How to fill a shape on mouseover using canvas?
How to fill a shape on mouseover using canvas?
1 answer
by
rollin ,
a year ago
@cortez.connelly
To fill a shape on mouseover using the canvas element in HTML5, you can use JavaScript to listen for the 'mouseover' event on the canvas element and then redraw the shape with a different color or fill style.
Here is an example code snippet to demonstrate how to fill a rectangle on mouseover using canvas:
HTML:
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<canvas id="myCanvas" width="200" height="200"></canvas> |
JavaScript:
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// Get the canvas element
const canvas = document.getElementById('myCanvas');
const ctx = canvas.getContext('2d');
// Initial rectangle properties
let rectX = 50;
let rectY = 50;
let rectWidth = 100;
let rectHeight = 50;
// Function to draw the rectangle
function drawRect() {
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.fillStyle = 'blue';
ctx.fillRect(rectX, rectY, rectWidth, rectHeight);
}
// Event listener for mouseover
canvas.addEventListener('mouseover', function(event) {
ctx.fillStyle = 'red';
ctx.fillRect(rectX, rectY, rectWidth, rectHeight);
});
// Event listener for mouseout
canvas.addEventListener('mouseout', function(event) {
ctx.fillStyle = 'blue';
ctx.fillRect(rectX, rectY, rectWidth, rectHeight);
});
// Initial draw of the rectangle
drawRect();
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In this example, when the mouse is over the canvas, the rectangle will be filled with a red color. When the mouse is not over the canvas, the rectangle will be filled with a blue color. The drawRect() function is called to initially draw the blue rectangle on the canvas.