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2014/10/15 ¤U¤È 10:12:27
iphone Programming Glossary: p3OpenGL ES (iPhone) Touch Picking http://stackoverflow.com/questions/2231433/opengl-es-iphone-touch-picking 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 rect.origin.y rect.size.height 0 location plane normal vector Ax By Cz D 0 GLfloat lp p1 1.. 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 0 p1 1 p2.. 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..
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 be.. 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 c y'.. 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 c y' y where..
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 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.. rect CGPoint p1 p2 p3 p4 p1 CGPointMake 30 rect.size.height 0.33 p2 CGPointMake CGRectGetMidX rect CGRectGetMinY rect p3 CGPointMake CGRectGetMidX rect CGRectGetMaxY rect p4 CGPointMake 30 CGRectGetMaxX rect rect.size.height 0.66 UIColor blackColor.. alloc init autorelease bezierPath moveToPoint p1 bezierPath addCurveToPoint p4 controlPoint1 p2 controlPoint2 p3 bezierPath stroke UIColor brownColor setStroke now mark in points along the bezier for CGFloat t 0.0 t 1.00001 t 0.05 UIColor..
Drawing Smooth Curves - Methods Needed http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed 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 Rom splines for int i 1 i granularity i 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 p3.y tt 3 p1.y p0.y 3 p2.y p3.y ttt smoothedPath.. 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 p3.y tt 3 p1.y p0.y 3 p2.y p3.y ttt smoothedPath addLineToPoint..
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