What you need is the De Casteljau algorithm. This will allow you to split your curve into whatever segments you’d like. However, since you’re dealing with just cubic curves, I’d like to suggest a slightly easier to use formulation that’ll give you a segment from t0 to t1 where 0 <= t0 <= t1 <= … Read more
Taken from the same Wikipedia article where you got the image: Translating to values which range from 0 to 255: rOut = (rA * aA / 255) + (rB * aB * (255 – aA) / (255*255)) gOut = (gA * aA / 255) + (gB * aB * (255 – aA) / (255*255)) bOut … Read more
The following code is based on a quaternion (qw, qx, qy, qz), where the order is based on the Boost quaternions: boost::math::quaternion<float> quaternion; float qw = quaternion.R_component_1(); float qx = quaternion.R_component_2(); float qy = quaternion.R_component_3(); float qz = quaternion.R_component_4(); First you have to normalize the quaternion: const float n = 1.0f/sqrt(qx*qx+qy*qy+qz*qz+qw*qw); qx *= n; qy … Read more
Convert all of the colors to the CIE Lab color space and compute the distance in that space deltaE = sqrt(deltaL^2 + deltaA^2 + deltaB^2) Colors with the lowest deltaE are the most perceptually similar to each other.
To give you some more choices of libraries out there: Polyboolean. I never tried this one, but it looks promising: http://www.complex-a5.ru/polyboolean/index.html General Polygon Clipper. This one works very well in practice and does triangulation as well as clipping and holes holes: http://www.cs.man.ac.uk/~toby/alan/software/ My personal recommendation: Use the tesselation from the GLU (OpenGL Utility Library). The … Read more
There are some problem to fix here: → fadeTimer.Interval = 10;: You’re (possibly) using the wrong Timer: the System.Timers.Timer‘s Elapsed is raised in a ThreadPool Thread. Unless you have set the SynchronizingObject to a Control object, which is then used to marshal the handler calls, referencing a Control in the handler will cause trouble (cross-thread … Read more
As of 3.2 you there is direct support for shadows in the SDK. label.layer.shadowColor = [label.textColor CGColor]; label.layer.shadowOffset = CGSizeMake(0.0, 0.0); Play with the parameters: label.layer.shadowRadius = 3.0; label.layer.shadowOpacity = 0.5; And to avoid shadow being clipped by the label bouds: label.layer.masksToBounds = NO; Don’t forget to #include <Quartzcore/Quartzcore.h> and link against the QuartzCore or … Read more
Your Point position measure is off because of the integer rounding generated by the RotatePoint() method. A simple correction in the method returned value, using float coordinates, will produce the correct measure: To test it, create a Timer and register its Tick event as RotateTimerTick(): Added a rotation spin increment (see the rotationSpin Field) to … Read more
Your currently selected backend, ‘agg’ does not support show(). AGG backend is for writing to file, not for rendering in a window. See the backend FAQ at the matplotlib web site. ImportError: No module named _backend_gdk For the second error, maybe your matplotlib distribution is not compiled with GTK support, or you miss the PyGTK … Read more