I want an arc line that goes from thick to thin, kind of like figure 13 here:
Is this possible with SVG?
Not with just a stroke, no. You would have to use a fill, and offset the paths slightly to get the tapering effect.
I found a way to do it, just draw two lines with a little offset in beginning point. Just like this:
<svg viewBox="0 0 1000 400">
<path d="M 50,250 C 50,150 150,50 250,50" fill="none" stroke="green" stroke-width="11"></path>
<path d="M 60,250 C 60,150 150,50 250,50" fill="none" stroke="green" stroke-width="11"></path>
</svg>
In Inkscape, there are Triangle In and Triangle Out styles for drawing curves that look like that, and they just make a path, so I assume not.
Related
Prallel lines use two srokes
Initially I drew 2 parallel lines with 2 different strokes an no problem at all.
But when I use only one stroke, the problem is that when it is drawn in the opposite direction the curvature is changed (the red and the blue lines do not overlap).
Prallel lines use only one sroke
So how to draw two parallel lines using only a single stroke?
In order to reverse the second path you need to:
Move to or line to the last point.
Use the second control point as the first control point.
Use the first control point as the second control point.
End the curve where you had the move to command.
svg{border:solid; background:white;}
path{stroke:red;fill:none;}
.b{stroke:rgba(200,200,0,.25);stroke-width:10 }
<svg viewBox="0 0 350 400">
<g>
<path d="M100,350 C100,350 100,50 250,50" />
<path d="M120,350 C120,350 120,70 250,70" />
<path class="b"
d="M100,350 C100,350 100,50 250,50
M250,70 C120,70 120,350 120,350" />
</g>
</svg>
I have a number of SVG images being inserted into a PDF file using TCPDF. For example:
<path d="M0 100 L 80 100 L 40 27 L 0 100" stroke="black" fill="transparent" stroke-width="5" />
The problem is that TCPDF seems to turn any transparency to grey. How can I make it transparent? I cannot simply turn it to white as it is being placed on top of other data as well.
Many of the shapes are complex, utilizing bezier curves and stroke arrays so I need to use a path rather than lines, polygons, or polylines.
I think this might not be possible, but I have found a workaround. Rather than setting
fill="transparent"
I just use:
fill="none"
or
fill-opacity="0"
This seems to work fine. Both can be found on this page:
How to make an SVG element transparent (using SVGweb)
Let's consider the simple following image in its SVG representation (running the code snippet will display it):
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200" height="200" width="200">
<g>
<path d="m 90.200184,21.865233 13.886726,0 0,91.406257 q 0,8.4375 -4.306646,11.86524 -3.7793,2.72461 -13.35938,2.72461 -10.37109,0 -18.19336,-1.05469 l -2.46094,-13.53516 q 11.07422,2.02148 18.45704,2.02148 5.97656,0 5.97656,-5.97656 l 0,-87.451177 z"/>
</g>
</svg>
The SVG path is actually a collection of points all around the shape, while it could be a simple top-down slanted curve (the red line here). Unfortunately, I am provided these images, and cannot change them.
I am looking for a way to convert—or rather approximate—the SVG polygon to an SVG open curve., either directly or in several steps.
Any solution is welcome, but my preference goes to this order:
programmatically (so that I can script it);
using Inkscape or GIMP (or any other Linux program);
well, anything that would work.
Thanks,
Isn't it as simple as deleting the closing z from the path?
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200" height="200" width="200">
<g>
<path d="m 90.200184,21.865233 13.886726,0 0,91.406257 q 0,8.4375 -4.306646,11.86524 -3.7793,2.72461 -13.35938,2.72461 -10.37109,0 -18.19336,-1.05469 l -2.46094,-13.53516 q 11.07422,2.02148 18.45704,2.02148 5.97656,0 5.97656,-5.97656 l 0,-87.451177"/>
</g>
</svg>
Or are you looking for something more complicated than that?
Obviously, deleting the closing z is simple to script in your programming language of choice.
This class of algorithms is generally known as finding the "skeleton" or "medial axis". If you search on those terms you will find papers and other documents describing different potential approaches. Many/most usually involve starting with bitmaps though.
https://en.wikipedia.org/wiki/Topological_skeleton
I'm searching for the simplest definition in svg of a squared number '8', like in the figure below (black inside).
Ways that come to my mind are made of filling several polygons (minimal would be 1 black rectangle and 2 white squares). Is there a way to define it with a single command, specifying all the vertices?
Update: the purpose, BTW, is to create a font from svg files like this one.
You can overlap multiple paths in a single path element and using the fill-rule "evenodd" the intersecting areas will crop. like so:
<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100">
<path stroke-width="0" d="M20,20 h20 v35 h-20z M25,25 h10 v10 h-10z M25,40 h10 v10 h-10z" fill-rule="evenodd" />
</svg>
Here is a link that explains how it works.
I'm trying to create an interactive grid for a web game (HTML, JS, etc.), in which every cell should change it's fill on hover/click. I need both a regular square grid, and a triangular grid. I want it to be vector based so that it will scale nicely to fit different screen sizes. I thought the easiest way would be to create a pattern and fill it on a rectangle. This is the code I have so far:
<pattern id="baseTile" width="10" height="10" patternUnits="userSpaceOnUse">
<path id="tile" d="M 0,0 L 0,10 10,10 10,0 Z" fill="none" stroke="gray" stroke-width="1"/>
</pattern>
For the square, and this for the triangular grid:
<pattern id="baseTile" width="10" height="10" patternUnits="userSpaceOnUse">
<path d="M 5,0 L 10,2.5 10,7.5 5,10 0,7.5 0,2.5 Z" fill="none" stroke="gray" stroke-width=".1" />
<path d="M 5,0 L 5,10" fill="none" stroke="gray" stroke-width=".1" />
<path d="M 0,2.5 L 10,7.5" fill="none" stroke="gray" stroke-width=".1" />
<path d="M 0,7.5 L 10,2.5" fill="none" stroke="gray" stroke-width=".1" />
<path d="M 0,0 L 0,2.5 M 0,7.5 L 0,10" fill="none" stroke="gray" stroke-width=".1" />
<path d="M 10,0 L 10,2.5 M 10,7.5 L 10,10" fill="none" stroke="gray" stroke-width=".1" />
</pattern>
They produce the grids I need, but I don't know how to target each cell individually. I'm guessing since I've found no information on this, it's just not possible, and some other solution other than should be used. Any ideas?
Edit:
I want to be able to cycle through different fills on mouse click. For the square grid, I'm using the code I found here: http://bl.ocks.org/bunkat/2605010 but for the triangular lattice, I have absolutely no idea where to begin. That's why I thought of .
PS: I should probably add I have no programming experience, I'm trying to make a nonogram game to teach myself some Javascript.
Patterns are purely decorative. Targetting a single tile within a pattern would be like targetting a single colour within a gradient. Better not to think about them as distinct "tiles", and instead think of it as a sheet of repeating wallpaper.
So what to do? Well, you are going to need a distinct element for each piece that you want to be able to manipulate. But since they are mostly the same, you'll want to use <use> elements to repeat the graphics. You'll need to do a bit of math to figure out how to position the triangles just right, but no worse than what you had to do to figure out that pattern. It will of course be easiest to create the elements with a loop in your JS script, although you could hard code the original elements in a <defs> section.
Moreover, you don't specify what you want to do with the individual cells. If you are going to be changing their appearance, it might help to remember that you can set styles on the <use> element and these will be inherited by the re-used graphics. So if you don't set fill/stroke directly, you can change them by styling the <use>, instead of having a separate, differently coloured template to swap in.