In addition to the id of arrow, there are six attributes on this marker, that you can use on all markers. Here’s the code for the first line and arrowhead (the one pointing right) again. Now let’s take a look at the attributes on the marker element. Without a single change the element, the arrowhead adjusted itself to the line. The ability to adjust with what they’re being attached to is what makes markers special. I didn’t have to alter anything about the marker itself for it to appear properly at the end of the line. The x and y values of the line are the only changes I made. This second line starts at (295,50) and ends at (95,75). Let’s leave the marker alone and change the line so point in the opposite direction and also at a slight angle from horizontal. It’s a black (#000) horizontal line 5px wide, and it’s drawn from the point (50,50) to the point (250,50).Īt the end of the line element is an attribute named marker-end which references the marker with an id of arrow. Ignore the attributes on the marker element (besides the arrow id) for a moment and look at the line element. If you remember your line path commands, this one begins at a point (0,0) then draws a line to the point (0,6) or 6px down, then a line to the point (9,3), before the z command closes the path and draws a line back to (0,0). Inside the marker is a path that creates a small red triangle. Also notice it’s been given an id of arrow. Notice that it’s contained inside so it won’t display until referenced. This SVG contains a marker and a line that references the marker. The easiest way to understand markers is with a simple example. A marker is always placed inside a element and you refer to it elsewhere to use it. You create a marker using the element and its associated attributes. The most common use is to draw arrowheads or graphical shapes that mark points (polymarkers) on a the resulting line(s). The ElementĪ marker is a type of symbol that gets attached to one or more vertices of a path, line, polyline, or polygon. I want to talk about markers, which are typically used to create arrowheads and other polymarkers.
Today I want to talk about a specific type of element that will always be defined in one place and referenced in another. The last couple of weeks I talked about how to organize your SVG code and how you could define graphical objects for later reuse. Better would be to make things easy on yourself and use a element. You could reuse a graphic you defined in or elements, but then you have to move and rotate your arrowhead with each new line. You could create a new one for each line, but that duplicates code. A common graphic element drawn with SVG are arrowheads.
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