vector-graphics

问题 Is it possible to get float t back given the resulting value and the four points? If so, how? public static Vector3 GetPoint (Vector3 p0, Vector3 p1, Vector3 p2, Vector3 p3, float t) { t = Mathf.Clamp01(t); float oneMinusT = 1f - t; return oneMinusT * oneMinusT * oneMinusT * p0 + 3f * oneMinusT * oneMinusT * t * p1 + 3f * oneMinusT * t * t * p2 + t * t * t * p3; } Code from this Tutorial by Jasper Flick 回答1: It is, and involves implementing root finding for third degree functions. One direct

问题 We have a matrix of given integers (any from 1 to INT_MAX) like 1 2 3 1 3 3 1 3 3 100 2 1 We want to create polygons with same colors for each unique int in matrix so our polygons would have coords/groupings like shown here. and we could generate image like this: Which *(because of vectirisation that was performed would scale to such size like): (sorry for crappy drawings) Is it possible and how to do such thing with boost geometry? Update: So @sehe sad: I'd simply let Boost Geometry do most

问题 This area is hardly documented online and it would be great to see a working Swift 3 example, of say, a custom drawn cube with manual SCNvector3s. There is this in objective-C but not Swift. This might not be a usual form of question but I know it would help many. If there is somewhere I missed, please mention. The documentation is not very helpful scngeometrysource, etc. Thanks 回答1: A custom geometry is constructed from a set of vertices and normals. Vertices In this context, a vertex is a

问题 I am working on a simple drawing application, and i need an algorithm to make flood fills. The user workflow will look like this (similar to Flash CS, just more simpler): the user draws straight lines on the workspace. These are treated as vectors, and can be selected and moved after they are drawn. user selects the fill tool, and clicks on the drawing area. If the area is surrounded by lines in every direction a fill is applied to the area. if the lines are moved after the fill is applied,

问题 I would like to figure out how to save a bitmap or vector graphics image after creating a drawing with python's turtle module. After a bit of googling I can't find an easy answer. I did find a module called canvas2svg, but I'm very new to python and I don't know how to install the module. Is there some built in way to save images of the turtle canvas? If not where do I put custom modules for python on an Ubuntu machine? 回答1: from Tkinter import * from turtle import * import turtle forward(100

问题 I am creating a painting application in Actionscript (although my question is not Actionscript related). The basic idea is to start painting when the mouse is pressed and tracking the mouse movements. What I want to achieve is: reduce mouse "noise" and create more smoother looking lines. Right now, ( 1 ) is problematic because I get thousands of mouse movements within a few seconds. Due to ( 1 ) the line can look jaggy. What current idea: when the user finishes drawing the line, I store all

问题 I haven't found anything in LibGDX that would work with vector graphics. This post suggests that AGG is close as it gets, they also mentioned that it is a lot of pain. Is there a painless alternative ? 回答1: There does not seem to be any painless support for vector graphics in Libgdx at this point (mid-2013). First, for vector graphics generally that means SVG in practice. Part of the problem with a "generic" SVG solution is that getting it to work with all the various corner cases seems to be

问题 This question already has answers here : svg: generate 'outline path' (3 answers) Closed 2 years ago . I want to convert a stroked path to a filled object. (Programmatically, in JavaScript.) The line is just a simple curved line, a sequence of coordinates. I can render this line as a path, and give it a stroke of a certain thickness... but I'm trying to get a filled shape rather than a stroked line, so that I can do further modifications on it, such as warping it, so the resulting 'stroke'

问题 I need to draw concentric arcs of various sizes using raphael.js. I tried to understand the code behind http://raphaeljs.com/polar-clock.html, which is very similar to what I want, but, whithout comments, it is quite difficult to fathom. Ideally, I would need a function that creates a path that is at a given distance from some center point, starts at some angle and ends at some other angle. 回答1: That answer is ok, but cant be animated. I ripped the important stuff out of polar-clock for you.

问题 If you're like me, your eye will be twitching by the end of reading this. I don't blame you. Our client has requested us to develop a responsive HTML email template, with two specifications: Using as few images as possible Using as many "fancy css-enabled features" as possible. Mostly, this just means rounded corners on boxes. This question is specifically about executing the rounded corners. Gmail and Apple support CSS rounded corners, and Outlook requires vector graphics. For the remaining