问题
Good morning, I find myself working with the Konvajs library, https://github.com/konvajs/vue-konva
There is the following documentation: https://konvajs.org/docs/sandbox/Connected_Objects.html, but I can't implement it with vuejs
Since what I need to do is that when selecting object 1, I can drag and form the arrow and when selecting object 2, they are linked
Currently I have built the following:
<template>
<v-container>
<v-stage :config="configKonva">
<v-layer>
<v-circle :config="configCircle"></v-circle>
</v-layer>
<v-layer>
<v-circle :config="configCircleA"></v-circle>
</v-layer>
</v-stage>
</v-container>
</template>
<script>
export default {
data(){
return {
configKonva: {
width: 200,
height: 200
},
configCircle: {
x: 100,
y: 100,
radius: 70,
fill: "red",
stroke: "black",
strokeWidth: 4,
draggable: true
},
configCircleA: {
x: 100,
y: 100,
radius: 70,
fill: "green",
stroke: "black",
strokeWidth: 4,
draggable: true
}
}
},
}
</script>
Visually I have only created the circles, I lack the connection of these 2 through a line
回答1:
There are many ways to implement such functionality. Basically, you just need to listen to mousedown
, mousemove
and mouseup
events to understand when to draw lines. You can also add touchstart
, touchmove
and touchend
events to support mobile devices:
<template>
<div>
<v-stage
ref="stage"
:config="stageSize"
@mousedown="handleMouseDown"
@mouseup="handleMouseUp"
@mousemove="handleMouseMove"
>
<v-layer>
<v-line
v-for="line in connections"
:key="line.id"
:config="{
stroke: 'black',
points: line.points
}"
/>
<v-circle
v-for="target in targets"
:key="target.id"
:config="{
x: target.x,
y: target.y,
radius: 40,
stroke: 'black',
fill: 'green'
}"
/>
<v-text :config="{ text: 'Try to drag-to-connect objects'}"/>
</v-layer>
<v-layer ref="dragLayer"></v-layer>
</v-stage>
</div>
</template>
<script>
import Konva from "konva";
const width = window.innerWidth;
const height = window.innerHeight;
let vm = {};
function generateTargets() {
const circles = [];
for (var i = 0; i < 10; i++) {
circles.push({
x: width * Math.random(),
y: height * Math.random(),
id: i
});
}
return circles;
}
export default {
data() {
return {
stageSize: {
width: width,
height: height
},
targets: generateTargets(),
connections: [],
drawningLine: false
};
},
methods: {
handleMouseDown(e) {
const onCircle = e.target instanceof Konva.Circle;
if (!onCircle) {
return;
}
this.drawningLine = true;
this.connections.push({
id: Date.now(),
points: [e.target.x(), e.target.y()]
});
},
handleMouseMove(e) {
if (!this.drawningLine) {
return;
}
const pos = e.target.getStage().getPointerPosition();
const lastLine = this.connections[this.connections.length - 1];
lastLine.points = [lastLine.points[0], lastLine.points[1], pos.x, pos.y];
},
handleMouseUp(e) {
const onCircle = e.target instanceof Konva.Circle;
if (!onCircle) {
return;
}
this.drawningLine = false;
const lastLine = this.connections[this.connections.length - 1];
lastLine.points = [
lastLine.points[0],
lastLine.points[1],
e.target.x(),
e.target.y()
];
}
}
};
</script>
DEmo: https://codesandbox.io/s/vue-konva-connection-objects-qk2ps
来源:https://stackoverflow.com/questions/57498329/how-to-connect-2-objects-using-a-line-using-konvajs-in-vuejs