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2014/10/15 ¤U¤È 10:04:29
iphone Programming Glossary: axisDrawing rotated text with NSString drawInRect http://stackoverflow.com/questions/10289898/drawing-rotated-text-with-nsstring-drawinrect alignment UIBaselineAdjustmentNone So when I use this I see text being drawn 45 degrees below the x axis. I want to draw the text vertically along my lineargradient. So I thought I could do that by using M_PI 2 for 90 degrees... seem to work like M_PI 4 and M_PI 8. I would think that if I used M_PI 4 it would have the text 45 degrees above the x axis and M_PI 2 would be 90 degrees below the x axis. But both turn up with nothing. Any thoughts thanks. iphone quartz graphics.. that if I used M_PI 4 it would have the text 45 degrees above the x axis and M_PI 2 would be 90 degrees below the x axis. But both turn up with nothing. Any thoughts thanks. iphone quartz graphics share improve this question I think what's..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage values for the alpha channel. Do I need to translate the co ordinates between UIKit and Core Graphics i.e is the y axis inverted Or have I misunderstood premultiplied alpha values Update @Nikolai Ruhe's suggestion was key to this. I did not.. iphone uikit core graphics quartz graphics share improve this question Yes CGContexts have their y axis pointing up while in UIKit it points down. See the docs . Edit after reading code You also want to set the blend mode to..
How do I add a gradient to the text of a UILabel, but not the background? http://stackoverflow.com/questions/1266179/how-do-i-add-a-gradient-to-the-text-of-a-uilabel-but-not-the-background does is it flips the drawing context vertically the iPhone inverts the normal Quartz coordinate system on for the Y axis sets the text drawing mode to intersect the drawn text with the clipping path clips the area to draw to the text and then..
iPhone development: pointer being freed was not allocated http://stackoverflow.com/questions/1424210/iphone-development-pointer-being-freed-was-not-allocated Adjust the coordinate system so that the origin is in the lower left corner of the view and the y axis points up CGContextTranslateCTM context2 0 sp.image.size.height CGContextScaleCTM context2 1.0 1.0 Create masked overlay.. Adjust the coordinate system so that the origin is in the lower left corner of the view and the y axis points up CGContextTranslateCTM context 0 sp.image.size.height CGContextScaleCTM context 1.0 1.0 Get the result of the blending..
How do I create/render a UIImage from a 3D transformed UIImageView? http://stackoverflow.com/questions/1949003/how-do-i-create-render-a-uiimage-from-a-3d-transformed-uiimageview the transform transform3D CATransform3DRotate transform3D DEGREES_TO_RADIANS degrees 1 0 0 perspective transform on y axis imageView.layer.transform transform3D FAIL capturing layer contents doesn't get the transformed image just the original.. the transform transform3D CATransform3DRotate transform3D DEGREES_TO_RADIANS degrees 1 0 0 perspective transform on y axis imageView.layer.transform transform3D UIImage captureView UIImageView view UIGraphicsBeginImageContext view.frame.size view.layer..
real time plotting on iPhone using core plot? http://stackoverflow.com/questions/2399836/real-time-plotting-on-iphone-using-core-plot need to adjust the plot range to track your data points for a moving ticker recalculate the new CPPlotRange for the X axis and set the plot space's xRange property to that. Use the CPTestApp iPhone AAPLot or StockPlot examples as templates for..
http://stackoverflow.com/questions/262156/uiimage-rounded-corners scaleFactor center the thumbnail in the frame. if wider than tall we need to adjust the vertical drawing point y axis if widthFactor heightFactor thumbnailPoint.y targetSize.height scaledHeight 0.5 else if widthFactor heightFactor thumbnailPoint.x..
Compensating compass lag with the gyroscope on iPhone 4 http://stackoverflow.com/questions/4212988/compensating-compass-lag-with-the-gyroscope-on-iphone-4 its on apple CM documentation Note not entirely isolated 3. if you have a gravity 0 it mean that the coresponding axis is perpendicular with gravity. gravity.z is the iPhone screen thats why it 9.82m s2 if you put on the desk with screen upright.. noise it's normal all sensor has a noise expecially cheap sensor . what i do on my apps is I will switch my reference axis to other axis in your case may be x or y for certain limits how the strategy is depend on the purpose or which side is your.. all sensor has a noise expecially cheap sensor . what i do on my apps is I will switch my reference axis to other axis in your case may be x or y for certain limits how the strategy is depend on the purpose or which side is your reference...
