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2014/10/15 ¤U¤È 10:12:27
iphone Programming Glossary: p1Objective-C check if subviews of rotated UIViews intersect? http://stackoverflow.com/questions/15710853/objective-c-check-if-subviews-of-rotated-uiviews-intersect CGPoint poly2 count int count2 for int i 0 i count1 i Perpendicular vector for one edge of poly1 CGPoint p1 poly1 i CGPoint p2 poly1 i 1 count1 CGPoint perp CGPointMake p2.y p1.y p2.x p1.x Projection intervals of poly1 poly2 onto.. vector for one edge of poly1 CGPoint p1 poly1 i CGPoint p2 poly1 i 1 count1 CGPoint perp CGPointMake p2.y p1.y p2.x p1.x Projection intervals of poly1 poly2 onto perpendicular vector CGFloat minp1 maxp1 minp2 maxp2 self projectionOfPolygon.. vector for one edge of poly1 CGPoint p1 poly1 i CGPoint p2 poly1 i 1 count1 CGPoint perp CGPointMake p2.y p1.y p2.x p1.x Projection intervals of poly1 poly2 onto perpendicular vector CGFloat minp1 maxp1 minp2 maxp2 self projectionOfPolygon..
OpenGL ES (iPhone) Touch Picking http://stackoverflow.com/questions/2231433/opengl-es-iphone-touch-picking 0 a 0 vector 1 a 1 vector 2 a 2 vector 3 w 0 vector 4 w 1 vector 5 10.0f 3 non colinear points on the plane GLfloat p1 rect.origin.x rect.origin.y 0 GLfloat p2 rect.origin.x rect.size.width rect.origin.y 0 GLfloat p3 rect.origin.x rect.size.width.. p3 rect.origin.x rect.size.width rect.origin.y rect.size.height 0 location plane normal vector Ax By Cz D 0 GLfloat lp p1 1 p2 2 p3 2 p2 1 p3 2 p1 2 p3 1 p1 2 p2 2 p1 2 p2 0 p3 0 p2 2 p3 0 p1 0 p3 2 p1 0 p2 0 p1 0 p2 1 p3 1 p2 0 p3 1 p1 1 p3.. rect.origin.y rect.size.height 0 location plane normal vector Ax By Cz D 0 GLfloat lp p1 1 p2 2 p3 2 p2 1 p3 2 p1 2 p3 1 p1 2 p2 2 p1 2 p2 0 p3 0 p2 2 p3 0 p1 0 p3 2 p1 0 p2 0 p1 0 p2 1 p3 1 p2 0 p3 1 p1 1 p3 0 p1 1 p2 1 p1 0 p2 1 p3..
iPhone image stretching (skew) http://stackoverflow.com/questions/2351586/iphone-image-stretching-skew image stretching skew How do I skew an image For example each corner has a CGPoint with coords p1 p2 p3 p4. Then I need to set p4.x 50 p4.y 30. So this corner p4 should be stretched in a 2D perspective and the image should.. your transform does not. For your transform it can be done in two steps. One to convert the square into a trapezoid. p1 p2 p1 p2 p3 p4 p3 p4' Another to the vertical direction. A naive transformation rule is y c x' x p1.x ”——————†p1.x.. transform does not. For your transform it can be done in two steps. One to convert the square into a trapezoid. p1 p2 p1 p2 p3 p4 p3 p4' Another to the vertical direction. A naive transformation rule is y c x' x p1.x ”——————†p1.x p1.y..
Find the tangent of a point on a cubic bezier curve (on an iPhone) http://stackoverflow.com/questions/4089443/find-the-tangent-of-a-point-on-a-cubic-bezier-curve-on-an-iphone using those coefficients return C1 t t t C2 t t C3 t C4 @implementation MBBezierView void drawRect CGRect rect CGPoint p1 p2 p3 p4 p1 CGPointMake 30 rect.size.height 0.33 p2 CGPointMake CGRectGetMidX rect CGRectGetMinY rect p3 CGPointMake CGRectGetMidX.. coefficients return C1 t t t C2 t t C3 t C4 @implementation MBBezierView void drawRect CGRect rect CGPoint p1 p2 p3 p4 p1 CGPointMake 30 rect.size.height 0.33 p2 CGPointMake CGRectGetMidX rect CGRectGetMinY rect p3 CGPointMake CGRectGetMidX rect.. fill UIColor redColor setStroke UIBezierPath bezierPath UIBezierPath alloc init autorelease bezierPath moveToPoint p1 bezierPath addCurveToPoint p4 controlPoint1 p2 controlPoint2 p3 bezierPath stroke UIColor brownColor setStroke now mark..
