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 @interface OverlayView()
  22 @property (nonatomic,assign) UIButton *cancelButton;
  23 @end
  24
  25
  26 @implementation OverlayView
  27
  28 @synthesize delegate, oneDMode;
  29 @synthesize points = _points;
  30 @synthesize cancelButton;
  31
  32 ////////////////////////////////////////////////////////////////////////////////////////////////////
  33 - (id) initWithFrame:(CGRect)theFrame cancelEnabled:(BOOL)isCancelEnabled oneDMode:(BOOL)isOneDModeEnabled {
  34         if( self = [super initWithFrame:theFrame] ) {
  35                 self.backgroundColor = [UIColor clearColor];
  36     self.oneDMode = isOneDModeEnabled;
  37     if (isCancelEnabled) {
  38       UIButton *butt = [UIButton buttonWithType:UIButtonTypeRoundedRect];
  39       self.cancelButton = butt;
  40       [cancelButton setTitle:@"Cancel" forState:UIControlStateNormal];
  41       if (oneDMode) {
  42         [cancelButton setTransform:CGAffineTransformMakeRotation(M_PI/2)];
  43         [cancelButton setFrame:CGRectMake(20, 175, 45, 130)];
  44       }
  45       else {
  46         [cancelButton setFrame:CGRectMake(95, 420, 130, 45)];
  47       }
  48
  49       [cancelButton addTarget:self action:@selector(cancel:) forControlEvents:UIControlEventTouchUpInside];
  50       [self addSubview:cancelButton];
  51     }
  52   }
  53         return self;
  54 }
  55
  56 - (void)cancel:(id)sender {
  57         // call delegate to cancel this scanner
  58         if (delegate != nil) {
  59                 [delegate cancelled];
  60         }
  61 }
  62
  63 ////////////////////////////////////////////////////////////////////////////////////////////////////
  64 - (void) dealloc {
  65         [imageView release];
  66         imageView = nil;
  67         [_points release];
  68         _points = nil;
  69         [super dealloc];
  70 }
  71
  72
  73 - (void)drawRect:(CGRect)rect inContext:(CGContextRef)context {
  74         CGContextBeginPath(context);
  75         CGContextMoveToPoint(context, rect.origin.x, rect.origin.y);
  76         CGContextAddLineToPoint(context, rect.origin.x + rect.size.width, rect.origin.y);
  77         CGContextAddLineToPoint(context, rect.origin.x + rect.size.width, rect.origin.y + rect.size.height);
  78         CGContextAddLineToPoint(context, rect.origin.x, rect.origin.y + rect.size.height);
  79         CGContextAddLineToPoint(context, rect.origin.x, rect.origin.y);
  80         CGContextStrokePath(context);
  81 }
  82
  83
  84 ////////////////////////////////////////////////////////////////////////////////////////////////////
  85 - (void)drawRect:(CGRect)rect {
  86         [super drawRect:rect];
  87         CGContextRef c = UIGraphicsGetCurrentContext();
  88
  89         CGRect cropRect = [self cropRect];
  90
  91         if (nil != _points) {
  92     //          [imageView.image drawAtPoint:cropRect.origin];
  93         }
  94
  95         CGFloat white[4] = {1.0f, 1.0f, 1.0f, 1.0f};
  96         CGContextSetStrokeColor(c, white);
  97         CGContextSetFillColor(c, white);
  98         [self drawRect:cropRect inContext:c];
  99
 100   //    CGContextSetStrokeColor(c, white);
 101         //      CGContextSetStrokeColor(c, white);
 102         CGContextSaveGState(c);
 103         if (oneDMode) {
 104                 char *text = "Place a red line over the bar code to be scanned.";
 105                 CGContextSelectFont(c, "Helvetica", 15, kCGEncodingMacRoman);
 106                 CGContextScaleCTM(c, -1.0, 1.0);
 107                 CGContextRotateCTM(c, M_PI/2);
 108                 CGContextShowTextAtPoint(c, 74.0, 285.0, text, 49);
 109         }
 110         else {
 111                 char *text = "Place a barcode inside the";
 112                 char *text2 = "viewfinder rectangle to scan it.";
 113                 CGContextSelectFont(c, "Helvetica", 18, kCGEncodingMacRoman);
 114                 CGContextScaleCTM(c, -1.0, 1.0);
 115                 CGContextRotateCTM(c, M_PI);
 116                 CGContextShowTextAtPoint(c, 48.0, -45.0, text, 26);
