Suppose that I have an existing SVG scene. I would now like to paint a rectangle on top of this scene, and for all background pixels that are covered by this rectangle, I would like to apply some filter, e.g. desaturation. Note that I can do darkening/lightening using opacity, but in this case, I'd like a more complicated effect. Is this possible to do?
Sure, use an feColorMatrix filter type="saturate" See here
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I have a SVG-image map with many polygons, which are directly bordering and all have a white stroke. On hovering, that stroke should turn darkgrey and become wider. Easy CSS.
But my problem: As objects in SVG are rendered after one another, the wider stroke will not overlap the other object, but underlap it, which looks super ugly. Is there a way to make it overlap instead?
Thanks in advance,
snow
Is there a possibility to make a part of svg rect transparent? f.x. it has width 100px, and between 40 and 70 px it is transparent. Problem is - the central part should be really transparent and show elements below, it should be not filled with background color like mask.
Thank you in advance.
Use a clipPath to define which parts of your SVG should be transparent.
Complete example here.
I'm trying to use d3's brush control. All works good except the rect.background of the brush is not expanding to fill the whole SVG, thus not allowing me to use the brush on the most right and bottom areas of SVG (which are not covered with background).
This jsFiddle illustrates the problem (scroll to the right and try using brush there) I've outlined the .background rect with the border.
What is the reason of this? And how to make the brush control to work all over the SVG?
I am trying to mimic the behavior of markers on white boards and was wondering if it I can do it with svg polylines. I know the stroke width can be set but can be it changed to vary depending on the velocity of the mouse which I can figure out or is it just a constant value for the stroke?
Or if you wanted to use SVG, instead of using a <polyline>, use a series of connected <line>s
You can't have multiple stroke widths in a single polyline element. I think canvas is probably a better fit for this task.
I'm working with SVG using the Raphael library. I can apply a fill colour to an object like so:
circle.attr({fill: "#ff0000"});
And this also works (though the Raphael documentation doesn't mention it):
circle.attr({fill: "url(pattern.png)"});
I am able to use transparent PNGs as fill patterns, and transparency works as expected. The svg object is completely transparent where the fill pattern image is transparent. But what I would like to do is specify both a fill pattern image and a fill colour, so that the colour would show through where the pattern image is transparent - similar to the 'background' property using CSS, for example. Is this possible with SVG?
You can define a pattern that has a rect with a fill, and an image that is your png on top of that rect. Then use the pattern as fill for the circle (or whatever element you want).
This means stepping outside of Raphaël, or extending it to do what you want. Note that what ({fill: "url(pattern.png)"}) does is to create a pattern element and and append an image element pointing to the given url. It's quite possible to hack Raphaël to allow you to pass a color too, and then you deal with that in the code that creates the pattern by creating a rect of the same dimensions as the image with the given fill color.
I should say that if you want it to work with IE<9 then you probably need to implement it in VML too.
Other options include drawing two shapes, one with color fill and the other with the raster image fill. Yet another is to make the png include the background color so that it's not transparent.