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Questions tagged [vector-graphics]

For questions about scalable 2D graphics based on vector operations, as opposed to raster graphics. For example, polygons, Bézier curves and ellipses.

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scan line conversion

I am going throug the topic scan line conversion where the scan line parallel to the x-axis is put through the intersection test with all the edges of the polygon. Would there be any large ...
sajis997's user avatar
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5 votes
1 answer
3k views

How to draw an orthogonal graph from its edges and vertices data?

I am writing a software and I need to represent an graph in a orthogonal manner from topological data (vector of edges,vertices and their connectivity data) Graphs consist of a set of vertices and a ...
Iman Nia's user avatar
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2 votes
0 answers
31 views

Algorithm to extract key points from line drawing

I have orthographic 3-view black and white line drawings like this: I would like to extract a set of 'key points' from this kind of drawing. By 'key point', I mean corners and a few points along ...
Rob McDonald's user avatar
2 votes
0 answers
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How do freehand vector drawing tools typically decide where to place the control points?

I'm devising an algorithm to take a freehand curve and make a bezier spline from it. I can do this already just fine, but it's a naive implementation that creates about as many bezier curves as there ...
johnbakers's user avatar
2 votes
0 answers
42 views

How to add HemisphereLight to a simple threejs scene?

I'm trying to add light and see its changes in a simple scene in threejs but no matter the intensity or the color I set for the light, I see no change in a scene. Actually, if I don't include the ...
Jonas's user avatar
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2 votes
0 answers
210 views

Plotting software used in old scientific papers

Does anyone know what software was used in many old scientific papers (please see attached example). I love the clean look of the graph and the typeface. Thanks. Graph example
Dan B's user avatar
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2 votes
0 answers
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Vectorizing half tone images

Vectorizing continuous tone images is often met with color palette reduction and visual artifacts. Half-tone images, on the hand, have constant patterns in their tones, which would intuitively lead to ...
Danyil Bee's user avatar
1 vote
0 answers
53 views

How to encode UTF inside an Encapsulated PostScript

Twenty years ago I made a descriptive illustration program whose output was the industrial standard Encapsulated PostScript, which is also compatible with the LaTeX system. In order to write accented ...
user2309000's user avatar
1 vote
0 answers
157 views

How to do a scanline fill with a self intersecting polygon?

I have a bezier curve and would like to draw it's stroke. To do that, I planned to approximate the stroke to a polygon and fill it with a scanline algorithm. While I feel confident about implementing ...
Julius's user avatar
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1 vote
0 answers
136 views

How to programmatically extract shape types like circle etc from SVG file path attributes

I have paths in SVG file with d attributes with values like M 48.75521890547264 45.77014427860697 Q 48.756218905472636 45.77114427860697 50.24875621890547 45....
Papasani Mohansrinivas's user avatar
1 vote
0 answers
316 views

How can I convert a shape made out of pixels to vertices

I'm trying to implement the solution to get the minimum dissection into rectangles of a rectilinear polygon. My shape is made out of pseudo-pixels (different width/height) but for the moment let's ...
JSmith's user avatar
  • 183
0 votes
1 answer
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Point a normal vector towards a point in 3D-Space

Given a normal vector in 3D-Space, how can I rotate the vector, such it points to a point in 3D-Space. I tried couple of ways doing this, which ended up looking completely wrong.
user19022's user avatar
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0 answers
84 views

How to programmatically extract all rectangle shapes from SVG file?

I have a SVG which contains rectangles with other shapes. How can I extract all rectangle details(co-ordinates, height and width)? Find below svg details where I kept only one rectangle for reference. ...
Srikant's user avatar
0 votes
0 answers
268 views

How to get world coordinates from a 4X4 camera matrix

I have Intel T265 camera which has a camera coordinates system like following diagram: The camera system has two cameras and the center of the two cameras is the position of the camera system. The ...
Nick X Tsui's user avatar
0 votes
0 answers
157 views

Changing Coordinate Frames with Affine Transformations

Stuck with this questions could I get some help. where uA and vA are two orthonormal vectors indicating the two axes, and oA is the origin. Suppose that all three frames of reference shown in ...
gmjasonx's user avatar
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60 views

Mathematics in Computer Graphics

Can you please recommend some topic for research work related to mathematics in CG? (Maybe something like "Affine transformations in CG")
FlyMeToTheMoon's user avatar
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235 views

Non linear transformation of vector graphic

I want to do a non-linear transformation of a svg in python. My specific problem is to transform a rectangular svg image into a frustum like image, for which i have a mathematical equation of the form ...
user11799's user avatar