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JavaScript - fill canvas with two different colors horizontally
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In this article, we would like to show you how to fill a canvas with two different colors horizontally using JavaScript.
Quick solution:
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var canvas = document.querySelector('#my-canvas');2
var context = canvas.getContext('2d');3
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context.fillStyle = 'yellow';5
context.fillRect(0, 0, canvas.width, canvas.height / 2);6
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context.fillStyle = 'red';8
context.fillRect(0, canvas.height / 2, canvas.width, canvas.height / 2);
In this example, we present how to use fillRect() method to fill the canvas with two different colors.
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<html>3
<head>4
<style>5
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#my-canvas { border: 1px solid gray; }7
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</style>9
</head>10
<body>11
<canvas id="my-canvas" width="200" height="200"></canvas>12
<script>13
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var canvas = document.querySelector('#my-canvas');15
var context = canvas.getContext('2d');16
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context.fillStyle = 'yellow';18
context.fillRect(0, 0, canvas.width, canvas.height / 2);19
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context.fillStyle = 'red';21
context.fillRect(0, canvas.height / 2, canvas.width, canvas.height / 2);22
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</script>24
</body>25
</html>
In this section, we present a reusable function that fills the canvas with two specified colors.
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<html>3
<head>4
<style>5
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#my-canvas { border: 1px solid gray; }7
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</style>9
</head>10
<body>11
<canvas id="my-canvas" width="200" height="200"></canvas>12
<script>13
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function fillCanvas(context, color1, color2) {15
var middleY = canvas.height / 2;16
context.fillStyle = color1;17
context.fillRect(0, 0, canvas.width, middleY);18
context.fillStyle = color2;19
context.fillRect(0, middleY, canvas.width, middleY);20
}21
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// Usage example:24
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var canvas = document.querySelector('#my-canvas');26
var context = canvas.getContext('2d');27
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fillCanvas(context, 'yellow', 'red');29
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</script>31
</body>32
</html>
