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       [self addSubview:imageView];
  52     }
  53   }
  54         return self;
  55 }
  56
  57 - (void)cancel:(id)sender {
  58         // call delegate to cancel this scanner
  59         if (delegate != nil) {
  60                 [delegate cancelled];
  61         }
  62 }
  63
  64 ////////////////////////////////////////////////////////////////////////////////////////////////////
  65 - (void) dealloc {
  66         [imageView release];
  67         imageView = nil;
  68         [_points release];
  69         _points = nil;
  70         [super dealloc];
  71 }
  72
  73
  74 - (void)drawRect:(CGRect)rect inContext:(CGContextRef)context {
  75         CGContextBeginPath(context);
  76         CGContextMoveToPoint(context, rect.origin.x, rect.origin.y);
  77         CGContextAddLineToPoint(context, rect.origin.x + rect.size.width, rect.origin.y);
  78         CGContextAddLineToPoint(context, rect.origin.x + rect.size.width, rect.origin.y + rect.size.height);
  79         CGContextAddLineToPoint(context, rect.origin.x, rect.origin.y + rect.size.height);
  80         CGContextAddLineToPoint(context, rect.origin.x, rect.origin.y);
  81         CGContextStrokePath(context);
  82 }
  83
  84
  85 ////////////////////////////////////////////////////////////////////////////////////////////////////
  86 - (void)drawRect:(CGRect)rect {
  87         [super drawRect:rect];
  88         CGContextRef c = UIGraphicsGetCurrentContext();
  89
  90         CGRect cropRect = [self cropRect];
  91
  92         if (nil != _points) {
  93     //          [imageView.image drawAtPoint:cropRect.origin];
  94         }
  95
  96         CGFloat white[4] = {1.0f, 1.0f, 1.0f, 1.0f};
  97         CGContextSetStrokeColor(c, white);
  98         CGContextSetFillColor(c, white);
  99         [self drawRect:cropRect inContext:c];
 100
 101   //    CGContextSetStrokeColor(c, white);
 102         //      CGContextSetStrokeColor(c, white);
 103         CGContextSaveGState(c);
 104         if (oneDMode) {
 105                 char *text = "Place a red line over the bar code to be scanned.";
 106                 CGContextSelectFont(c, "Helvetica", 15, kCGEncodingMacRoman);
 107                 CGContextScaleCTM(c, -1.0, 1.0);
 108                 CGContextRotateCTM(c, M_PI/2);
 109                 CGContextShowTextAtPoint(c, 74.0, 285.0, text, 49);
 110         }
 111         else {
 112                 char *text = "Place a barcode inside the";
 113                 char *text2 = "viewfinder rectangle to scan it.";
 114                 CGContextSelectFont(c, "Helvetica", 18, kCGEncodingMacRoman);
 115                 CGContextScaleCTM(c, -1.0, 1.0);
 116                 CGContextRotateCTM(c, M_PI);
 117                 CGContextShowTextAtPoint(c, 48.0, -45.0, text, 26);
 118                 CGContextShowTextAtPoint(c, 33.0, -70.0, text2, 32);
 119         }
 120         CGContextRestoreGState(c);
 121         int offset = rect.size.width / 2;
 122         if (oneDMode) {
 123                 CGFloat red[4] = {1.0f, 0.0f, 0.0f, 1.0f};
 124                 CGContextSetStrokeColor(c, red);
 125                 CGContextSetFillColor(c, red);
 126                 CGContextBeginPath(c);
 127                 //              CGContextMoveToPoint(c, rect.origin.x + kPadding, rect.origin.y + offset);
 128                 //              CGContextAddLineToPoint(c, rect.origin.x + rect.size.width - kPadding, rect.origin.y + offset);
 129                 CGContextMoveToPoint(c, rect.origin.x + offset, rect.origin.y + kPadding);
 130                 CGContextAddLineToPoint(c, rect.origin.x + offset, rect.origin.y + rect.size.height - kPadding);
 131                 CGContextStrokePath(c);
 132         }
 133         if( nil != _points ) {
 134                 CGFloat blue[4] = {0.0f, 1.0f, 0.0f, 1.0f};
 135                 CGContextSetStrokeColor(c, blue);
 136                 CGContextSetFillColor(c, blue);
 137                 if (oneDMode) {
 138                         CGPoint val1 = [[_points objectAtIndex:0] CGPointValue];
 139                         CGPoint val2 = [[_points objectAtIndex:1] CGPointValue];
 140                         CGContextMoveToPoint(c, offset, val1.x);
 141                         CGContextAddLineToPoint(c, offset, val2.x);
 142                         CGContextStrokePath(c);
 143                 }
 144                 else {
 145                         CGRect smallSquare = CGRectMake(0, 0, 10, 10);
 146                         for( NSValue* value in _points ) {
 147                                 CGPoint point = [value CGPointValue];
 148                                 smallSquare.origin = CGPointMake(
 149                                          cropRect.origin.x + point.x - smallSquare.size.width / 2,
 150                                          cropRect.origin.y + point.y - smallSquare.size.height / 2);
 151                                 [self drawRect:smallSquare inContext:c];
 152                         }
 153                 }
 154         }
 155 }
 156
 157
 158 ////////////////////////////////////////////////////////////////////////////////////////////////////
 159 /*
 160  - (void) setImage:(UIImage*)image {
 161  //if( nil == imageView ) {
 162 // imageView = [[UIImageView alloc] initWithImage:image];
 163 // imageView.alpha = 0.5;
 164 // } else {
 165  imageView.image = image;
 166  //}
 167
 168  //CGRect frame = imageView.frame;
 169  //frame.origin.x = self.cropRect.origin.x;
 170  //frame.origin.y = self.cropRect.origin.y;
 171  //imageView.frame = CGRectMake(0,0, 30, 50);
 172
 173  //[_points release];
 174  //_points = nil;
 175  //self.backgroundColor = [UIColor clearColor];
 176
 177  //[self setNeedsDisplay];
 178  }
 179  */
 180
 181 ////////////////////////////////////////////////////////////////////////////////////////////////////
 182 - (UIImage*) image {
 183         return imageView.image;
 184 }
 185
 186
 187 ////////////////////////////////////////////////////////////////////////////////////////////////////
 188 - (CGRect) cropRect {
 189         CGFloat rectSize = self.frame.size.width - kPadding * 2;
 190         if (!oneDMode) {
 191                 return CGRectMake(kPadding, (self.frame.size.height - rectSize) / 2, rectSize, rectSize);
 192         }
 193         else {
 194                 CGFloat rectSize2 = self.frame.size.height - kPadding * 2;
 195                 return CGRectMake(kPadding, kPadding, rectSize, rectSize2);
 196         }
 197 }
 198
 199 /*
 200 - (void)viewDidLoad {
 201   self.imageView = [[UIImageView alloc] init];
 202   self.imageView.frame = CGRectMake(0, 0, 100, 100);
 203   [self addSubview:self.imageView];
 204
 205 }
 206 */
 207
 208 ////////////////////////////////////////////////////////////////////////////////////////////////////
 209 - (void) setPoints:(NSArray*)pnts {
 210         [pnts retain];
 211         [_points release];
 212         _points = pnts;
 213
 214         if (pnts != nil) {
 215                 self.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.25];
 216         }
 217         [self setNeedsDisplay];
 218 }
 219
 220
 221 @end