vector-graphics

问题 I recently start teaching myself game programming. Someone recommend me to start with Python and I got the book "Beginning game development with Python and Pygame: From novice to professional". I got to a part where they teach about Vectors and creating a Vector2 class. Everything was going well until I tried to overload the division operator. My code goes like this: class Vector2(object): def __init__(self, x=0.0, y=0.0): self.x = x self.y = y def __str__(self): return "(%s, %s)"%(self.x,

问题 I am trying to draw zoomable graphics onto the screen. I currently have a UIView inside of a ScrollView and I'm wondering what the best way is to go about handling/implementing zooming of the graphics I've drawn on the screen. 回答1: You'll probably want to use something along the lines of what I describe in my answer here. During the pinch-zooming event, a transform will be applied to your UIView, which will zoom the content but will lead to blurring. Once the zooming event is finished, use

问题 X problem: I want to use vector graphic in WPF. I have bunch of SVG files, which I can convert into XAML by using Inkscape. Resulting xaml is ResourceDictionary with ViewBox / Canvas containing Path , etc. Dictionaries are merged into App.xaml and I can use key to access them. Question: how to use such images ? It looks like I am not using them properly. Here is how I am using them <Viewbox Child="{StaticResource MyImageResourceKey}" Width="100" Height="100"/> But it looks like I can use it

问题 I'm working on a Vector2D class, and I think both vector addition and scalar addition make sense to be implemented with the +=/+ operators. Trouble is, I don't really know how to work around this apparent argument ambiguity, here's what Clang says: vector2d_test.cpp:17:16: error: use of overloaded operator '+=' is ambiguous (with operand types 'Vector2D<float>' and 'int') vector += 1; ~~~~~~ ^ ~~~~~~~ vector2d.hpp:34:18: note: candidate function Vector2D<T>& operator+=(const Vector2D<T>&

问题 All, I have the following resources which defines a custom CheckBox and the images to use for the checked/un-checked states. <sys:String x:Key="Up"> F1 M 37.8516,35.625L 34.6849,38.7917L 23.6016,50.2708L 23.6016,39.9792L 37.8516,24.9375L 52.1016,39.9792L 52.1016, 50.2708L 41.0182,38.7917L 37.8516,35.625 Z </sys:String> <sys:String x:Key="Down"> F1 M 37.8516,39.5833L 52.1016,24.9375L 52.1016,35.2292L 37.8516,50.2708L 23.6016,35.2292L 23.6016,24.9375L 37.8516,39.5833 Z </sys:String> <Style x

问题 Here is my function: void Object::draw2() { if(!mIsInitialised) { return; } //Tell OpenGL about our vertex and normal data glEnableClientState(GL_VERTEX_ARRAY); glVertexPointer(3, GL_FLOAT, 0, &Vertices.front()); glEnableClientState(GL_NORMAL_ARRAY); glNormalPointer(GL_FLOAT, 0, &Temp2.front()); //draw the .txt-file glDrawElements(GL_TRIANGLES, Indices.size(), GL_UNSIGNED_INT, &Indices.front()); //restore the state GL back glDisableClientState(GL_VERTEX_ARRAY); glDisableClientState(GL_NORMAL

问题 How can I use clip-path with Raphaël.js like this example. It seams that Raphael.js has only clip-rect in it. 回答1: You can cut a hole through a path drawn shape. This is a technique known as donut holes and you can see an example on my index page If this looks difficult it is not See the information database and the technique labelled donut holes My site index is http://www.irunmywebsite.com/ Err it used to be. Now you can find a multiple clip path (Imagine seeing a view through several holes

问题 I'm trying to change this pie chart, so that when I click on a segment, the color of the different segments don't change. I see that the fill has a direct relationship with the shape of the segment, but I totally suck. Please help! You can see the pie chart in action here: http://raphaeljs.com/growing-pie.html function drawgrowingpie () { var r = Raphael("holder"); r.customAttributes.segment = function (x, y, r, a1, a2) { var flag = (a2 - a1) > 180, clr = (a2 - a1) / 360; a1 = (a1 % 360) *

问题 I am creating a WPF application that will display 2D vector graphics of a city-scale water management system. I have captured data from hundreds pages of schematic drawings of valves, pumps, treatment facilities, etc and the piping that interconnects them. Combine this with mapping information of individual residences and commercial properties and the data set has about 100,000 node instances along with the interconnecting pipe information. I have a proof-of-concept application that creates a

问题 I'm working on a project that uses tile engine (self made), and my next task is to create an AI (besides other AIs that are done), this one is tricky because the AI should only spot the player if the player is in the AI's sight. Tried it with for cycles to after calculating the ranges (in tiles) [1 tile = 32*32]. Then I thought about creating an equation of a straight line. And here I am, puzzled in math. Any idea how could I calculate if it's overlaps one of these "hidden" tiles? NOTE that I