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2014/10/15 ¤U¤È 10:05:33
iphone Programming Glossary: coordinatesRetrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage CGContextRelease context I then calculate the array index for the given alpha channel using the coordinates from the UIImageView. int byteIndex bytesPerRow uiViewPoint.y uiViewPoint.x bytesPerPixel unsigned char.. @Nikolai Ruhe's suggestion was key to this. I did not in fact need to translate between UIKit coordinates and Core Graphics coordinates. However after setting the blend mode my alpha values were what I expected.. was key to this. I did not in fact need to translate between UIKit coordinates and Core Graphics coordinates. However after setting the blend mode my alpha values were what I expected CGContextSetBlendMode context..
http://stackoverflow.com/questions/1166444/mkmapview-zoom-and-region 0 span latitudeDelta 8 longitudeDelta 6 The region could be described using its min and max coordinates as follows min coordinate lower left hand point latitude 4 longitude 3 max coordinate upper right hand..
UIImagePickerController and extracting EXIF data from existing photos http://stackoverflow.com/questions/1238838/uiimagepickercontroller-and-extracting-exif-data-from-existing-photos http code.google.com p iphone exif Gonna try it on my side. I'd like to get the GPS geotags coordinates from the picture that has been taken with the UIImagePickerController After a deeper look this library..
iOS 6 apps - how to deal with iPhone 5 screen size? [duplicate] http://stackoverflow.com/questions/12396545/ios-6-apps-how-to-deal-with-iphone-5-screen-size the iPhone 5 bigger screen size. As it has more pixels in height things like GCRectMake that use coordinates and just doubled the pixels with the retina non retina problem won't work seamlessly between versions..
How to retrieve user's current city name? http://stackoverflow.com/questions/1382900/how-to-retrieve-users-current-city-name this question What you have to do is setup a CLLocationManager that will find your current coordinates. With the current coordinates you need to use MKReverseGeoCoder to find your location. void viewDidLoad.. have to do is setup a CLLocationManager that will find your current coordinates. With the current coordinates you need to use MKReverseGeoCoder to find your location. void viewDidLoad this creates the CCLocationManager.. CLLocation oldLocation this creates a MKReverseGeocoder to find a placemark using the found coordinates MKReverseGeocoder geoCoder MKReverseGeocoder alloc initWithCoordinate newLocation.coordinate geoCoder.delegate..
iPhone image stretching (skew) http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew T . U 1 w' with appropriate P Q R S T U that maps the 4 points to the expected locations. 6 unique coordinates and 6 variables should have exactly 1 solution most of the cases. When you have found these 6 constants..
Drawing a route in mapkit in iphone sdk http://stackoverflow.com/questions/2834523/drawing-a-route-in-mapkit-in-iphone-sdk tell how to draw polylines on map. But most of the examples had a preloaded .csv file with various coordinates. Is there an alternate way to get the coordinates from Google or any other provider as the location.. examples had a preloaded .csv file with various coordinates. Is there an alternate way to get the coordinates from Google or any other provider as the location is selected dynamically. If NO how do I get the information.. as the location is selected dynamically. If NO how do I get the information for intermediate coordinates As I am a newbie please don't mind me asking this question. EDIT Does iOS 6 provide any direct way for..
