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/*
* Copyright 2012-2015 the original author or authors.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package de.pixart.messenger.ui.widget;
import android.content.Context;
import android.content.res.Resources;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Matrix.ScaleToFit;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Rect;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;
import com.google.zxing.ResultPoint;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import de.pixart.messenger.R;
/**
* @author Andreas Schildbach
*/
public class ScannerView extends View {
private static final long LASER_ANIMATION_DELAY_MS = 100l;
private static final int DOT_OPACITY = 0xa0;
private static final int DOT_TTL_MS = 500;
private final Paint maskPaint;
private final Paint laserPaint;
private final Paint dotPaint;
private final int maskColor, maskResultColor;
private final int laserColor;
private final int dotColor, dotResultColor;
private final Map<float[], Long> dots = new HashMap<float[], Long>(16);
private final Matrix matrix = new Matrix();
private boolean isResult;
private Rect frame;
public ScannerView(final Context context, final AttributeSet attrs) {
super(context, attrs);
final Resources res = getResources();
maskColor = res.getColor(R.color.black54);
maskResultColor = res.getColor(R.color.black87);
laserColor = res.getColor(R.color.red500);
dotColor = res.getColor(R.color.orange500);
dotResultColor = res.getColor(R.color.scan_result_dots);
maskPaint = new Paint();
maskPaint.setStyle(Style.FILL);
laserPaint = new Paint();
laserPaint.setStrokeWidth(res.getDimensionPixelSize(R.dimen.scan_laser_width));
laserPaint.setStyle(Style.STROKE);
dotPaint = new Paint();
dotPaint.setAlpha(DOT_OPACITY);
dotPaint.setStyle(Style.STROKE);
dotPaint.setStrokeWidth(res.getDimension(R.dimen.scan_dot_size));
dotPaint.setAntiAlias(true);
}
public void setFraming(final Rect frame, final RectF framePreview, final int displayRotation,
final int cameraRotation, final boolean cameraFlip) {
this.frame = frame;
matrix.setRectToRect(framePreview, new RectF(frame), ScaleToFit.FILL);
matrix.postRotate(-displayRotation, frame.exactCenterX(), frame.exactCenterY());
matrix.postScale(cameraFlip ? -1 : 1, 1, frame.exactCenterX(), frame.exactCenterY());
matrix.postRotate(cameraRotation, frame.exactCenterX(), frame.exactCenterY());
invalidate();
}
public void setIsResult(final boolean isResult) {
this.isResult = isResult;
invalidate();
}
public void addDot(final ResultPoint dot) {
dots.put(new float[]{dot.getX(), dot.getY()}, System.currentTimeMillis());
invalidate();
}
@Override
public void onDraw(final Canvas canvas) {
if (frame == null)
return;
final long now = System.currentTimeMillis();
final int width = canvas.getWidth();
final int height = canvas.getHeight();
final float[] point = new float[2];
// draw mask darkened
maskPaint.setColor(isResult ? maskResultColor : maskColor);
canvas.drawRect(0, 0, width, frame.top, maskPaint);
canvas.drawRect(0, frame.top, frame.left, frame.bottom + 1, maskPaint);
canvas.drawRect(frame.right + 1, frame.top, width, frame.bottom + 1, maskPaint);
canvas.drawRect(0, frame.bottom + 1, width, height, maskPaint);
if (isResult) {
laserPaint.setColor(dotResultColor);
laserPaint.setAlpha(160);
dotPaint.setColor(dotResultColor);
} else {
laserPaint.setColor(laserColor);
final boolean laserPhase = (now / 600) % 2 == 0;
laserPaint.setAlpha(laserPhase ? 160 : 255);
dotPaint.setColor(dotColor);
// schedule redraw
postInvalidateDelayed(LASER_ANIMATION_DELAY_MS);
}
canvas.drawRect(frame, laserPaint);
// draw points
for (final Iterator<Map.Entry<float[], Long>> i = dots.entrySet().iterator(); i.hasNext(); ) {
final Map.Entry<float[], Long> entry = i.next();
final long age = now - entry.getValue();
if (age < DOT_TTL_MS) {
dotPaint.setAlpha((int) ((DOT_TTL_MS - age) * 256 / DOT_TTL_MS));
matrix.mapPoints(point, entry.getKey());
canvas.drawPoint(point[0], point[1], dotPaint);
} else {
i.remove();
}
}
}
}
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