iphone/ZXingWidget/Classes/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, oneDMode;
  24 @synthesize points = _points;
  25
  26
  27 ////////////////////////////////////////////////////////////////////////////////////////////////////
  28 - (id) initWithFrame:(CGRect)theFrame cancelEnabled:(BOOL)isCancelEnabled oneDMode:(BOOL)isOneDModeEnabled {
  29         if( self = [super initWithFrame:theFrame] ) {
  30                 self.backgroundColor = [UIColor clearColor];
  31     self.oneDMode = isOneDModeEnabled;
  32     if (isCancelEnabled) {
  33       cancelButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
  34       [cancelButton setTitle:@"Cancel" forState:UIControlStateNormal];
  35       if (oneDMode) {
  36         [cancelButton setTransform:CGAffineTransformMakeRotation(M_PI/2)];
  37         [cancelButton setFrame:CGRectMake(20, 175, 45, 130)];
  38       }
  39       else {
  40         [cancelButton setFrame:CGRectMake(95, 420, 130, 45)];
  41       }
  42
  43       [cancelButton addTarget:self action:@selector(cancel:) forControlEvents:UIControlEventTouchUpInside];
  44       [self addSubview:cancelButton];
  45     }
  46   }
  47         return self;
  48 }
  49
  50 - (void)cancel:(id)sender {
  51         // call delegate to cancel this scanner
  52         if (delegate != nil) {
  53                 [delegate cancelled];
  54         }
  55 }
  56
  57 ////////////////////////////////////////////////////////////////////////////////////////////////////
  58 - (void) dealloc {
  59         [imageView release];
  60         imageView = nil;
  61         [_points release];
  62         _points = nil;
  63         [cancelButton release];
  64         [super dealloc];
  65 }
  66
  67
  68 - (void)drawRect:(CGRect)rect inContext:(CGContextRef)context {
  69         CGContextBeginPath(context);
  70         CGContextMoveToPoint(context, rect.origin.x, rect.origin.y);
  71         CGContextAddLineToPoint(context, rect.origin.x + rect.size.width, rect.origin.y);
  72         CGContextAddLineToPoint(context, rect.origin.x + rect.size.width, rect.origin.y + rect.size.height);
  73         CGContextAddLineToPoint(context, rect.origin.x, rect.origin.y + rect.size.height);
  74         CGContextAddLineToPoint(context, rect.origin.x, rect.origin.y);
  75         CGContextStrokePath(context);
  76 }
  77
  78
  79 ////////////////////////////////////////////////////////////////////////////////////////////////////
  80 - (void)drawRect:(CGRect)rect {
  81         [super drawRect:rect];
  82         CGContextRef c = UIGraphicsGetCurrentContext();
  83
  84         CGRect cropRect = [self cropRect];
  85
  86         if (nil != _points) {
  87     //          [imageView.image drawAtPoint:cropRect.origin];
  88         }
  89
  90         CGFloat white[4] = {1.0f, 1.0f, 1.0f, 1.0f};
  91         CGContextSetStrokeColor(c, white);
  92         CGContextSetFillColor(c, white);
  93         [self drawRect:cropRect inContext:c];
  94
  95   //    CGContextSetStrokeColor(c, white);
  96         //      CGContextSetStrokeColor(c, white);
  97         CGContextSaveGState(c);
  98         if (oneDMode) {
  99                 char *text = "Place a red line over the bar code to be scanned.";
 100                 CGContextSelectFont(c, "Helvetica", 15, kCGEncodingMacRoman);
 101                 CGContextScaleCTM(c, -1.0, 1.0);
 102                 CGContextRotateCTM(c, M_PI/2);
 103                 CGContextShowTextAtPoint(c, 74.0, 285.0, text, 49);
 104         }
 105         else {
 106                 char *text = "Place a barcode inside the";
 107                 char *text2 = "viewfinder rectangle to scan it.";
 108                 CGContextSelectFont(c, "Helvetica", 18, kCGEncodingMacRoman);
 109                 CGContextScaleCTM(c, -1.0, 1.0);
 110                 CGContextRotateCTM(c, M_PI);
 111                 CGContextShowTextAtPoint(c, 48.0, -45.0, text, 26);
 112                 CGContextShowTextAtPoint(c, 33.0, -70.0, text2, 32);
 113         }
