html5,canvas , Fill color for an arc drawed by canvas


Fill color for an arc drawed by canvas

Question:

Tag: html5,canvas

I am trying to fill color for an arc. But, I don't want to use ctx.lineWidth to do that.

I try to draw it here. Please teach me how to fill color for it.


Answer:

You need to define a continuous path to be able to fill it with a single color if you don't want to use line-width.

Using two arcs means you need to "reverse" one of them so their end-points connect correctly without crossing. You can do this by using the counter-close wise flag at the end set to true and swap start and end angles:

ctx.arc(W/2, H, H-40, 2*Math.PI, Math.PI, true);  // CCW, swapped angles
ctx.arc(W/2, H, H, Math.PI, 2*Math.PI);
ctx.fill();                                       // now it can be filled

Updated fiddle


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