How to flip a Circle vertically using FabricJS?
In this tutorial, we are going to learn how we can flip a Circle object vertically using FabricJS. Circle is one of the various shapes provided by FabricJS. In order to create a circle, we will have to create an instance of fabric.Circle class and add it to the canvas. We can flip a circle object vertically using the flipY property.
语法
new fabric.Circle({ flipY: Boolean }: Object)
Parameters
options (optional) − This parameter is an Object which provides additional customizations to our circle. Using this parameter, properties such as colour, cursor, stroke width and a lot of other properties can be changed related to the object of which flipY is a property.
Options Keys
flipY − This property accepts a Boolean value. It allows us to flip an object vertically.
Example 1
Passing flipY as key with a 'false' value
Let's see an example that shows us the default orientation of a circle object in FabricJS. Since we are passing the flipY property a false value, the circle object will not be flipped vertically.
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
<h2>How to flip a Circle vertically using FabricJS?</h2>
<p>This is the default orientation of the object. We have set <b>flipY</b> as False, but even if we don't use it, <b>flipY</b> will be by default set to False. </p>
<canvas id="canvas"></canvas>
<script>
// 启动一个canvas实例
var canvas = new fabric.Canvas("canvas");
var circle = new fabric.Circle({
left: 215,
top: 50,
fill: "green",
radius: 80,
stroke: "#228b22",
strokeWidth: 2,
flipY: false
});
// 创建渐变填充
circle.set("fill", new fabric.Gradient({
type: "linear",
coords: {
x1: 0,
y1: 0,
x2: 0,
y2: 50
},
colorStops: [{
offset: 0,
color: "red"
}, {
offset: 1,
color: "green"
}, ],
}));
// 将它们添加到画布
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
示例 2
Passing the flipY property as key with a 'true' value
In this example, we have a circle object of radius 80px with a vertical linear gradient fill. As we apply the flipY property to the circle object, it flips vertically and thus we see that the gradient has flipped as well.
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
<h2>How to flip a Circle vertically using FabricJS?</h2>
<p>Here observe that the circle has flipped vertically (see the gradient), as we have set <b>flipY</b> to True.</p>
<canvas id="canvas"></canvas>
<script>
// 启动一个canvas实例
var canvas = new fabric.Canvas("canvas");
var circle = new fabric.Circle({
left: 215,
top: 50,
fill: "green",
radius: 80,
stroke: "#228b22",
strokeWidth: 2,
flipY: true
});
// 创建渐变填充
circle.set("fill", new fabric.Gradient({
type: "linear",
coords: {
x1: 0,
y1: 0,
x2: 0,
y2: 50
},
colorStops: [{
offset: 0,
color: "red"
}, {
offset: 1,
color: "green"
}, ],
}));
// 将它们添加到画布
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