Get PDF hyperlinks on iOS with Quartz http://stackoverflow.com/questions/4080373/get-pdf-hyperlinks-on-ios-with-quartz trans 1.0 1.0 rect CGRectApplyAffineTransform rect trans do whatever you need with the coordinates. e.g. you could create a button and put it on top of your page and use it to open the URL with UIApplication's..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file then render the individual elements of the view into the PDF. In other words use IB to specify coordinates fonts images etc. and write code to render various elements e.g. UILabel UIImageView etc. in a generic.. x 1100 my PDF was targeting 8.5 x 11 inches so this makes it easy to translate to from design time coordinates . In code I load the view UIView loadTemplate NSArray nib NSBundle mainBundle loadNibNamed @ ReportTemplate..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space I'm working on an iPhone app that uses OpenGL ES 2 for its drawing. I know that typically texture coordinates are defined in the 0 1 range but ideally I'd like to map them from 0 1023 the size of my TextureAtlas.. from 0 1023 the size of my TextureAtlas for readability's sake. I've seen sample code that defines coordinates in this manner but haven't been able to suss out what previous calls were made that allowed for this... between pixels. You however want to hit the pixels' centers. So you're interested in the texture coordinates 0 8 1 8 2 1 2 8 1 8 2 8 2 3 2 8 ... 7 8 8 8 2 15 2 8 Or more generally for pixel i in a N wide texture..
Store orientation to an array - and compare http://stackoverflow.com/questions/6368618/store-orientation-to-an-array-and-compare If you are using acceleration data you have 3 dimensional vectors at each time point the x y z coordinates. I would simply compute Dist i j SQRT A i X B j X ^2 A i Y B j Y ^2 A i Z B j Z ^2 that is the Eucledian..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage CGContextDrawImage context CGRectMake 0 0 width height image CGContextRelease context I then calculate the array index for the given alpha channel using the coordinates from the UIImageView. int byteIndex bytesPerRow uiViewPoint.y uiViewPoint.x bytesPerPixel unsigned char alpha rawData byteIndex 3 However I don't get the values.. Or have I misunderstood premultiplied alpha values Update @Nikolai Ruhe's suggestion was key to this. I did not in fact need to translate between UIKit coordinates and Core Graphics coordinates. However after setting the blend mode my alpha values were what I expected CGContextSetBlendMode context kCGBlendModeCopy iphone.. premultiplied alpha values Update @Nikolai Ruhe's suggestion was key to this. I did not in fact need to translate between UIKit coordinates and Core Graphics coordinates. However after setting the blend mode my alpha values were what I expected CGContextSetBlendMode context kCGBlendModeCopy iphone uikit core graphics quartz graphics..
http://stackoverflow.com/questions/1166444/mkmapview-zoom-and-region Here's a toy MKCoordinateRegion center latitude 0 longitude 0 span latitudeDelta 8 longitudeDelta 6 The region could be described using its min and max coordinates as follows min coordinate lower left hand point latitude 4 longitude 3 max coordinate upper right hand point latitude 4 longitude 3 So you can specify zoom levels..
UIImagePickerController and extracting EXIF data from existing photos http://stackoverflow.com/questions/1238838/uiimagepickercontroller-and-extracting-exif-data-from-existing-photos this question Have you took a look at this exif iPhone library http code.google.com p iphone exif Gonna try it on my side. I'd like to get the GPS geotags coordinates from the picture that has been taken with the UIImagePickerController After a deeper look this library seems to take NSData info as an input and the UIImagePickerController..
iOS 6 apps - how to deal with iPhone 5 screen size? [duplicate] http://stackoverflow.com/questions/12396545/ios-6-apps-how-to-deal-with-iphone-5-screen-size resolution I was just wondering with how should we deal with the iPhone 5 bigger screen size. As it has more pixels in height things like GCRectMake that use coordinates and just doubled the pixels with the retina non retina problem won't work seamlessly between versions as it happened when we got the Retina . And will we have to..
How to retrieve user's current city name? http://stackoverflow.com/questions/1382900/how-to-retrieve-users-current-city-name city name iphone objective c core location share improve this question What you have to do is setup a CLLocationManager that will find your current coordinates. With the current coordinates you need to use MKReverseGeoCoder to find your location. void viewDidLoad this creates the CCLocationManager that will find your current.. c core location share improve this question What you have to do is setup a CLLocationManager that will find your current coordinates. With the current coordinates you need to use MKReverseGeoCoder to find your location. void viewDidLoad this creates the CCLocationManager that will find your current location CLLocationManager.. manager didUpdateToLocation CLLocation newLocation fromLocation CLLocation oldLocation this creates a MKReverseGeocoder to find a placemark using the found coordinates MKReverseGeocoder geoCoder MKReverseGeocoder alloc initWithCoordinate newLocation.coordinate geoCoder.delegate self geoCoder start this delegate method is called..
