¡@
2014/10/15 ¤U¤È 10:07:04
iphone Programming Glossary: displacementFinding distance using accelerometer in iPhone http://stackoverflow.com/questions/10930007/finding-distance-using-accelerometer-in-iphone in this process of finding distance displaced by an iPhone. The requirement of accuracy in current system is in cm and displacement can be in 3D. What I have already done is 1. Tried using sound to calculated distance between between 2 iPhones but I need.. sound to calculated distance between between 2 iPhones but I need distance calculation with one iPhone only i.e need displacement. 2. Tried CMMotionManager and its accelerometer data but values received is helpless. I think I need a good filter to get..
Is there an easy way or library available to let text glow? http://stackoverflow.com/questions/1229721/is-there-an-easy-way-or-library-available-to-let-text-glow
UITableView: scrolling programmatically the content view http://stackoverflow.com/questions/3457900/uitableview-scrolling-programmatically-the-content-view
Getting displacement from accelerometer data with Core Motion http://stackoverflow.com/questions/4449565/getting-displacement-from-accelerometer-data-with-core-motion displacement from accelerometer data with Core Motion I am developing an augmented reality application that at the moment wants to display.. mat.m33 0 0 0 0 1 glMultMatrixf rotMat This works really well. More problems arise anyway when I try to find the displacement in space during an acceleration. The Apple Teapot example with Core Motion just adds the x y and z values of the acceleration.. userAcceleration.x translation.y userAcceleration.y translation.z userAcceleration.z What should I do to find out displacement from the acceleration in some istant with known time difference . Looking some other answers it seems like I have to integrate..
Quartz 2D/OpenGLES geometric distortions on images (preferrably using CGImage) http://stackoverflow.com/questions/459108/quartz-2d-opengles-geometric-distortions-on-images-preferrably-using-cgimage that the Core Image library for OSX has all these types of filters built in but not for the iPhone SDK. I can create a displacement map at a specific location and radius given the original source bitmap data but I'm not sure how to apply this bitmap data.. quartz graphics share improve this question Actually Flash 8's DisplacementMapFilter entry describes the general displacement map transformation given a displacement map made up of pixels component x y as follows dstPixel x y srcPixel x componentX.. Actually Flash 8's DisplacementMapFilter entry describes the general displacement map transformation given a displacement map made up of pixels component x y as follows dstPixel x y srcPixel x componentX x y 128 scaleX 256 y componentY x y 128..
Need to find Distance using Gyro+Accelerometer http://stackoverflow.com/questions/6647314/need-to-find-distance-using-gyroaccelerometer share improve this question Basic calculus behind this problem is in the expression and similar expressions for displacements in y and z and basic geometry is the Pythagorean theorem So once you have your accelerometer signals passed through a low.. accelerometer signals passed through a low pass filter and binned in time with sampling interval dt you can find the displacement in x as pardon my C... float dx 0.0f float vx 0.0f for int i 1 i n i vx acceleration_x i 1 acceleration_x i 2.0f dt dx vx.. contains x acceleration values from start to end of measurement at times 0 dt 2 dt 3 dt ... n 1 dt. To find the total displacement you just do dl sqrt dx dx dy dy dz dz Gyroscope is not necessary for this but if you are measuring linear distances you..
Using UIPinchGestureRecognizer to scale uiviews in single direction http://stackoverflow.com/questions/6759028/using-uipinchgesturerecognizer-to-scale-uiviews-in-single-direction delta is 1 gestureRecognizer.scale the delta is the multiplied by a factor so that it is somehow proportional to the displacement along the horizontal or vertical axis when the displacement is zero the delta scale is also zero when the displacement is.. by a factor so that it is somehow proportional to the displacement along the horizontal or vertical axis when the displacement is zero the delta scale is also zero when the displacement is equal along the two axis the scale delta is also equal along.. displacement along the horizontal or vertical axis when the displacement is zero the delta scale is also zero when the displacement is equal along the two axis the scale delta is also equal along the two axis I decided to divide by the distance but there..
Is there any way to remove the small bias along the gravity axis in the accelerometer data http://stackoverflow.com/questions/9074947/is-there-any-way-to-remove-the-small-bias-along-the-gravity-axis-in-the-accelero Otherwise you cannot remove the bias and the integration error will grow indefinitely. UPDATE You cannot get relative displacement just by integrating the acceleration see my answer to Android accelerometer accuracy Inertial navigation . However I give..
|