The CanvasRenderingContext2D.fillStyle
property of the Canvas 2D API specifies the color, gradient, or pattern to use inside shapes. The default style is #000
(black).
This example applies a blue fill color to a rectangle.
HTML
<canvas id="canvas"></canvas>
JavaScript
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
ctx.fillStyle = 'blue';
ctx.fillRect(10, 10, 100, 100);
Result
In this example, we use two for
loops to draw a grid of rectangles, each having a different fill color. To achieve this, we use the two variables i
and j
to generate a unique RGB color for each square, and only modify the red and green values. (The blue channel has a fixed value.) By modifying the channels, you can generate all kinds of palettes.
const canvas = document.getElementById('canvas');
const ctx = canvas.getContext('2d');
for (let i = 0; i < 6; i++) {
for (let j = 0; j < 6; j++) {
ctx.fillStyle = `rgb(
${Math.floor(255 - 42.5 * i)},
${Math.floor(255 - 42.5 * j)},
0)`;
ctx.fillRect(j * 25, i * 25, 25, 25);
}
}
The result looks like this:
In WebKit- and Blink-based browsers, the non-standard and deprecated method ctx.setFillColor()
is implemented in addition to this property.
setFillColor(color, optional alpha);
setFillColor(grayLevel, optional alpha);
setFillColor(r, g, b, a);
setFillColor(c, m, y, k, a);