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 @synthesize cropRect;
  32
  33 ////////////////////////////////////////////////////////////////////////////////////////////////////
  34 - (id) initWithFrame:(CGRect)theFrame cancelEnabled:(BOOL)isCancelEnabled oneDMode:(BOOL)isOneDModeEnabled {
  35   if( self = [super initWithFrame:theFrame] ) {
  36
  37     CGFloat rectSize = self.frame.size.width - kPadding * 2;
  38     if (!oneDMode) {
  39       cropRect = CGRectMake(kPadding, (self.frame.size.height - rectSize) / 2, rectSize, rectSize);
  40     } else {
  41       CGFloat rectSize2 = self.frame.size.height - kPadding * 2;
  42       cropRect = CGRectMake(kPadding, kPadding, rectSize, rectSize2);
  43     }
  44
  45     self.backgroundColor = [UIColor clearColor];
  46     self.oneDMode = isOneDModeEnabled;
  47     if (isCancelEnabled) {
  48       UIButton *butt = [UIButton buttonWithType:UIButtonTypeRoundedRect];
  49       self.cancelButton = butt;
  50       [cancelButton setTitle:@"Cancel" forState:UIControlStateNormal];
  51       if (oneDMode) {
  52         [cancelButton setTransform:CGAffineTransformMakeRotation(M_PI/2)];
  53         [cancelButton setFrame:CGRectMake(20, 175, 45, 130)];
  54       }
  55       else {
  56         [cancelButton setFrame:CGRectMake(95, 420, 130, 45)];
  57       }
  58
  59       [cancelButton addTarget:self action:@selector(cancel:) forControlEvents:UIControlEventTouchUpInside];
  60       [self addSubview:cancelButton];
  61       [self addSubview:imageView];
  62     }
  63   }
  64   return self;
  65 }
  66
  67 - (void)cancel:(id)sender {
  68         // call delegate to cancel this scanner
  69         if (delegate != nil) {
  70                 [delegate cancelled];
  71         }
  72 }
  73
  74 ////////////////////////////////////////////////////////////////////////////////////////////////////
  75 - (void) dealloc {
  76         [imageView release];
  77         [_points release];
  78         [super dealloc];
  79 }
  80
  81
  82 - (void)drawRect:(CGRect)rect inContext:(CGContextRef)context {
  83         CGContextBeginPath(context);
  84         CGContextMoveToPoint(context, rect.origin.x, rect.origin.y);
  85         CGContextAddLineToPoint(context, rect.origin.x + rect.size.width, rect.origin.y);
  86         CGContextAddLineToPoint(context, rect.origin.x + rect.size.width, rect.origin.y + rect.size.height);
  87         CGContextAddLineToPoint(context, rect.origin.x, rect.origin.y + rect.size.height);
  88         CGContextAddLineToPoint(context, rect.origin.x, rect.origin.y);
  89         CGContextStrokePath(context);
  90 }
  91
  92 - (CGPoint)map:(CGPoint)point {
  93     CGPoint center;
  94     center.x = cropRect.size.width/2;
  95     center.y = cropRect.size.height/2;
  96     float x = point.x - center.x;
  97     float y = point.y - center.y;
  98     int rotation = 90;
  99     switch(rotation) {
 100     case 0:
 101         point.x = x;
 102         point.y = y;
 103         break;
 104     case 90:
 105         point.x = -y;
 106         point.y = x;
 107         break;
 108     case 180:
 109         point.x = -x;
 110         point.y = -y;
 111         break;
 112     case 270:
 113         point.x = y;
 114         point.y = -x;
 115         break;
 116     }
 117     point.x = point.x + center.x;
 118     point.y = point.y + center.y;
 119     return point;
 120 }
 121
 122 ////////////////////////////////////////////////////////////////////////////////////////////////////
 123 - (void)drawRect:(CGRect)rect {
 124         [super drawRect:rect];
 125         CGContextRef c = UIGraphicsGetCurrentContext();
 126
 127         if (nil != _points) {
 128     //          [imageView.image drawAtPoint:cropRect.origin];
 129         }
 130
 131         CGFloat white[4] = {1.0f, 1.0f, 1.0f, 1.0f};
 132         CGContextSetStrokeColor(c, white);
 133         CGContextSetFillColor(c, white);
 134         [self drawRect:cropRect inContext:c];
 135
 136   //    CGContextSetStrokeColor(c, white);
 137         //      CGContextSetStrokeColor(c, white);
 138         CGContextSaveGState(c);
 139         if (oneDMode) {
 140                 char *text = "Place a red line over the bar code to be scanned.";
 141                 CGContextSelectFont(c, "Helvetica", 15, kCGEncodingMacRoman);
 142                 CGContextScaleCTM(c, -1.0, 1.0);
 143                 CGContextRotateCTM(c, M_PI/2);