 117                 CGContextShowTextAtPoint(c, 33.0, -70.0, text2, 32);
 118         }
 119         CGContextRestoreGState(c);
 120         int offset = rect.size.width / 2;
 121         if (oneDMode) {
 122                 CGFloat red[4] = {1.0f, 0.0f, 0.0f, 1.0f};
 123                 CGContextSetStrokeColor(c, red);
 124                 CGContextSetFillColor(c, red);
 125                 CGContextBeginPath(c);
 126                 //              CGContextMoveToPoint(c, rect.origin.x + kPadding, rect.origin.y + offset);
 127                 //              CGContextAddLineToPoint(c, rect.origin.x + rect.size.width - kPadding, rect.origin.y + offset);
 128                 CGContextMoveToPoint(c, rect.origin.x + offset, rect.origin.y + kPadding);
 129                 CGContextAddLineToPoint(c, rect.origin.x + offset, rect.origin.y + rect.size.height - kPadding);
 130                 CGContextStrokePath(c);
 131         }
 132         if( nil != _points ) {
 133                 CGFloat blue[4] = {0.0f, 1.0f, 0.0f, 1.0f};
 134                 CGContextSetStrokeColor(c, blue);
 135                 CGContextSetFillColor(c, blue);
 136                 if (oneDMode) {
 137                         CGPoint val1 = [[_points objectAtIndex:0] CGPointValue];
 138                         CGPoint val2 = [[_points objectAtIndex:1] CGPointValue];
 139                         CGContextMoveToPoint(c, offset, val1.x);
 140                         CGContextAddLineToPoint(c, offset, val2.x);
 141                         CGContextStrokePath(c);
 142                 }
 143                 else {
 144                         CGRect smallSquare = CGRectMake(0, 0, 10, 10);
 145                         for( NSValue* value in _points ) {
 146                                 CGPoint point = [value CGPointValue];
 147                                 smallSquare.origin = CGPointMake(
 148                                          cropRect.origin.x + point.x - smallSquare.size.width / 2,
 149                                          cropRect.origin.y + point.y - smallSquare.size.height / 2);
 150                                 [self drawRect:smallSquare inContext:c];
 151                         }
 152                 }
 153         }
 154 }
 155
 156
 157 ////////////////////////////////////////////////////////////////////////////////////////////////////
 158 /*
 159  - (void) setImage:(UIImage*)image {
 160  if( nil == _imageView ) {
 161  _imageView = [[UIImageView alloc] initWithImage:image];
 162  _imageView.alpha = 0.5;
 163  } else {
 164  _imageView.image = image;
 165  }
 166
 167  CGRect frame = _imageView.frame;
 168  frame.origin.x = self.cropRect.origin.x;
 169  frame.origin.y = self.cropRect.origin.y;
 170  _imageView.frame = frame;
 171
 172  [_points release];
 173  _points = nil;
 174  self.backgroundColor = [UIColor clearColor];
 175
 176  [self setNeedsDisplay];
 177  }
 178  */
 179
 180 ////////////////////////////////////////////////////////////////////////////////////////////////////
 181 - (UIImage*) image {
 182         return imageView.image;
 183 }
 184
 185
 186 ////////////////////////////////////////////////////////////////////////////////////////////////////
 187 - (CGRect) cropRect {
 188         CGFloat rectSize = self.frame.size.width - kPadding * 2;
 189         if (!oneDMode) {
 190                 return CGRectMake(kPadding, (self.frame.size.height - rectSize) / 2, rectSize, rectSize);
 191         }
 192         else {
 193                 CGFloat rectSize2 = self.frame.size.height - kPadding * 2;
 194                 return CGRectMake(kPadding, kPadding, rectSize, rectSize2);
 195         }
 196 }
 197
 198
 199 ////////////////////////////////////////////////////////////////////////////////////////////////////
 200 - (void) setPoints:(NSArray*)pnts {
 201         [pnts retain];
 202         [_points release];
 203         _points = pnts;
 204
 205         if (pnts != nil) {
 206                 self.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.25];
 207         }
 208         [self setNeedsDisplay];
 209 }
 210
 211
 212 @end