I want to be able to draw a fitted rectangle around text labels (person's full name). The margin isn't terribly important, but I can't just draw fixed-sized rectangles because the labels vary in lengths. How do I do this?
Here's the code that draws the text labels:
var ctx = document.getElementById('map').getContext('2d');
for (i=0; i < num_people; i++) {
var pos = get_position(i, num_people);
ctx.fillText(names[i], pos.x, pos.y);
}
您可以使用measureText()获得绘制文本的大小。
Useful links for canvas text:
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