iPhone image stretching (skew) http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew the transform P . . Q x x' . R . S y y' . . 1 . z z' . T . U 1 w' with appropriate P Q R S T U that maps the 4 points to the expected locations. 6 unique coordinates and 6 variables should have exactly 1 solution most of the cases. When you have found these 6 constants you can craft a CATransform3D . Notice the structure definition..
Drawing a route in mapkit in iphone sdk http://stackoverflow.com/questions/2834523/drawing-a-route-in-mapkit-in-iphone-sdk current location. I am aware of sites on the internet which tell how to draw polylines on map. But most of the examples had a preloaded .csv file with various coordinates. Is there an alternate way to get the coordinates from Google or any other provider as the location is selected dynamically. If NO how do I get the information.. which tell how to draw polylines on map. But most of the examples had a preloaded .csv file with various coordinates. Is there an alternate way to get the coordinates from Google or any other provider as the location is selected dynamically. If NO how do I get the information for intermediate coordinates As I am a newbie please.. way to get the coordinates from Google or any other provider as the location is selected dynamically. If NO how do I get the information for intermediate coordinates As I am a newbie please don't mind me asking this question. EDIT Does iOS 6 provide any direct way for this problem iphone mapkit share improve this question..
Get PDF hyperlinks on iOS with Quartz http://stackoverflow.com/questions/4080373/get-pdf-hyperlinks-on-ios-with-quartz trans 0 pageRect.size.height trans CGAffineTransformScale trans 1.0 1.0 rect CGRectApplyAffineTransform rect trans do whatever you need with the coordinates. e.g. you could create a button and put it on top of your page and use it to open the URL with UIApplication's openURL iphone ipad pdf quartz graphics share..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file load the view fill in any data e.g. set text for UILabels etc. then render the individual elements of the view into the PDF. In other words use IB to specify coordinates fonts images etc. and write code to render various elements e.g. UILabel UIImageView etc. in a generic way so you don't have to hard code everything. I used this.. I created a .xib file with a view and sized the view to 850 x 1100 my PDF was targeting 8.5 x 11 inches so this makes it easy to translate to from design time coordinates . In code I load the view UIView loadTemplate NSArray nib NSBundle mainBundle loadNibNamed @ ReportTemplate owner self options nil for id view in nib if view isKindOfClass..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space Texture Coordinates in Pixel Space I'm working on an iPhone app that uses OpenGL ES 2 for its drawing. I know that typically texture coordinates are defined in the 0 1 range but ideally I'd like to map them from 0 1023 the size of my TextureAtlas for readability's sake. I've seen sample code that defines.. defined in the 0 1 range but ideally I'd like to map them from 0 1023 the size of my TextureAtlas for readability's sake. I've seen sample code that defines coordinates in this manner but haven't been able to suss out what previous calls were made that allowed for this. glMatrixMode GL_TEXTURE seems like it might be involved but.. of the texture and in case of nearest filtering the border between pixels. You however want to hit the pixels' centers. So you're interested in the texture coordinates 0 8 1 8 2 1 2 8 1 8 2 8 2 3 2 8 ... 7 8 8 8 2 15 2 8 Or more generally for pixel i in a N wide texture the proper texture coordinate is 2i 1 2N However if you want..