 144                 CGContextShowTextAtPoint(c, 74.0, 285.0, text, 49);
 145         }
 146         else {
 147                 char *text = "Place a barcode inside the";
 148                 char *text2 = "viewfinder rectangle to scan it.";
 149                 CGContextSelectFont(c, "Helvetica", 18, kCGEncodingMacRoman);
 150                 CGContextScaleCTM(c, -1.0, 1.0);
 151                 CGContextRotateCTM(c, M_PI);
 152                 CGContextShowTextAtPoint(c, 48.0, -45.0, text, 26);
 153                 CGContextShowTextAtPoint(c, 33.0, -70.0, text2, 32);
 154         }
 155         CGContextRestoreGState(c);
 156         int offset = rect.size.width / 2;
 157         if (oneDMode) {
 158                 CGFloat red[4] = {1.0f, 0.0f, 0.0f, 1.0f};
 159                 CGContextSetStrokeColor(c, red);
 160                 CGContextSetFillColor(c, red);
 161                 CGContextBeginPath(c);
 162                 //              CGContextMoveToPoint(c, rect.origin.x + kPadding, rect.origin.y + offset);
 163                 //              CGContextAddLineToPoint(c, rect.origin.x + rect.size.width - kPadding, rect.origin.y + offset);
 164                 CGContextMoveToPoint(c, rect.origin.x + offset, rect.origin.y + kPadding);
 165                 CGContextAddLineToPoint(c, rect.origin.x + offset, rect.origin.y + rect.size.height - kPadding);
 166                 CGContextStrokePath(c);
 167         }
 168         if( nil != _points ) {
 169                 CGFloat blue[4] = {0.0f, 1.0f, 0.0f, 1.0f};
 170                 CGContextSetStrokeColor(c, blue);
 171                 CGContextSetFillColor(c, blue);
 172                 if (oneDMode) {
 173                         CGPoint val1 = [self map:[[_points objectAtIndex:0] CGPointValue]];
 174                         CGPoint val2 = [self map:[[_points objectAtIndex:1] CGPointValue]];
 175                         CGContextMoveToPoint(c, offset, val1.x);
 176                         CGContextAddLineToPoint(c, offset, val2.x);
 177                         CGContextStrokePath(c);
 178                 }
 179                 else {
 180                         CGRect smallSquare = CGRectMake(0, 0, 10, 10);
 181                         for( NSValue* value in _points ) {
 182                                 CGPoint point = [self map:[value CGPointValue]];
 183                                 smallSquare.origin = CGPointMake(
 184                                          cropRect.origin.x + point.x - smallSquare.size.width / 2,
 185                                          cropRect.origin.y + point.y - smallSquare.size.height / 2);
 186                                 [self drawRect:smallSquare inContext:c];
 187                         }
 188                 }
 189         }
 190 }
 191
 192
 193 ////////////////////////////////////////////////////////////////////////////////////////////////////
 194 /*
 195  - (void) setImage:(UIImage*)image {
 196  //if( nil == imageView ) {
 197 // imageView = [[UIImageView alloc] initWithImage:image];
 198 // imageView.alpha = 0.5;
 199 // } else {
 200  imageView.image = image;
 201  //}
 202
 203  //CGRect frame = imageView.frame;
 204  //frame.origin.x = self.cropRect.origin.x;
 205  //frame.origin.y = self.cropRect.origin.y;
 206  //imageView.frame = CGRectMake(0,0, 30, 50);
 207
 208  //[_points release];
 209  //_points = nil;
 210  //self.backgroundColor = [UIColor clearColor];
 211
 212  //[self setNeedsDisplay];
 213  }
 214  */
 215
 216 ////////////////////////////////////////////////////////////////////////////////////////////////////
 217 - (UIImage*) image {
 218         return imageView.image;
 219 }
 220
 221
 222 ////////////////////////////////////////////////////////////////////////////////////////////////////
 223 - (void) setPoints:(NSMutableArray*)pnts {
 224     [pnts retain];
 225     [_points release];
 226     _points = pnts;
 227
 228     if (pnts != nil) {
 229         self.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.25];
 230     }
 231     [self setNeedsDisplay];
 232 }
 233
 234 - (void) setPoint:(CGPoint)point {
 235     if (!_points) {
 236         _points = [[NSMutableArray alloc] init];
 237     }
 238     if (_points.count > 3) {
 239         [_points removeObjectAtIndex:0];
 240     }
 241     [_points addObject:[NSValue valueWithCGPoint:point]];
 242     [self setNeedsDisplay];
 243 }
 244
 245
 246 @end