Canvas Clock Face
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Canvas Clock Face
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Part II - Draw a Clock Face
The clock needs a clock face. Create a JavaScript function to draw a clock face:
JavaScript:
function drawClock() {
drawFace(ctx, radius);
}
function drawFace(ctx, radius) {
var grad;
ctx.beginPath();
ctx.arc(0, 0, radius, 0, 2*Math.PI);
ctx.fillStyle = 'white';
ctx.fill();
grad = ctx.createRadialGradient(0,0,radius*0.95, 0,0,radius*1.05);
grad.addColorStop(0, '#333');
grad.addColorStop(0.5, 'white');
grad.addColorStop(1, '#333');
ctx.strokeStyle = grad;
ctx.lineWidth = radius*0.1;
ctx.stroke();
ctx.beginPath();
ctx.arc(0, 0, radius*0.1, 0, 2*Math.PI);
ctx.fillStyle = '#333';
ctx.fill();
}
Try it Yourself »
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var radius = canvas.height/2;
ctx.translate(radius, radius);
radius = radius*0.90
drawClock(ctx, radius);
function drawClock(ctx, radius) {
drawFace(ctx, radius);
}
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Code Explained
Create a drawFace() function for drawing the clock face:
function drawClock() {
drawFace(ctx, radius);
}
function drawFace(ctx, radius) {
}Draw the white circle:
ctx.beginPath();
ctx.arc(0, 0, radius, 0, 2*Math.PI);
ctx.fillStyle = 'white';
ctx.fill();
Create a radial gradient (95% and 105% of original clock radius):
grad = ctx.createRadialGradient(0,0,radius*0.95, 0,0,radius*1.05);Create 3 color stops, corresponding with the inner, middle, and outer edge of
the arc:
grad.addColorStop(0, '#333');
grad.addColorStop(0.5, 'white');
grad.addColorStop(1, '#333');The color stops create a 3D effect.
Define the gradient as the stroke style of the drawing object:
ctx.strokeStyle = grad;Define the line width of the drawing object (10% of radius):
ctx.lineWidth = radius * 0.1;Draw the circle:
ctx.stroke();Draw the clock center:
ctx.beginPath();
ctx.arc(0, 0, radius*0.1, 0, 2*Math.PI);
ctx.fillStyle = '#333';
ctx.fill();
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