 114         CGContextRestoreGState(c);
 115         int offset = rect.size.width / 2;
 116         if (oneDMode) {
 117                 CGFloat red[4] = {1.0f, 0.0f, 0.0f, 1.0f};
 118                 CGContextSetStrokeColor(c, red);
 119                 CGContextSetFillColor(c, red);
 120                 CGContextBeginPath(c);
 121                 //              CGContextMoveToPoint(c, rect.origin.x + kPadding, rect.origin.y + offset);
 122                 //              CGContextAddLineToPoint(c, rect.origin.x + rect.size.width - kPadding, rect.origin.y + offset);
 123                 CGContextMoveToPoint(c, rect.origin.x + offset, rect.origin.y + kPadding);
 124                 CGContextAddLineToPoint(c, rect.origin.x + offset, rect.origin.y + rect.size.height - kPadding);
 125                 CGContextStrokePath(c);
 126         }
 127         if( nil != _points ) {
 128                 CGFloat blue[4] = {0.0f, 1.0f, 0.0f, 1.0f};
 129                 CGContextSetStrokeColor(c, blue);
 130                 CGContextSetFillColor(c, blue);
 131                 if (oneDMode) {
 132                         CGPoint val1 = [[_points objectAtIndex:0] CGPointValue];
 133                         CGPoint val2 = [[_points objectAtIndex:1] CGPointValue];
 134                         CGContextMoveToPoint(c, offset, val1.x);
 135                         CGContextAddLineToPoint(c, offset, val2.x);
 136                         CGContextStrokePath(c);
 137                 }
 138                 else {
 139                         CGRect smallSquare = CGRectMake(0, 0, 10, 10);
 140                         for( NSValue* value in _points ) {
 141                                 CGPoint point = [value CGPointValue];
 142                                 smallSquare.origin = CGPointMake(
 143                                          cropRect.origin.x + point.x - smallSquare.size.width / 2,
 144                                          cropRect.origin.y + point.y - smallSquare.size.height / 2);
 145                                 [self drawRect:smallSquare inContext:c];
 146                         }
 147                 }
 148         }
 149 }
 150
 151
 152 ////////////////////////////////////////////////////////////////////////////////////////////////////
 153 /*
 154  - (void) setImage:(UIImage*)image {
 155  if( nil == _imageView ) {
 156  _imageView = [[UIImageView alloc] initWithImage:image];
 157  _imageView.alpha = 0.5;
 158  } else {
 159  _imageView.image = image;
 160  }
 161
 162  CGRect frame = _imageView.frame;
 163  frame.origin.x = self.cropRect.origin.x;
 164  frame.origin.y = self.cropRect.origin.y;
 165  _imageView.frame = frame;
 166
 167  [_points release];
 168  _points = nil;
 169  self.backgroundColor = [UIColor clearColor];
 170
 171  [self setNeedsDisplay];
 172  }
 173  */
 174
 175 ////////////////////////////////////////////////////////////////////////////////////////////////////
 176 - (UIImage*) image {
 177         return imageView.image;
 178 }
 179
 180
 181 ////////////////////////////////////////////////////////////////////////////////////////////////////
 182 - (CGRect) cropRect {
 183         CGFloat rectSize = self.frame.size.width - kPadding * 2;
 184         if (!oneDMode) {
 185                 return CGRectMake(kPadding, (self.frame.size.height - rectSize) / 2, rectSize, rectSize);
 186         }
 187         else {
 188                 CGFloat rectSize2 = self.frame.size.height - kPadding * 2;
 189                 return CGRectMake(kPadding, kPadding, rectSize, rectSize2);
 190         }
 191 }
 192
 193
 194 ////////////////////////////////////////////////////////////////////////////////////////////////////
 195 - (void) setPoints:(NSArray*)pnts {
 196         [pnts retain];
 197         [_points release];
 198         _points = pnts;
 199
 200         if (pnts != nil) {
 201                 self.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.25];
 202         }
 203         [self setNeedsDisplay];
 204 }
 205
 206
 207 @end