Getting displacement from accelerometer data with Core Motion http://stackoverflow.com/questions/4449565/getting-displacement-from-accelerometer-data-with-core-motion get it it will be very very cool Maybe you find these hints useful First of all to make things easy just look at one axis e.g x but consider both left x and right x to have a representable situation. Yes you are right you have to integrate twice..
Distance moved by Accelerometer http://stackoverflow.com/questions/6645126/distance-moved-by-accelerometer I want to move objects on iPhone screen rectangle circle and so on by moving iPhone. For example I move iPhone along X axis and the object moves along X axis. The same for Y Z axis. How can I do this Can I get algorithm for it Thank you. P.S I.. rectangle circle and so on by moving iPhone. For example I move iPhone along X axis and the object moves along X axis. The same for Y Z axis. How can I do this Can I get algorithm for it Thank you. P.S I looked for a while and seems like.. and so on by moving iPhone. For example I move iPhone along X axis and the object moves along X axis. The same for Y Z axis. How can I do this Can I get algorithm for it Thank you. P.S I looked for a while and seems like it is possible using accelerometer...
UIScrollView : paging horizontally, scrolling vertically? http://stackoverflow.com/questions/728014/uiscrollview-paging-horizontally-scrolling-vertically achieve this but a diagonal swipe still causes the view to scroll diagonally instead of restricting motion to a single axis. Edit to be clearer I'd like to allow the user to scroll horizontally OR vertically but not both simultaneously. iphone..
Is there a good charting library for iPhone? [closed] http://stackoverflow.com/questions/769749/is-there-a-good-charting-library-for-iphone stand Bar Charts Horizontal bar charts Double stacked bar charts Axis labels including rotated 90 degrees on the y axis Labels above each bar on the chart Shaded or custom backgrounds iphone cocoa touch cocoa charts core plot share improve.. long way since I first posted the summary. The framework now has bar charts including horizontal bar charts I believe axis labels including aribrarty rotations and fills and backgrounds for graphs. I'm not sure about stacked bar charts but it..
Safe update interval for startDeviceMotionUpdatesToQueue:withHandler:? http://stackoverflow.com/questions/11797857/safe-update-interval-for-startdevicemotionupdatestoqueuewithhandler motion NSError error myAcceleration motion.userAcceleration.y while self.stopButtonPressed NSLog @ Y Axis acceleration is f myAcceleration iphone objective c ios core motion cmmotionmanager share improve this question It..
Objective-C check if subviews of rotated UIViews intersect? http://stackoverflow.com/questions/15710853/objective-c-check-if-subviews-of-rotated-uiviews-intersect coordinate system the window coordinates . The converted points form two convex quadrilaterals. Use the SAT Separating Axis Theorem to check if the quadrilaterals intersect. This http www.geometrictools.com Documentation MethodOfSeparatingAxes.pdf.. is another description of the algorithm containing pseudo code more can be found by googling for Separating Axis Theorem . Update I have tried to create a Objective C method for the Separating Axis Theorem and this is what I got. Up.. found by googling for Separating Axis Theorem . Update I have tried to create a Objective C method for the Separating Axis Theorem and this is what I got. Up to now I did only a few tests so I hope that there are not too many errors. BOOL convexPolygon..
3D Door Open Animation between two UIViewControllers http://stackoverflow.com/questions/7685547/3d-door-open-animation-between-two-uiviewcontrollers . Here are some posts on this but I can't really see how to apply them to a 3D Door opener 3D Door but Axis in the middle 3D Unfolding iphone cocoa touch animation catransform3d share improve this question You have to apply..
Is there a good charting library for iPhone? [closed] http://stackoverflow.com/questions/769749/is-there-a-good-charting-library-for-iphone to add some details of requirements as they currently stand Bar Charts Horizontal bar charts Double stacked bar charts Axis labels including rotated 90 degrees on the y axis Labels above each bar on the chart Shaded or custom backgrounds iphone..
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