Rect frame) {
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+ paint.setColor(laserColor);
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+ //扫描线闪烁效果
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+// paint.setAlpha(SCANNER_ALPHA[scannerAlpha]);
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+// scannerAlpha = (scannerAlpha + 1) % SCANNER_ALPHA.length;
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+// int middle = frame.height() / 2 + frame.top;
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+// canvas.drawRect(frame.left + 2, middle - 1, frame.right - 1, middle + 2, paint);
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+ //线性渐变
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+ LinearGradient linearGradient = new LinearGradient(
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+ frame.left, scannerStart,
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+ frame.left, scannerStart + SCANNER_LINE_HEIGHT,
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+ shadeColor(laserColor),
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+ laserColor,
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+ Shader.TileMode.MIRROR);
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+
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+ RadialGradient radialGradient = new RadialGradient(
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+ (float) (frame.left + frame.width() / 2),
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+ (float) (scannerStart + SCANNER_LINE_HEIGHT / 2),
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+ 360f,
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+ laserColor,
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+ shadeColor(laserColor),
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+ Shader.TileMode.MIRROR);
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+
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+ SweepGradient sweepGradient = new SweepGradient(
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+ (float) (frame.left + frame.width() / 2),
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+ (float) (scannerStart + SCANNER_LINE_HEIGHT),
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+ shadeColor(laserColor),
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+ laserColor);
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+
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+ ComposeShader composeShader = new ComposeShader(radialGradient, linearGradient, PorterDuff.Mode.ADD);
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+
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+ paint.setShader(radialGradient);
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+ if (scannerStart <= scannerEnd) {
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+ //矩形
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+// canvas.drawRect(frame.left, scannerStart, frame.right, scannerStart + SCANNER_LINE_HEIGHT, paint);
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+ //椭圆
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+ RectF rectF = new RectF(frame.left + 2 * SCANNER_LINE_HEIGHT, scannerStart, frame.right - 2 * SCANNER_LINE_HEIGHT, scannerStart + SCANNER_LINE_HEIGHT);
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+ canvas.drawOval(rectF, paint);
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+ scannerStart += SCANNER_LINE_MOVE_DISTANCE;
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+ } else {
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+ scannerStart = frame.top;
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+ }
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+ paint.setShader(null);
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+ }
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+
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+ //处理颜色模糊
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+ public int shadeColor(int color) {
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+ String hax = Integer.toHexString(color);
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+ String result = "20" + hax.substring(2);
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+ return Integer.valueOf(result, 16);
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+ }
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+
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+ // 绘制扫描区边框 Draw a two pixel solid black border inside the framing rect
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+ private void drawFrame(Canvas canvas, Rect frame) {
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+ paint.setColor(frameColor);
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+ canvas.drawRect(frame.left, frame.top, frame.right + 1, frame.top + 2, paint);
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+ canvas.drawRect(frame.left, frame.top + 2, frame.left + 2, frame.bottom - 1, paint);
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+ canvas.drawRect(frame.right - 1, frame.top, frame.right + 1, frame.bottom - 1, paint);
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+ canvas.drawRect(frame.left, frame.bottom - 1, frame.right + 1, frame.bottom + 1, paint);
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+ }
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+
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+ // 绘制模糊区域 Draw the exterior (i.e. outside the framing rect) darkened
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+ private void drawExterior(Canvas canvas, Rect frame, int width, int height) {
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+ paint.setColor(resultBitmap != null ? resultColor : maskColor);
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+ canvas.drawRect(0, 0, width, frame.top, paint);
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+ canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint);
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+ canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint);
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+ canvas.drawRect(0, frame.bottom + 1, width, height, paint);
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+ }
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+
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+ public void drawViewfinder() {
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+ resultBitmap = null;
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+ invalidate();
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+ }
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+
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+ /**
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+ * Draw a bitmap with the result points highlighted instead of the live scanning display.
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+ *
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+ * @param barcode An image of the decoded barcode.
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+ */
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+ public void drawResultBitmap(Bitmap barcode) {
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+ resultBitmap = barcode;
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+ invalidate();
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+ }
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+
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+ public void addPossibleResultPoint(ResultPoint point) {
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+ possibleResultPoints.add(point);
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+ }
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+
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+}
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