/* * 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.supermap.interfaces.ai.illegallypark; import android.annotation.SuppressLint; import android.content.Context; import android.content.res.Resources; import android.graphics.*; import android.util.AttributeSet; import android.view.View; import com.google.zxing.ResultPoint; import com.supermap.rnsupermap.R; import java.util.ArrayList; import java.util.List; /** * QR 扫描线 */ public final class QRfinderView extends View { private static final long ANIMATION_DELAY = 80L; private static final int CURRENT_POINT_OPACITY = 0xA0; private static final int MAX_RESULT_POINTS = 20; private static final int POINT_SIZE = 6; private final Paint paint; private Bitmap resultBitmap; private final int maskColor; // 取景框外的背景颜色 private final int resultColor;// result Bitmap的颜色 private final int resultPointColor; // 特征点的颜色 private final int statusColor; // 提示文字颜色 private List possibleResultPoints; private List lastPossibleResultPoints; // 扫描线移动的y private int scanLineTop; // 扫描线移动速度 private final int SCAN_VELOCITY = 20; // 扫描线 Bitmap scanLight; // frame为取景框 Rect frame; public QRfinderView(Context context, AttributeSet attrs) { super(context, attrs); // Initialize these once for performance rather than calling them every // time in onDraw(). paint = new Paint(Paint.ANTI_ALIAS_FLAG); Resources resources = getResources(); maskColor = resources.getColor(R.color.viewfinder_mask); resultColor = resources.getColor(R.color.result_view); resultPointColor = resources.getColor(R.color.possible_result_points); statusColor = resources.getColor(R.color.white); possibleResultPoints = new ArrayList(5); lastPossibleResultPoints = null; scanLight = BitmapFactory.decodeResource(resources, R.drawable.scan_light); } @SuppressLint("DrawAllocation") @Override public void onDraw(Canvas canvas) { Rect previewFrame = frame; if (frame == null || previewFrame == null) { return; } int width = canvas.getWidth(); int height = canvas.getHeight(); // 绘制取景框外的暗灰色的表面，分四个矩形绘制 paint.setColor(resultBitmap != null ? resultColor : maskColor); canvas.drawRect(0, 0, width, frame.top, paint);// Rect_1 canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, paint); // Rect_2 canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, paint); // Rect_3 canvas.drawRect(0, frame.bottom + 1, width, height, paint); // Rect_4 if (resultBitmap != null) { // Draw the opaque result bitmap over the scanning rectangle // 如果有二维码结果的Bitmap，在扫取景框内绘制不透明的result Bitmap paint.setAlpha(CURRENT_POINT_OPACITY); canvas.drawBitmap(resultBitmap, null, frame, paint); } else { drawFrameBounds(canvas, frame); drawStatusText(canvas, frame, width); drawScanLight(canvas, frame); float scaleX = frame.width() / (float) previewFrame.width(); float scaleY = frame.height() / (float) previewFrame.height(); // 绘制扫描线周围的特征点 List currentPossible = possibleResultPoints; List currentLast = lastPossibleResultPoints; int frameLeft = frame.left; int frameTop = frame.top; if (currentPossible.isEmpty()) { lastPossibleResultPoints = null; } else { possibleResultPoints = new ArrayList(5); lastPossibleResultPoints = currentPossible; paint.setAlpha(CURRENT_POINT_OPACITY); paint.setColor(resultPointColor); synchronized (currentPossible) { for (ResultPoint point : currentPossible) { canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX), frameTop + (int) (point.getY() * scaleY), POINT_SIZE, paint); } } } if (currentLast != null) { paint.setAlpha(CURRENT_POINT_OPACITY / 2); paint.setColor(resultPointColor); synchronized (currentLast) { float radius = POINT_SIZE / 2.0f; for (ResultPoint point : currentLast) { canvas.drawCircle(frameLeft + (int) (point.getX() * scaleX), frameTop + (int) (point.getY() * scaleY), radius, paint); } } } postInvalidateDelayed(ANIMATION_DELAY, frame.left - POINT_SIZE, frame.top - POINT_SIZE, frame.right + POINT_SIZE, frame.bottom + POINT_SIZE); } } /** * 绘制取景框边框 * * @param canvas * @param frame */ @SuppressWarnings("JavaDoc") private void drawFrameBounds(Canvas canvas, Rect frame) { paint.setColor(Color.WHITE); paint.setStrokeWidth(2); paint.setStyle(Paint.Style.STROKE); canvas.drawRect(frame, paint); paint.setColor(Color.BLUE); paint.setStyle(Paint.Style.FILL); int corWidth = 15; int corLength = 45; // 左上角 canvas.drawRect(frame.left - corWidth, frame.top, frame.left, frame.top + corLength, paint); canvas.drawRect(frame.left - corWidth, frame.top - corWidth, frame.left + corLength, frame.top, paint); // 右上角 canvas.drawRect(frame.right, frame.top, frame.right + corWidth, frame.top + corLength, paint); canvas.drawRect(frame.right - corLength, frame.top - corWidth, frame.right + corWidth, frame.top, paint); // 左下角 canvas.drawRect(frame.left - corWidth, frame.bottom - corLength, frame.left, frame.bottom, paint); canvas.drawRect(frame.left - corWidth, frame.bottom, frame.left + corLength, frame.bottom + corWidth, paint); // 右下角 canvas.drawRect(frame.right, frame.bottom - corLength, frame.right + corWidth, frame.bottom, paint); canvas.drawRect(frame.right - corLength, frame.bottom, frame.right + corWidth, frame.bottom + corWidth, paint); } /** * 绘制提示文字 * * @param canvas * @param frame * @param width */ private void drawStatusText(Canvas canvas, Rect frame, int width) { String statusText1 = "扫一扫"; int statusTextSize = 50; int statusPaddingTop = 40; paint.setColor(statusColor); paint.setTextSize(statusTextSize); int textWidth1 = (int) paint.measureText(statusText1); canvas.drawText(statusText1, (width - textWidth1) / 2, frame.top - statusPaddingTop, paint); } /** * 绘制移动扫描线 * * @param canvas * @param frame */ private void drawScanLight(Canvas canvas, Rect frame) { if (scanLineTop == 0) { scanLineTop = frame.top; } if (scanLineTop >= frame.bottom) { scanLineTop = frame.top; } else { scanLineTop += SCAN_VELOCITY; } Rect scanRect = new Rect(frame.left, scanLineTop, frame.right, scanLineTop + 30); canvas.drawBitmap(scanLight, null, scanRect, paint); } public void setFrame(Rect frame) { this.frame = frame; } }