vector-graphics | 易学教程

How do I find hash value of a 3D vector?

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问题 I am trying to perform broad-phase collision detection with a fixed-grid size approach. Thus, for each entity's position: (x,y,z) (each of type float), I need to find which cell does the entity lie in. I then intend to store all the cells in a hash-table and then iterate through to report (if any) collisions. So, here is what I am doing: Grid-cell's position: (int type) (Gx, Gy, Gz) => (x / M, y / M, z / M) where M is the size of the grid. Once, I have a cell, I'd like to add it to a hash

Loop an animation with Snap.svg

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问题 Background : I'm using Snap.svg to render a circle, then animate its radius on hover. I've got that piece working with the code below. Problem : I'm trying to get a looping "pulse" effect once circleRadar is hovered on, which would involve continuously animating between the initial r and the new r of 70. While the docs' mention of snap.animate(from, to,...) here seems promising, I can't figure out how I would implement that in the context of my code. Is there anyone a little more familiar

Recommendations for converting raster images to vector graphics

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If a person is looking to batch convert a large number of raster images into vector graphics, are there any tools out there that do that well? For an example, think of just about any diagram that has standard shapes (ellipses, rectangles) and text. Inkscape uses the Potrace engine to trace raster graphics. You usually have to play with it a bit to get useful output, but it does surprisingly well and is easy to use. Maybe the desktop edition (not free) of Vector Magic could help you out. Link: http://vectormagic.com/ I'll enthusiastically second the nomination of Vector Magic. I recently did

How to show a subsection or “slice” of an SVG graphic?

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Is there any way to slice an SVG . I mean any already available lib . I need to implement this slicing component in Java. I mean , I have single SVG file and based rulers/scales i choose graphically , I want to slice the single SVG into different SVG files. Hope I am clear Yes, although, you'd think this was classified information - or just simply impossible - based on how hard it is to find this basic fact.... Apparently , all you need to do is reference the viewBox from a URI "fragment". . I have confirmed, it does indeed work. Take the following example... The lesson of the story, in case

Is there a way to parse a vector path geometry in UWP in code behind?

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问题 When rendering vector graphics across different platforms, SVG and the SVG path format works really great. But at the moment its my challenge to realize this on the Universal Windows Platform. I've a given path (taken from SVG file) for example: M 198.09375 723.80859 C 177.18295 774.80866 156.88493 827.84014 140.58594 884.89844 L 140.72461 885.21875 L 142.49609 885.21875 C 161.1353 855.01082 143.6824 808.69757 193.58008 822.50977 C 220.7388 819.58475 192.23555 868.86205 206.17383 873.92578 C

Is there an efficient way to store 2D plots as a vector graphic in python?

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I'm currently trying to store python plots as vector graphics to improve their appearance in a latex document. For 1D plots this works quite fine: import numpy as np import matplotlib as mpl mpl.use('svg') new_rc_params = { "font.family": 'Times', "font.size": 12, "font.serif": [], "svg.fonttype": 'none'} #to store text as text, not as path mpl.rcParams.update(new_rc_params) import matplotlib.pyplot as plt x = np.linspace(-.5, .5, 1024) plt.figure() plt.plot(x, x) plt.title('\$x = y\$') plt.xlabel('\$x\$ [m]') plt.ylabel('\$y\$ [m]') plt.savefig('test.svg', format = 'svg', bbox_inches = 'tight

Boolean operations on a SVG pathstring

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问题 I've come to a conceptually difficult problem. In short, I need to find the vector path of two vector paths combined through different boolean operations. Such as the Union, the Difference, the Intersection, and Subtraction. It would be nice if I could do it similar to how Canvas does it's globalCompositeOperation. How in the world would I go about doing this? 回答1: There is a JavaScript library that allows for boolean operations on SVG paths under the condition that the path is a polygon.

Point Sequence Interpolation

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问题 Given an arbitrary sequence of points in space, how would you produce a smooth continuous interpolation between them? 2D and 3D solutions are welcome. Solutions that produce a list of points at arbitrary granularity and solutions that produce control points for bezier curves are also appreciated. Also, it would be cool to see an iterative solution that could approximate early sections of the curve as it received the points, so you could draw with it. 回答1: The Catmull-Rom spline is guaranteed

Produce PDF files, draw polygons with rounded corners

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What's the right tool for the job if I want to write a Python script that produces vector graphics in PDF format ? In particular, I need to draw filled polygons with rounded corners (i.e., plane figures that are composed of straight lines and circular arcs ). It seems that matplotlib makes it fairly easy to draw rectangles with rounded corners and general polygons with sharp corners. However, to draw polygons with rounded corners, it seems that I have to first compute a Bézier curve that approximates the shape. Is there anything more straightforward available? Or is there another library that

XAML Icons - How to use?

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问题 I have some vector graphic files in XAML format and I would like to use them as icons/buttons in an Silverlight application. The approach I would have preferred is to use an Image control and set its source property to the .xaml file, much like I can use a regular bitmap image. But its not that easy and I have tried to include them as ControlTemplates in resource dictionary's and I even tried to create a custom control that would load the Xaml dynamically but I wasn't really pleased with the