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 product to get the angle between vector 1 and 2. Compute the distance in lat lon space via equirectangular projection p1 lonp lon1 cos 0.5 latp lat1 convert lat lon to radians p2 latp lat1 distance R sqrt p1 p1 p2 p2 use R 6371000 and your distance.. via equirectangular projection p1 lonp lon1 cos 0.5 latp lat1 convert lat lon to radians p2 latp lat1 distance R sqrt p1 p1 p2 p2 use R 6371000 and your distance will be in meters Now scale this distance to your map scale At this point you have.. equirectangular projection p1 lonp lon1 cos 0.5 latp lat1 convert lat lon to radians p2 latp lat1 distance R sqrt p1 p1 p2 p2 use R 6371000 and your distance will be in meters Now scale this distance to your map scale At this point you have..
Drawing Smooth Curves - Methods Needed http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed smoothedPath moveToPoint POINT 0 for NSUInteger index 1 index points.count 2 index CGPoint p0 POINT index 1 CGPoint p1 POINT index CGPoint p2 POINT index 1 CGPoint p3 POINT index 2 now add n points starting at p1 dx dy up until p2 using Catmull.. p0 POINT index 1 CGPoint p1 POINT index CGPoint p2 POINT index 1 CGPoint p3 POINT index 2 now add n points starting at p1 dx dy up until p2 using Catmull Rom splines for int i 1 i granularity i float t float i 1.0f float granularity float tt.. i float t float i 1.0f float granularity float tt t t float ttt tt t CGPoint pi intermediate point pi.x 0.5 2 p1.x p2.x p0.x t 2 p0.x 5 p1.x 4 p2.x p3.x tt 3 p1.x p0.x 3 p2.x p3.x ttt pi.y 0.5 2 p1.y p2.y p0.y t 2 p0.y 5 p1.y 4 p2.y..
Iframe Content Not Rendering Under Scroll In iOs5 iPad/iPhone http://stackoverflow.com/questions/8912218/iframe-content-not-rendering-under-scroll-in-ios5-ipad-iphone scrolling touch iframe id myIframe src http http css tricks.com forums discussion 11946 scrolling iframe on ipad p1 iframe div The problem is that the off screen iframe content is not becoming visible when scrolling to it the frame is blank..
How can I add CGPoint objects to an NSArray the easy way? http://stackoverflow.com/questions/899600/how-can-i-add-cgpoint-objects-to-an-nsarray-the-easy-way a method that will just return the corresponding CGPoint for an given index. I don't want to create 50 variables like p1 ... p2 ... and so on. Is there an easy way that would let me to define those points instantly when initializing the NSArray..
how can i trace the finger movement on touch for drawing smooth curves? http://stackoverflow.com/questions/1052119/how-can-i-trace-the-finger-movement-on-touch-for-drawing-smooth-curves a Catmull Rom spline into a series of cubic Bezier curves. Here's how. Say you have four consecutive sample points P0 P1 P2 and P3 the cubic Bezier curve that connects P1 to P2 is defined by the following control points B0 P1 B1 P1 P2 P0 6 B3.. curves. Here's how. Say you have four consecutive sample points P0 P1 P2 and P3 the cubic Bezier curve that connects P1 to P2 is defined by the following control points B0 P1 B1 P1 P2 P0 6 B3 P2 P1 P3 6 B4 P2 This should work well as long as.. points P0 P1 P2 and P3 the cubic Bezier curve that connects P1 to P2 is defined by the following control points B0 P1 B1 P1 P2 P0 6 B3 P2 P1 P3 6 B4 P2 This should work well as long as your sample points aren't too dense and it's super easy...
Find the tangent of a point on a cubic bezier curve (on an iPhone) http://stackoverflow.com/questions/4089443/find-the-tangent-of-a-point-on-a-cubic-bezier-curve-on-an-iphone The tangent of a curve is simply its derivative. The parametric equation that Michal uses P t 1 t ^3 P0 3t 1 t ^2 P1 3t^2 1 t P2 t^3 P3 should have a derivative of dP t dt 3 1 t ^2 P0 3 1 t ^2 P1 6t 1 t P1 3t^2 P2 6t 1 t P2 3t^2 P3 Which.. Michal uses P t 1 t ^3 P0 3t 1 t ^2 P1 3t^2 1 t P2 t^3 P3 should have a derivative of dP t dt 3 1 t ^2 P0 3 1 t ^2 P1 6t 1 t P1 3t^2 P2 6t 1 t P2 3t^2 P3 Which by the way appears to be wrong in your earlier question. I believe you're using.. uses P t 1 t ^3 P0 3t 1 t ^2 P1 3t^2 1 t P2 t^3 P3 should have a derivative of dP t dt 3 1 t ^2 P0 3 1 t ^2 P1 6t 1 t P1 3t^2 P2 6t 1 t P2 3t^2 P3 Which by the way appears to be wrong in your earlier question. I believe you're using the slope..
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