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Draw a line automaticlly tied to circle on Konva JS

i want to draw a line beetween a circle everytime i add a circle on konva js. and the circle is dragable. so i want the line follow the circle when i drag it. How to do it? or maybe i'm doing it wrong. Here my code https://jsfiddle.net/nutsi/2L7v6hy3/13/
var stage = new Konva.Stage({
height: window.innerHeight * 0.85,
width: window.innerWidth * 0.85,
container: "konva"
});
var layer = new Konva.Layer();
stage.on("click", function(){
var points = [];
var pos = this.getRelativePointerPosition();
var dot = new Konva.Circle({
x: pos.x,
y: pos.y,
fill: 'red',
radius: 5,
id: "seljal",
draggable: true
});
layer.add(dot)
var a = layer.find("#seljal")
for(let x = 0; x < a.length; x++){
points.push(a[x].attrs.x, a[x].attrs.y)
}
var line = new Konva.Line({
points: points,
stroke: "red",
strokeWidth: 2,
dash: [5, 5],
opacity: 1,
closed: !0,
id: "line"
})
var b = layer.find("#line")[0]
if(b) b.destroy();
layer.add(line);
})
stage.add(layer);
stage.draw();

Place node centred on rotated note

I have following example stage.
const rectangle = new Konva.Rect({
width: 300,
height: 100,
x: stage.width() / 2,
y: stage.height() / 2,
fill: 'blue',
rotation: 140
});
layer.add(rectangle);
layer.draw();
const tooltip = new Konva.Label({
x: rectangle.x() + (rectangle.width() / 2),
y: rectangle.y() + (rectangle.height() / 2),
opacity: 0.75
});
tooltip.add(
new Konva.Tag({
fill: 'green',
pointerDirection: 'down',
pointerWidth: 6,
pointerHeight: 4,
lineJoin: 'round'
})
);
tooltip.add(new Konva.Text({
text: 'Hello world',
fontSize: 12,
padding: 5,
fill: 'white',
}));
layer.add(tooltip);
layer.draw();
When the rectangle has no rotation I am able to place the tooltip correctly in the centre of the node. When the rectangle has some rotation the tooltip is not centred any more.
Without changing the attributes of the rectangle or rotating the tooltip, how can I place the tooltip in the centre of the rectangle node?
JSBIN example:
https://jsbin.com/wopoxuligi/edit?html,js,output

First, you need to update your declaration for Konva in the html script tag as you are referencing an old version.
<script src="https://unpkg.com/konva#7.0.3/konva.min.js"></script>
Because this shape is a rect you can call rectangle.getClientRect() to get the position on the stage, then use simple center-math to place your label. Slip this code in at the end of your current code where you do the last layer.draw();
const cliRect = rectangle.getClientRect();
let pos = {
x: cliRect.x + (cliRect.width )/2,
y: cliRect.y + (cliRect.height )/2
};
tooltip.x(pos.x)
tooltip.y(pos.y)
layer.draw();
This will leave the pointer of the label pointing at the centre of the rotated rectangle, with the label being non-rotated. Working snippet below - run it full screen.
const stage = new Konva.Stage({
container: 'container',
width: window.innerWidth,
height: window.innerHeight,
draggable: true
});
const layer = new Konva.Layer();
stage.add(layer);
const rectangle = new Konva.Rect({
width: 300,
height: 100,
x: stage.width() / 2,
y: stage.height() / 2,
fill: 'blue',
rotation: 140
});
layer.add(rectangle);
layer.draw();
const tooltip = new Konva.Label({
x: rectangle.x() + (rectangle.width() / 2),
y: rectangle.y() + (rectangle.height() / 2),
opacity: 0.75
});
tooltip.add(
new Konva.Tag({
fill: 'green',
pointerDirection: 'down',
pointerWidth: 6,
pointerHeight: 4,
lineJoin: 'round'
})
);
tooltip.add(new Konva.Text({
text: 'Hello world',
fontSize: 12,
padding: 5,
fill: 'white',
}));
layer.add(tooltip);
const cliRect = rectangle.getClientRect();
// Extra red rect to illustrate client rect. Not needed in solution
const rectangle1 = new Konva.Rect({
width: cliRect.width,
height: cliRect.height,
x: cliRect.x,
y: cliRect.y,
stroke: 'red'
});
layer.add(rectangle1);
let pos = {
x: cliRect.x + (cliRect.width )/2,
y: cliRect.y + (cliRect.height )/2
};
// Set tooltip position taking account of stage draggind
tooltip.x(pos.x - stage.x())
tooltip.y(pos.y - stage.y())
console.log(pos)
layer.draw();
<script src="https://unpkg.com/konva#7.0.3/konva.min.js"></script>
<div id="container"></div>
EDIT: In a comment the OP pointed out that the real use case requires the stage to be draggable before the label is added and that after the drag the calc of the label position fails. This is because getClientRect() gives the position in the client container without adjustment for the stage movement. To make the code work with a dragged stage, change the two lines that set tooltip.x & y to adjust by the stage.x & y, as follows:
tooltip.x(pos.x - stage.x())
tooltip.y(pos.y - stage.y())

