How do you draw an arrow at the end of a bezier curve in SVG / raphael?
I have a curve generated by this:
var path = ["M", x1.toFixed(3), y1.toFixed(3), "L", arrow_left_x, arrow_left_y, "L", arrow_right_x, arrow_right_y, "L", x1.toFixed(3), y1.toFixed(3), "C", x2, y2, x3, y3, x4.toFixed(3), y4.toFixed(3)].join(",");
but my arrow is not correctly done.
- it only points to the right, and doesn't point the same direction as the slope of the curve at the end of the bezier. - it is not fillednow, I know I'm not doing the math correctly here, but mainly, I just want to know how to fill the triangle at the end of the line. thanks!
For demo purposes:
arrow_left_x = (x1 - 8);
arrow_left_y = (y1 - 8);
arrow_right_x = (x1 - 8);
arrow_ri开发者_运维百科ght_y = (y1 + 8);
that is the code for getting the the coordinates I use.
I guess you should use markers for your purpose. See an example here.
Edit:
You need to create a marker in the defs
section:
var defs = document.createElementNS('http://www.w3.org/2000/svg', 'defs');
var marker = document.createElementNS('http://www.w3.org/2000/svg', 'marker');
marker.setAttribute('id', 'Triangle');
marker.setAttribute('viewBox', '0 0 16 16');
marker.setAttribute('refX', '0');
marker.setAttribute('refY', '6');
marker.setAttribute('markerUnits', 'strokeWidth');
marker.setAttribute('markerWidth', '16');
marker.setAttribute('markerHeight', '12');
marker.setAttribute('orient', 'auto');
var path = document.createElementNS('http://www.w3.org/2000/svg', 'path');
marker.appendChild(path);
path.setAttribute('d', 'M 0 0 L 16 8 L 0 16 z');
path.setAttribute('stroke', '#000');
path.setAttribute('stroke-width', '1');
path.setAttribute('style', ' marker-start :none; marker-end :none; ');
document.getElementById( id_of_svg_placeholder ).getElementsByTagName('svg')[0].appendChild(defs);
defs.appendChild(marker);
and referense it in CSS:
path {marker-start:url("#Triangle")}
or as an attribute:
<path d="..." marker-start="url(#Triangle)" />
Here's the resulting jsfiddle
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