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2014/10/15 ¤U¤È 10:11:35
iphone Programming Glossary: multiplyhttp://stackoverflow.com/questions/1391589/cllocation-speed last poll and use the manual method also shown below to calculate the speed. Speed is calculated provided in m s so multiply by 3.6 for kph or 2.23693629 for mph. void locationManager CLLocationManager manager didUpdateToLocation CLLocation newLocation..
Is there a way to programmatically scroll to a PDF page within a UIWebView? http://stackoverflow.com/questions/1927841/is-there-a-way-to-programmatically-scroll-to-a-pdf-page-within-a-uiwebview
Changing my CALayer's anchorPoint moves the view http://stackoverflow.com/questions/1968017/changing-my-calayers-anchorpoint-moves-the-view adjust the layer's position to account for the new anchorPoint. One way I've done this is to grab the layer's bounds multiply the bounds' width and height by the old and new anchorPoint's normalized values take the difference of the two anchorPoints..
UITableView dequeueReusableCellWithIdentifier Theory http://stackoverflow.com/questions/3552343/uitableview-dequeuereusablecellwithidentifier-theory instead of allocating and I have a table view with let's say 4 cells with the same identifier all visible. How can it multiply itself into four instances without allocating I want to know this because I am building a calendar type component and all..
iPhone UIScrollView Speed Check http://stackoverflow.com/questions/3719753/iphone-uiscrollview-speed-check timeDiff currentTime lastOffsetCapture if timeDiff 0.1 CGFloat distance currentOffset.y lastOffset.y The multiply by 10 1000 isn't really necessary....... CGFloat scrollSpeedNotAbs distance 10 1000 in pixels per millisecond CGFloat scrollSpeed..
Get ppi of iPhone / iPad / iPod Touch at runtime http://stackoverflow.com/questions/3860305/get-ppi-of-iphone-ipad-ipod-touch-at-runtime for UIScreen says an unscaled point is about equal to 1 160th of an inch. So basically if you want the dpi you could multiply the scale by 160. float scale 1 if UIScreen mainScreen respondsToSelector @selector scale scale UIScreen mainScreen scale..
CoreGraphics for retina display http://stackoverflow.com/questions/4707465/coregraphics-for-retina-display CGImages don't take into account the Retina ness of your device so you have to do so yourself. To do that you need to multiply all of your coordinates and sizes that use in CoreGraphics routines by the input image's scale property which will be 2.0..
http://stackoverflow.com/questions/4894923/augmented-reality-movement need to divide the number of pixels of the screen between the degrees of the field view to get pixels per degree and multiply that by the offset of the object from your heading. This is easy stuff so I wrote an example project . It is not a library..
Proper way to instantiate an NSDecimalNumber from float or double http://stackoverflow.com/questions/5304855/proper-way-to-instantiate-an-nsdecimalnumber-from-float-or-double 36.76662445068359168 The reason I think for this precision loss is due to the involvement of the floating point multiply because the following code works fine id dn3 NSDecimalNumber decimalNumberWithMantissa 3676662445068359375L exponent 17..
Applying Zoom Effect In cocos2D gaming environment? http://stackoverflow.com/questions/5919180/applying-zoom-effect-in-cocos2d-gaming-environment pinchCenter Finally call the scale method to scale by the distanceDelta pass in the pinch center as well. Also multiply the delta by PINCH_ZOOM_MULTIPLIER to slow down the scale speed. A PINCH_ZOOM_MULTIPLIER of 0.005f works for me but experiment..
Performing iPhone optimization on externally downloaded PNGs http://stackoverflow.com/questions/640909/performing-iphone-optimization-on-externally-downloaded-pngs separately for each color. So you have two options Perform the same work that pngcrush does and swap ordering pre multiply alpha. The speed up may be due to one or both of these. After you have loaded your image you can create a new image from..
Is programmatically inverting the colors of an image possible? http://stackoverflow.com/questions/6672517/is-programmatically-inverting-the-colors-of-an-image-possible alpha here so we need to divide by the alpha channel if it isn't zero of course to get uninflected RGB. We multiply by 255 to keep precision while still using integers int r g b if linePointer 3 r linePointer 0 255 linePointer 3 g linePointer.. linePointer 3 b linePointer 2 255 linePointer 3 else r g b 0 perform the colour inversion r 255 r g 255 g b 255 b multiply by alpha again divide by 255 to undo the scaling before store the new values and advance the pointer we're reading pixel.. it runs through every pixel converting from premultiplied alpha to uninflected RGB inverting each channel separately multiplying by alpha again and storing back gets an image from the context and wraps it into a UIImage cleans up after itself and..
CoreAudio AudioTimeStamp.mHostTime clock frequency? http://stackoverflow.com/questions/675626/coreaudio-audiotimestamp-mhosttime-clock-frequency A little tip If you regularly need to convert time values to ticks it is usually depends on CPU faster to multiply than to divide double ns2HTimeFactor 1.0 hTime2nsFactor Now you can multiply by ns2HTimeFactor instead of dividing by hTime2nsFactor.. it is usually depends on CPU faster to multiply than to divide double ns2HTimeFactor 1.0 hTime2nsFactor Now you can multiply by ns2HTimeFactor instead of dividing by hTime2nsFactor . Of course it is a waste of time to re calculate the factors each..
Help calculating X and Y from Latitude and Longitude in iPhone http://stackoverflow.com/questions/6852195/help-calculating-x-and-y-from-latitude-and-longitude-in-iphone Using the law of cosines I can find the angle that will give my projections of X and Y but I can't find a scale to multiply correctly. I guess is because latitude and longitude are given in degrees and are non linear but I have such a small spot..
Accelerometer Low Pass Filtering http://stackoverflow.com/questions/6942626/accelerometer-low-pass-filtering work either. I'm fairly confused as to what these values mean. For example in the first part of the code why do they multiply the acceleration values by 10 To get a 'bigger' movement I could make some sense out of that but the second code with the.. question accelX acceleration.x kFilteringFactor accelX 1.0 kFilteringFactor Whats happening in this code you are multiplying the acceleration at the moment by the Filtering factor 0.1 and then adding it to the filtered acceleration of the last..
UILocalNotification Repeat Interval for Custom Alarm (sun, mon, tue, wed, thu, fri, sat) http://stackoverflow.com/questions/6966365/uilocalnotification-repeat-interval-for-custom-alarm-sun-mon-tue-wed-thu-f options are provided. The repeatInterval parameter is an enum type and it limited to specific values . You cannot multiply those enumerations and get multiples of those intervals. You cannot have more than 64 local notifications set in your app...
iPhone ImageMagick Library - converting from batch file script to Objective-C using MagickWand API http://stackoverflow.com/questions/7480812/iphone-imagemagick-library-converting-from-batch-file-script-to-objective-c-us convert.exe channel blue level 0 93 level 4.7 100 ^ convert.exe brightness contrast 5x3 ^ convert.exe fill.jpg compose multiply gravity center composite ^ convert.exe level 3.5 100 0.91 level 2.7 100 ^ convert.exe channel red level 3.5 100 ^ convert.exe..
Overlay Color Blend in OpenGL ES / iOS / Cocos2d http://stackoverflow.com/questions/8771413/overlay-color-blend-in-opengl-es-ios-cocos2d are not created by setting the blend function or mode but by texture environment or shader. The Overlay actually multiply effect corresponds to the GL_MODULATE texture environment mode. Or in terms of a shader gl_FragColor texture2D ... color..
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