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line.html
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line.html
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<!DOCTYPE html>
<html>
<head>
<script src="https://unpkg.com/konva@4.2.2/konva.min.js"></script>
<meta charset="utf-8" />
<title>Konva Simple Line Demo</title>
<style>
body {
margin: 0;
padding: 0;
overflow: hidden;
background-color: #f0f0f0;
}
</style>
</head>
<body>
<div id="container"></div>
<script>
var width = window.innerWidth;
var height = window.innerHeight;
var stage = new Konva.Stage({
container: 'container',
width: width,
height: height,
});
var layer = new Konva.Layer();
var dragPoints = [
{
id:'target_0',
x: 300,
y: 500
},
{
id:'target_1',
x: 375,
y: 500
},
];
var redLineGroup = new Konva.Group({
draggable: true
})
var redLine = new Konva.Line({
points: [300, 500,
375,500],
stroke: 'red',
strokeWidth: 4,
lineCap: 'round',
lineJoin: 'round',
name: 'basic',
zindex:'0'
});
redLineGroup.add(redLine);
layer.add(redLineGroup);
for (const dragPoint of dragPoints) {
CreatedragPoints(dragPoint.id,dragPoint.x,dragPoint.y)
}
// add the layer to the stage
stage.add(layer);
layer.draw();
function CreatedragPoints(id, x, y, radius=2, fill='red' ) {
const circle = new Konva.Circle({
id: id,
x:x,
y:y,
fill: fill,
radius: radius,
draggable: true,
zindex:'1',
});
redLineGroup.add(circle);
layer.batchDraw();
circle.on("dragmove", e => {
console.log('circle move')
for (const dragPoint of dragPoints) {
if (dragPoint.id === circle.id()) {
dragPoint.x = Math.round(circle.x());
dragPoint.y = Math.round(circle.y());
}
}
updateObjects(e);
});
circle.on("dragend", e => {
//updateObjects();
recoverStyle(e);
});
circle.on("dblclick", e => {
//updateObjects();
console.log('circle dblclick')
circle.destroy();
layer.batchDraw();
clearPoint(e,circle.id());
});
}
redLineGroup.on("dragmove", e => {
console.log('redLineGroup move start')
console.log('redLineGroup move end')
});
redLine.on("dragmove", e => {
console.log('redLine move start')
console.log('redLine move end')
});
redLineGroup.on('click', function(e) {
updateStye(e);
});
redLineGroup.on('dblclick', function(e) {
creatNewPoint(e);
});
function clearPoint(e,id) {
dragPoints.forEach((dragPoint,index)=>{
if(dragPoint.id === id) {
dragPoints.splice(index, 1);
}
})
updateObjects(e);
}
function creatNewPoint(e){
if (dragPoints.length === 2) {
let point = {}
if (dragPoints[0].x === dragPoints[1].x){
point = {
id:'target_' + dragPoints.length,
x: dragPoints[0].x,
y: dragPoints[0].y + Math.abs((dragPoints[1].y-dragPoints[0].y)/2)
}
} else if (dragPoints[0].y === dragPoints[1].y){
point = {
id:'target_' + dragPoints.length,
x: dragPoints[0].x + Math.abs((dragPoints[1].x-dragPoints[0].x)/2),
y: dragPoints[0].y
}
} else {
point = {
id:'target_' + dragPoints.length,
x: (dragPoints[1].x >dragPoints[0].x) ? (dragPoints[0].x + Math.abs((dragPoints[1].x-dragPoints[0].x)/2)) : (dragPoints[1].x + Math.abs((dragPoints[1].x-dragPoints[0].x)/2)),
y: (dragPoints[1].y >dragPoints[0].y) ? (dragPoints[0].y + Math.abs((dragPoints[1].y-dragPoints[0].y)/2)) : (dragPoints[1].y + Math.abs((dragPoints[1].y-dragPoints[0].y)/2)),
}
}
dragPoints.splice(1, 0, point);
CreatedragPoints(point.id,point.x,point.y,6,'yellow')
} else {
var evt = e.evt;
let x=evt.clientX;
let y=evt.clientY;
let fromIndex;
dragPoints.forEach((dragPoint,index)=>{
if(index !== dragPoints.length - 1) {
if (((dragPoint.x <= x && dragPoints[index+1].x >= x ) && (dragPoint.y <= y && dragPoints[index+1].y >= y )) ||
((dragPoint.x <= x && dragPoints[index+1].x >= x ) && (dragPoint.y >= y && dragPoints[index+1].y <= y )) ||
((dragPoint.x >= x && dragPoints[index+1].x <= x ) && (dragPoint.y <= y && dragPoints[index+1].y >= y )) ||
((dragPoint.x >= x && dragPoints[index+1].x <= x ) && (dragPoint.y >= y && dragPoints[index+1].y <= y ))
){
fromIndex = index
}
}
})
point = {
id:'target_' + dragPoints.length,
x: (dragPoints[fromIndex+1].x > dragPoints[fromIndex].x) ? (dragPoints[fromIndex].x + Math.abs((dragPoints[fromIndex+1].x-dragPoints[fromIndex].x)/2)) : (dragPoints[fromIndex+1].x + Math.abs((dragPoints[fromIndex+1].x-dragPoints[fromIndex].x)/2)),
y: (dragPoints[fromIndex+1].y > dragPoints[fromIndex].y) ? (dragPoints[fromIndex].y + Math.abs((dragPoints[fromIndex+1].y-dragPoints[fromIndex].y)/2)) : (dragPoints[fromIndex+1].y + Math.abs((dragPoints[fromIndex+1].y-dragPoints[fromIndex].y)/2)),
}
dragPoints.splice(fromIndex+1, 0, point);
CreatedragPoints(point.id,point.x,point.y,6,'yellow')
}
console.log(dragPoints);
}
function updateObjects(e){
let points = [];
for (const dragPoint of dragPoints) {
points.push(dragPoint.x);
points.push(dragPoint.y);
}
console.log(points)
redLine.points(points);
layer.batchDraw();
}
function updateStye(e){
redLine.stroke('green');
redLine.dash([10, 5]);
for (const dragPoint of dragPoints) {
var target = layer.findOne("#" + dragPoint.id);
target.fill('yellow');
target.radius(6);
}
layer.batchDraw();
}
function recoverStyle(e) {
redLine.stroke('red');
redLine.dash([0, 0]);
for (const dragPoint of dragPoints) {
var target = layer.findOne("#" + dragPoint.id);
target.fill('red');
target.radius(2);
}
layer.batchDraw();
}
</script>
</body>
</html>