36
There is no easy way. You will have to draw the link text onto the canvas and then check for mouseclicks. Here is a demo html page:
var canvas = document.getElementById("myCanvas");
var ctx;
var linkText = "https://stackoverflow.com";
var linkX = 5;
var linkY = 15;
var linkHeight = 10;
var linkWidth;
var inLink = false;
// draw the balls on the canvas
function draw() {
canvas = document.getElementById("myCanvas");
// check if supported
if (canvas.getContext) {
ctx = canvas.getContext("2d");
//clear canvas
ctx.clearRect(0, 0, canvas.width, canvas.height);
//draw the link
ctx.font = '10px sans-serif';
ctx.fillStyle = "#0000ff";
ctx.fillText(linkText, linkX, linkY);
linkWidth = ctx.measureText(linkText).width;
//add mouse listeners
canvas.addEventListener("mousemove", on_mousemove, false);
canvas.addEventListener("click", on_click, false);
}
}
//check if the mouse is over the link and change cursor style
function on_mousemove(ev) {
var x, y;
// Get the mouse position relative to the canvas element.
if (ev.layerX || ev.layerX == 0) { //for firefox
x = ev.layerX;
y = ev.layerY;
}
x -= canvas.offsetLeft;
y -= canvas.offsetTop;
//is the mouse over the link?
if (x >= linkX && x <= (linkX + linkWidth) && y <= linkY && y >= (linkY - linkHeight)) {
document.body.style.cursor = "pointer";
inLink = true;
} else {
document.body.style.cursor = "";
inLink = false;
}
}
//if the link has been clicked, go to link
function on_click(e) {
if (inLink) {
window.location = linkText;
}
}<html>
<body onload="draw()">
<center>
<canvas id="myCa