我正在尝试在画布上绘制图像,但是由于某些原因,它无法正常工作。我尝试使用默认的canvas API,KonvaJS和FabricJS,但这些都不起作用。其他形状(如矩形,圆形等)正常工作...
我的项目是通过Vue Cli用电子生成器构建的电子应用程序。
具有默认canvas API的代码:
<template>
<div>
<canvas ref="cnv" width="500" height="500"></canvas>
</div>
</template>
<script>
export default {
name: 'Test',
mounted() {
let cnv = document.querySelector("canvas");
let ctx = cnv.getContext("2d");
let img = new Image()
img.src = "./img.png"
img.onload = () => ctx.drawImage(img, 10, 10);
}
}
</script>
使用KonvaJS的代码:
<template>
<div id="cnv"></div>
</template>
<script>
import Konva from 'konva'
export default {
name: 'Test',
mounted() {
let stage = new Konva.Stage({
container: 'cnv',
width: 500,
height: 500,
})
let layer = new Konva.Layer()
stage.add(layer)
// Doesn't work with "fromUrl" method too
let image = new Image()
image.src = 'img.png'
image.onload = () => {
let img = new Konva.Image({
x: 20,
y: 20,
width: 32,
height: 48,
image: image,
})
layer.add(img)
layer.draw()
}
}
}
</script>
FabricJS的代码:
<template>
<div>
<canvas ref="cnv" width="500" height="500"></canvas>
</div>
</template>
<script>
import { fabric } from 'fabric'
export default {
name: 'Test',
mounted() {
const ref = this.$refs.cnv
const canvas = new fabric.Canvas(ref)
fabric.Image.fromURL('img.png', function(img) {
img.set({
left: 20,
top: 20,
})
canvas.add(img)
})
}
}
</script>
[代码沙箱中的示例:draw-image-test
这是我做错了,还是这是个严重的问题?