पिक्सेल

Question

द्वारा UIImage पिक्सेल की जांच करना मैं एक ऐसा ऐप्लिकेशन बना रहा हूं जिसमें मैं वर्तमान स्पर्श बिंदु का रंग प्राप्त करने की कोशिश कर रहा हूं, यदि यह बिंदु काला नहीं है तो यह एक पुनरावृत्ति/रिकर्सन चलाएगा और सभी गैर काले बिंदुओं को स्टोर करेगा सरणी। मैं पुनरावृत्ति के लिए इस समारोह का उपयोग कर रहा:

-(void)function:(CGFloat)positiveX:(CGFloat)positiveY:(CGFloat)negativeX:(CGFloat)negativeY 
{ 
    if (canDoPositiveX == YES) 
    { 
     //Checking in positive 
     if (![[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(positiveX, positiveY)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 1"]) 
     { 
      CGPoint point = CGPointMake(positiveX, positiveY); 
      [array addObject:[NSValue valueWithCGPoint:point]]; 
      [self function:positiveX+1 :positiveY :negativeX :negativeY]; 
     } 
     else 
     { 
      canDoPositiveX = NO; 
     } 
    } 

    if (canDoPositiveY == YES) 
    { 
     //Checking in positive 
     if (![[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(positiveX, positiveY)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 0"]) 
     { 
      CGPoint point = CGPointMake(positiveX, positiveY); 
      [array addObject:[NSValue valueWithCGPoint:point]]; 
      [self function:positiveX :positiveY+1 :negativeX :negativeY]; 
     } 
     else 
     { 
      canDoPositiveY = NO; 
     } 
    } 

    if (canDoNegativeX == YES) 
    { 
     //Checking in negative 
     if (![[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(negativeX, negativeY)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 1"]) 
     { 
      CGPoint point = CGPointMake(negativeX, negativeY); 
      [array addObject:[NSValue valueWithCGPoint:point]]; 
      [self function:positiveX :positiveY :negativeX-1 :negativeY]; 
     } 
     else 
     { 
      canDoNegativeX = NO; 
     } 
    } 

    if (canDoNegativeY == YES) 
    { 
     //Checking in negative   
     if (![[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(negativeX, negativeY)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 1"]) 
     { 
      negativeY -= 1; 
      CGPoint point = CGPointMake(negativeX, negativeY); 
      [array addObject:[NSValue valueWithCGPoint:point]]; 
      [self function:positiveX :positiveY :negativeX :negativeY-1]; 
     } 
     else 
     { 
      canDoNegativeY = NO; 
     } 
    } 

    NSLog(@"%u",[array count]); 

} 

अब, मैं उन बिंदुओं जो सरणी में हैं का रंग बदलने कर रहा हूँ, लेकिन यह केवल रंग अंक की सीधी रेखा, नहीं हर पिक्सेल। किसी भी मदद की वास्तव में सराहना की जाएगी। धन्यवाद!

Answer 1

इसे आजमाएं। मैं वास्तव में इसका परीक्षण नहीं कर सकता लेकिन इसे काम करना चाहिए।

-(void)function:(CGFloat)positiveX:(CGFloat)positiveY:(CGFloat)negativeX:(CGFloat)negativeY 
{ 
    // Check your current point 
    if ([[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(positiveX, positiveY)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 1"]) 
    { 
     // reached the dead end (break recursion) 
     return; 
    } 

    CGPoint point = CGPointMake(positiveX, positiveY); 
    [array addObject:[NSValue valueWithCGPoint:point]]; 

