iphone/ZXingWidget/OverlayView.m

   1 /**
   2  * Copyright 2009 Jeff Verkoeyen
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  *    http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #import "OverlayView.h"
  18
  19 static const CGFloat kPadding = 10;
  20
  21 @implementation OverlayView
  22
  23 @synthesize delegate;
  24 @synthesize points = _points;
  25 //@synthesize image;
  26
  27
  28 ////////////////////////////////////////////////////////////////////////////////////////////////////
  29 - (id)initWithCancelEnabled:(BOOL)cancelEnabled frame:(CGRect)frame {
  30         if( self = [super initWithFrame:frame] ) {
  31                 self.backgroundColor = [UIColor clearColor];
  32         }
  33         if (cancelEnabled) {
  34                 cancelButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
  35                 [cancelButton setTitle:@"Cancel" forState:UIControlStateNormal];
  36                 [cancelButton setFrame:CGRectMake(95, 420, 130, 45)];
  37                 [cancelButton addTarget:self action:@selector(cancel:) forControlEvents:UIControlEventTouchUpInside];
  38                 [self addSubview:cancelButton];
  39         }
  40         return self;
  41 }
  42
  43 - (void)cancel:(id)sender {
  44         // call delegate to cancel this scanner
  45         if (delegate != nil) {
  46                 [delegate cancelled];
  47         }
  48 }
  49
  50 ////////////////////////////////////////////////////////////////////////////////////////////////////
  51 - (void) dealloc {
  52         [imageView release];
  53         imageView = nil;
  54         [_points release];
  55         _points = nil;
  56
  57         [super dealloc];
  58 }
  59
  60
  61 - (void)drawRect:(CGRect)rect inContext:(CGContextRef)context {
  62         CGContextBeginPath(context);
  63         CGContextMoveToPoint(context, rect.origin.x, rect.origin.y);
  64         CGContextAddLineToPoint(context, rect.origin.x + rect.size.width, rect.origin.y);
  65         CGContextAddLineToPoint(context, rect.origin.x + rect.size.width, rect.origin.y + rect.size.height);
  66         CGContextAddLineToPoint(context, rect.origin.x, rect.origin.y + rect.size.height);
  67         CGContextAddLineToPoint(context, rect.origin.x, rect.origin.y);
  68         CGContextStrokePath(context);
  69 }
  70
  71
  72 ////////////////////////////////////////////////////////////////////////////////////////////////////
  73 - (void)drawRect:(CGRect)rect {
  74         [super drawRect:rect];
  75         CGContextRef c = UIGraphicsGetCurrentContext();
  76
  77         CGRect cropRect = [self cropRect];
  78
  79         if (nil != _points) {
  80 //              [imageView.image drawAtPoint:cropRect.origin];
  81         }
  82
  83         CGFloat white[4] = {1.0f, 1.0f, 1.0f, 1.0f};
  84         CGContextSetStrokeColor(c, white);
  85         CGContextSetFillColor(c, white);
  86         [self drawRect:cropRect inContext:c];
  87
  88 //      CGContextSetStrokeColor(c, white);
  89         char *text = "Place a barcode inside the";
  90         char *text2 = "viewfinder rectangle to scan it.";
  91         //      CGContextSetStrokeColor(c, white);
  92         CGContextSaveGState(c);
  93         CGContextSelectFont(c, "Helvetica", 18, kCGEncodingMacRoman);
  94         CGContextScaleCTM(c, -1.0, 1.0);
  95         CGContextRotateCTM(c, 3.1415);
  96         CGContextShowTextAtPoint(c, 48.0, -45.0, text, 26);
  97         CGContextShowTextAtPoint(c, 33.0, -70.0, text2, 32);
  98         CGContextRestoreGState(c);
  99         if( nil != _points ) {
 100                 CGFloat blue[4] = {0.0f, 1.0f, 0.0f, 1.0f};
 101                 CGContextSetStrokeColor(c, blue);
 102                 CGContextSetFillColor(c, blue);
 103                 CGRect smallSquare = CGRectMake(0, 0, 10, 10);
 104                 for( NSValue* value in _points ) {
 105                         CGPoint point = [value CGPointValue];
 106                         NSLog(@"drawing point at %f, %f", point.x, point.y);
 107                         smallSquare.origin = CGPointMake(
 108                                                                                          cropRect.origin.x + point.x - smallSquare.size.width / 2,
 109                                                                                          cropRect.origin.y + point.y - smallSquare.size.height / 2);
 110                         [self drawRect:smallSquare inContext:c];
 111                 }
 112         }
 113 }
 114
 115
 116 ////////////////////////////////////////////////////////////////////////////////////////////////////
 117 /*
 118 - (void) setImage:(UIImage*)image {
 119         if( nil == _imageView ) {
 120                 _imageView = [[UIImageView alloc] initWithImage:image];
 121                 _imageView.alpha = 0.5;
 122         } else {
 123                 _imageView.image = image;
 124         }
 125
 126         CGRect frame = _imageView.frame;
 127         frame.origin.x = self.cropRect.origin.x;
 128         frame.origin.y = self.cropRect.origin.y;
 129         _imageView.frame = frame;
 130
 131         [_points release];
 132         _points = nil;
 133         self.backgroundColor = [UIColor clearColor];
 134
 135         [self setNeedsDisplay];
 136 }
 137 */
 138
 139 ////////////////////////////////////////////////////////////////////////////////////////////////////
 140 - (UIImage*) image {
 141         return imageView.image;
 142 }
 143
 144
 145 ////////////////////////////////////////////////////////////////////////////////////////////////////
 146 - (CGRect) cropRect {
 147         CGFloat rectSize = self.frame.size.width - kPadding * 2;
 148
 149         return CGRectMake(kPadding, (self.frame.size.height - rectSize) / 2, rectSize, rectSize);
 150 }
 151
 152
 153 ////////////////////////////////////////////////////////////////////////////////////////////////////
 154 - (void) setPoints:(NSArray*)pnts {
 155         [pnts retain];
 156         [_points release];
 157         _points = pnts;
 158
 159         if (pnts != nil) {
 160                 self.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.25];
 161         }
 162         [self setNeedsDisplay];
 163 }
 164
 165
 166 @end