Store orientation to an array - and compare http://stackoverflow.com/questions/6368618/store-orientation-to-an-array-and-compare angles rotation matrices quaternions as tc pointed that out. If you are using acceleration data you have 3 dimensional vectors at each time point the x y z coordinates. I would simply compute Dist i j SQRT A i X B j X ^2 A i Y B j Y ^2 A i Z B j Z ^2 that is the Eucledian distance between the two points. share improve this answer..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage 0 0 width height image CGContextRelease context I then calculate the array index for the given alpha channel using the coordinates from the UIImageView. int byteIndex bytesPerRow uiViewPoint.y uiViewPoint.x bytesPerPixel unsigned char alpha rawData byteIndex.. alpha values Update @Nikolai Ruhe's suggestion was key to this. I did not in fact need to translate between UIKit coordinates and Core Graphics coordinates. However after setting the blend mode my alpha values were what I expected CGContextSetBlendMode.. Ruhe's suggestion was key to this. I did not in fact need to translate between UIKit coordinates and Core Graphics coordinates. However after setting the blend mode my alpha values were what I expected CGContextSetBlendMode context kCGBlendModeCopy..
UIImagePickerController and extracting EXIF data from existing photos http://stackoverflow.com/questions/1238838/uiimagepickercontroller-and-extracting-exif-data-from-existing-photos this exif iPhone library http code.google.com p iphone exif Gonna try it on my side. I'd like to get the GPS geotags coordinates from the picture that has been taken with the UIImagePickerController After a deeper look this library seems to take NSData..
iOS 6 apps - how to deal with iPhone 5 screen size? [duplicate] http://stackoverflow.com/questions/12396545/ios-6-apps-how-to-deal-with-iphone-5-screen-size should we deal with the iPhone 5 bigger screen size. As it has more pixels in height things like GCRectMake that use coordinates and just doubled the pixels with the retina non retina problem won't work seamlessly between versions as it happened when..
How to retrieve user's current city name? http://stackoverflow.com/questions/1382900/how-to-retrieve-users-current-city-name location share improve this question What you have to do is setup a CLLocationManager that will find your current coordinates. With the current coordinates you need to use MKReverseGeoCoder to find your location. void viewDidLoad this creates the.. question What you have to do is setup a CLLocationManager that will find your current coordinates. With the current coordinates you need to use MKReverseGeoCoder to find your location. void viewDidLoad this creates the CCLocationManager that will find.. newLocation fromLocation CLLocation oldLocation this creates a MKReverseGeocoder to find a placemark using the found coordinates MKReverseGeocoder geoCoder MKReverseGeocoder alloc initWithCoordinate newLocation.coordinate geoCoder.delegate self geoCoder..
Get PDF hyperlinks on iOS with Quartz http://stackoverflow.com/questions/4080373/get-pdf-hyperlinks-on-ios-with-quartz trans CGAffineTransformScale trans 1.0 1.0 rect CGRectApplyAffineTransform rect trans do whatever you need with the coordinates. e.g. you could create a button and put it on top of your page and use it to open the URL with UIApplication's openURL ..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file text for UILabels etc. then render the individual elements of the view into the PDF. In other words use IB to specify coordinates fonts images etc. and write code to render various elements e.g. UILabel UIImageView etc. in a generic way so you don't.. the view to 850 x 1100 my PDF was targeting 8.5 x 11 inches so this makes it easy to translate to from design time coordinates . In code I load the view UIView loadTemplate NSArray nib NSBundle mainBundle loadNibNamed @ ReportTemplate owner self options..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space in Pixel Space I'm working on an iPhone app that uses OpenGL ES 2 for its drawing. I know that typically texture coordinates are defined in the 0 1 range but ideally I'd like to map them from 0 1023 the size of my TextureAtlas for readability's.. like to map them from 0 1023 the size of my TextureAtlas for readability's sake. I've seen sample code that defines coordinates in this manner but haven't been able to suss out what previous calls were made that allowed for this. glMatrixMode GL_TEXTURE.. filtering the border between pixels. You however want to hit the pixels' centers. So you're interested in the texture coordinates 0 8 1 8 2 1 2 8 1 8 2 8 2 3 2 8 ... 7 8 8 8 2 15 2 8 Or more generally for pixel i in a N wide texture the proper texture..
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