zxing/iphone/ZXingWidget/Classes/OverlayView.m

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/**
* Copyright 2009 Jeff Verkoeyen
*
* 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.
*/
#import "OverlayView.h"
static const CGFloat kPadding = 10;
@implementation OverlayView
@synthesize delegate, oneDMode;
@synthesize points = _points;
////////////////////////////////////////////////////////////////////////////////////////////////////
- (id) initWithFrame:(CGRect)theFrame cancelEnabled:(BOOL)isCancelEnabled oneDMode:(BOOL)isOneDModeEnabled {
if( self = [super initWithFrame:theFrame] ) {
self.backgroundColor = [UIColor clearColor];
self.oneDMode = isOneDModeEnabled;
if (isCancelEnabled) {
cancelButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[cancelButton setTitle:@"Cancel" forState:UIControlStateNormal];
if (oneDMode) {
[cancelButton setTransform:CGAffineTransformMakeRotation(M_PI/2)];
[cancelButton setFrame:CGRectMake(20, 175, 45, 130)];
}
else {
[cancelButton setFrame:CGRectMake(95, 420, 130, 45)];
}
[cancelButton addTarget:self action:@selector(cancel:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:cancelButton];
}
}
return self;
}
- (void)cancel:(id)sender {
// call delegate to cancel this scanner
if (delegate != nil) {
[delegate cancelled];
}
}
////////////////////////////////////////////////////////////////////////////////////////////////////
- (void) dealloc {
[imageView release];
imageView = nil;
[_points release];
_points = nil;
[cancelButton release];
[super dealloc];
}
- (void)drawRect:(CGRect)rect inContext:(CGContextRef)context {
CGContextBeginPath(context);
CGContextMoveToPoint(context, rect.origin.x, rect.origin.y);
CGContextAddLineToPoint(context, rect.origin.x + rect.size.width, rect.origin.y);
CGContextAddLineToPoint(context, rect.origin.x + rect.size.width, rect.origin.y + rect.size.height);
CGContextAddLineToPoint(context, rect.origin.x, rect.origin.y + rect.size.height);
CGContextAddLineToPoint(context, rect.origin.x, rect.origin.y);
CGContextStrokePath(context);
}
////////////////////////////////////////////////////////////////////////////////////////////////////
- (void)drawRect:(CGRect)rect {
[super drawRect:rect];
CGContextRef c = UIGraphicsGetCurrentContext();
CGRect cropRect = [self cropRect];
if (nil != _points) {
// [imageView.image drawAtPoint:cropRect.origin];
}
CGFloat white[4] = {1.0f, 1.0f, 1.0f, 1.0f};
CGContextSetStrokeColor(c, white);
CGContextSetFillColor(c, white);
[self drawRect:cropRect inContext:c];
// CGContextSetStrokeColor(c, white);
// CGContextSetStrokeColor(c, white);
CGContextSaveGState(c);
if (oneDMode) {
char *text = "Place a red line over the bar code to be scanned.";
CGContextSelectFont(c, "Helvetica", 15, kCGEncodingMacRoman);
CGContextScaleCTM(c, -1.0, 1.0);
CGContextRotateCTM(c, M_PI/2);
CGContextShowTextAtPoint(c, 74.0, 285.0, text, 49);
}
else {
char *text = "Place a barcode inside the";
char *text2 = "viewfinder rectangle to scan it.";
CGContextSelectFont(c, "Helvetica", 18, kCGEncodingMacRoman);
CGContextScaleCTM(c, -1.0, 1.0);
CGContextRotateCTM(c, M_PI);
CGContextShowTextAtPoint(c, 48.0, -45.0, text, 26);
CGContextShowTextAtPoint(c, 33.0, -70.0, text2, 32);
}
CGContextRestoreGState(c);
int offset = rect.size.width / 2;
if (oneDMode) {
CGFloat red[4] = {1.0f, 0.0f, 0.0f, 1.0f};
CGContextSetStrokeColor(c, red);
CGContextSetFillColor(c, red);
CGContextBeginPath(c);
// CGContextMoveToPoint(c, rect.origin.x + kPadding, rect.origin.y + offset);
// CGContextAddLineToPoint(c, rect.origin.x + rect.size.width - kPadding, rect.origin.y + offset);
CGContextMoveToPoint(c, rect.origin.x + offset, rect.origin.y + kPadding);
CGContextAddLineToPoint(c, rect.origin.x + offset, rect.origin.y + rect.size.height - kPadding);
CGContextStrokePath(c);
}
if( nil != _points ) {
CGFloat blue[4] = {0.0f, 1.0f, 0.0f, 1.0f};
CGContextSetStrokeColor(c, blue);
CGContextSetFillColor(c, blue);
if (oneDMode) {
CGPoint val1 = [[_points objectAtIndex:0] CGPointValue];
CGPoint val2 = [[_points objectAtIndex:1] CGPointValue];
CGContextMoveToPoint(c, offset, val1.x);
CGContextAddLineToPoint(c, offset, val2.x);
CGContextStrokePath(c);
}
else {
CGRect smallSquare = CGRectMake(0, 0, 10, 10);
for( NSValue* value in _points ) {
CGPoint point = [value CGPointValue];
smallSquare.origin = CGPointMake(
cropRect.origin.x + point.x - smallSquare.size.width / 2,
cropRect.origin.y + point.y - smallSquare.size.height / 2);
[self drawRect:smallSquare inContext:c];
}
}
}
}
////////////////////////////////////////////////////////////////////////////////////////////////////
/*
- (void) setImage:(UIImage*)image {
if( nil == _imageView ) {
_imageView = [[UIImageView alloc] initWithImage:image];
_imageView.alpha = 0.5;
} else {
_imageView.image = image;
}
CGRect frame = _imageView.frame;
frame.origin.x = self.cropRect.origin.x;
frame.origin.y = self.cropRect.origin.y;
_imageView.frame = frame;
[_points release];
_points = nil;
self.backgroundColor = [UIColor clearColor];
[self setNeedsDisplay];
}
*/
////////////////////////////////////////////////////////////////////////////////////////////////////
- (UIImage*) image {
return imageView.image;
}
////////////////////////////////////////////////////////////////////////////////////////////////////
- (CGRect) cropRect {
CGFloat rectSize = self.frame.size.width - kPadding * 2;
if (!oneDMode) {
return CGRectMake(kPadding, (self.frame.size.height - rectSize) / 2, rectSize, rectSize);
}
else {
CGFloat rectSize2 = self.frame.size.height - kPadding * 2;
return CGRectMake(kPadding, kPadding, rectSize, rectSize2);
}
}
////////////////////////////////////////////////////////////////////////////////////////////////////
- (void) setPoints:(NSArray*)pnts {
[pnts retain];
[_points release];
_points = pnts;
if (pnts != nil) {
self.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.25];
}
[self setNeedsDisplay];
}
@end