    BOOL canDoPositiveX = ![[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(positiveX+1, positiveY)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 1"]; 
    BOOL canDoPositiveY = ![[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(positiveX, positiveY+1)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 1"]; 
    BOOL canDoNegativeX = ![[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(positiveX-1, positiveY)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 1"]; 
    BOOL canDoNegativeY = ![[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(positiveX, positiveY-1)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 1"]; 

    if (canDoPositiveX == YES) 
    { 
     [self function:positiveX+1 :positiveY :negativeX :negativeY]; 
    } 

    if (canDoPositiveY == YES) 
    { 
     [self function:positiveX :positiveY+1 :negativeX :negativeY]; 
    } 

    if (canDoNegativeX == YES) 
    { 
     [self function:positiveX :positiveY :negativeX-1 :negativeY]; 
    } 

    if (canDoNegativeY == YES) 
    { 
     [self function:positiveX :positiveY :negativeX :negativeY-1]; 
    } 

    NSLog(@"%u",[array count]); 
} 

इसके अलावा इन चर अपनी कक्षा canDoPositiveX, canDoPositiveY, canDoNegativeX से, canDoNegativeY इस सवाल को दूर

Answer 2

की जांच:

How to get pixel data from a UIImage (Cocoa Touch) or CGImage (Core Graphics)?

आप आसानी से उपयोग करने के लिए सक्षम होना चाहिए/पर कोड को संशोधित दिए गए UIImage के लिए केवल काले (या लगभग काला) पिक्सेल निर्देशांक को वापस करने का स्वीकार्य उत्तर।

Answer 3

इस संशोधित कोड के साथ प्रयास करें:

-(void)function:(CGFloat)positiveX:(CGFloat)positiveY:(CGFloat)negativeX:(CGFloat)negativeY 
{ 
    if (canDoPositiveX == YES) 
    { 
     //Checking in positive 
     if (![[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(positiveX, positiveY)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 1"]) 
     { 
      CGPoint point = CGPointMake(positiveX, positiveY); 
      [array addObject:[NSValue valueWithCGPoint:point]]; 
      [self function:positiveX+1 :positiveY :negativeX :negativeY]; 
     } 
     else 
     { 
      canDoPositiveX = NO; 
      canDoPositiveY = YES; 
      canDoNegativeX = YES; 
      canDoNegativeY = YES; 
     } 
    } 

    if (canDoPositiveY == YES) 
    { 
     //Checking in positive 
     if (![[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(positiveX, positiveY)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 0"]) 
     { 
      CGPoint point = CGPointMake(positiveX, positiveY); 
      [array addObject:[NSValue valueWithCGPoint:point]]; 
      [self function:positiveX :positiveY+1 :negativeX :negativeY]; 
     } 
     else 
     { 
      canDoPositiveX = YES; 
      canDoPositiveY = NO; 
      canDoNegativeX = YES; 
      canDoNegativeY = YES; 
     } 
    } 

    if (canDoNegativeX == YES) 
    { 
     //Checking in negative 
     if (![[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(negativeX, negativeY)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 1"]) 
     { 
      CGPoint point = CGPointMake(negativeX, negativeY); 
      [array addObject:[NSValue valueWithCGPoint:point]]; 
      [self function:positiveX :positiveY :negativeX-1 :negativeY]; 
     } 
     else 
     { 
      canDoPositiveX = YES; 
      canDoPositiveY = YES; 
      canDoNegativeX = NO; 
      canDoNegativeY = YES; 
     } 
    } 

    if (canDoNegativeY == YES) 
    { 
     //Checking in negative   
     if (![[NSString stringWithFormat:@"%@",[self colorOfPoint:CGPointMake(negativeX, negativeY)]] isEqualToString:@"UIDeviceRGBColorSpace 0 0 0 1"]) 
     { 
      CGPoint point = CGPointMake(negativeX, negativeY); 
      [array addObject:[NSValue valueWithCGPoint:point]]; 
      [self function:positiveX :positiveY :negativeX :negativeY-1]; 
     } 
     else 
     { 
      canDoPositiveX = YES; 
      canDoPositiveY = YES; 
      canDoNegativeX = YES; 
      canDoNegativeY = NO; 
     } 
    } 

    NSLog(@"%u",[array count]); 
}