I added offset to rectangle, to rotate it by its center point and managed to have the tooltip centered.
const stage = new Konva.Stage({
container: 'container',
width: window.innerWidth,
height: window.innerHeight
});
const layer = new Konva.Layer();
stage.add(layer);
var group1 = new Konva.Group({
draggable: true
});
const rectWidth = 300;
const rectHeight = 100;
const rectangle = new Konva.Rect({
width: rectWidth,
height: rectHeight,
x: stage.width() / 2,
y: stage.height() / 2,
fill: 'blue',
rotation: 140,
offset: {
x: rectWidth / 2,
y: rectHeight / 2,
},
});
const tooltip = new Konva.Label({
x: rectangle.x() + (rectangle.width() / 2),
y: rectangle.y() + (rectangle.height() / 2),
offset: {
x: rectangle.width() / 2,
y: rectangle.height() / 2,
},
opacity: 0.75
});
tooltip.add(
new Konva.Tag({
fill: 'green',
pointerDirection: 'down',
pointerWidth: 6,
pointerHeight: 4,
lineJoin: 'round'
})
);
tooltip.add(new Konva.Text({
text: 'Hello world',
fontSize: 12,
padding: 5,
fill: 'white',
}));
layer.add(rectangle);
layer.add(tooltip);
layer.draw();
<script src="https://unpkg.com/konva#^2/konva.min.js"></script>
<div id="container"></div>

Konva group X&Y different than shape X&Y

I am trying to edit another example that was posted on here but something doesn't seem right. I have a shape and then a couple of shapes that are grouped together with an arrow that is pointing in between the two shapes. As one of the shapes is dragged the arrow position should move as well.
The Problem
The problem is that the shape seems to be on a different coordinate system where its 0,0 point is in the upper left corner, whereas the groups coordinate system where its 0,0 point is right in the middle of the screen. What am I doing wrong?
Code
<!DOCTYPE html>
<html>
<head>
<script src="https://cdn.rawgit.com/konvajs/konva/0.13.0/konva.min.js"></script>
<meta charset="utf-8">
<title>Konva Circle 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 group = new Konva.Group({
x:120,
y:120,
draggable: true,
});
var circle = new Konva.Circle({
x: stage.getWidth() / 2,
y: stage.getHeight() / 2,
radius: 40,
fill: 'green',
stroke: 'black',
strokeWidth: 2,
});
var circleA = new Konva.Circle({
x: stage.getWidth() / 5,
y: stage.getHeight() / 5,
radius: 30,
fill: 'red',
stroke: 'black',
strokeWidth: 2,
draggable: true
});
var arrow = new Konva.Arrow({
points: [circle.getX(), circle.getY(), circleA.getX(), circleA.getY()],
pointerLength: 10,
pointerWidth: 10,
fill: 'black',
stroke: 'black',
strokeWidth: 4
});
var star = new Konva.Star({
x: stage.getWidth() / 2,
y: stage.getHeight() / 2,
numPoints: 5,
innerRadius: 30,
outerRadius: 50,
fill: '#89b717',
opacity: 0.8,
scale: {
x : 1.4,
y : 1.4
},
rotation: Math.random() * 180,
shadowColor: 'black',
shadowBlur: 10,
shadowOffset: {
x : 5,
y : 5
},
shadowOpacity: 0.6,
});
//layer.add(star);
var stage = new Konva.Stage({
container: 'container',
width: width,
height: height
});
function adjustPoint(e){
var p=[circle.getX(), circle.getY(), circleA.getX(), circleA.getY()];
arrow.setPoints(p);
layer.draw();
console.log(group.getX(),group.getY());
console.log(circleA.getX(),circleA.getY());
}
//circle.on('dragmove', adjustPoint);
group.on('dragmove', adjustPoint);
circleA.on('dragmove', adjustPoint);
group.add(star,circle);
//group.add(circle);
layer.add(group);
layer.add(circleA);
// add the shape to the layer
//layer.add(circle);
layer.add(arrow);
//layer.add(star);
// add the layer to the stage
stage.add(layer);
</script>
</body>
</html>

When you put a shape on a group, it's getX() and getY() functions return values relative to the origin point of the group. Your error was to assume that the X, Y position of the circle in the group would change as the group is dragged.
In the working code below, based on your posted code, I changed only the first line of the AdjustPoint() function so that the X, Y position of the circle has added to it the X, Y position of the group.
This fixes your issue.
Tip: as you start using groups be aware that their extent on the page is that of the minimum rectangle needed to contain the group shapes. If you want to specifically control the size and location of a group, add to it a Rect() shape of specific width and height to give a known size to the group.
I also added a call to that function at the end of the code so that the arrow joins when the code initially runs.
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 group = new Konva.Group({
x:120,
y:10,
draggable: true,
});
var circle = new Konva.Circle({
x: stage.getWidth() / 2,
y: 60,
radius: 40,
fill: 'green',
stroke: 'black',
strokeWidth: 2,
});
var circleA = new Konva.Circle({
x: stage.getWidth() / 5,
y: stage.getHeight() / 5,
radius: 30,
fill: 'red',
stroke: 'black',
strokeWidth: 2,
draggable: true
});
var arrow = new Konva.Arrow({
points: [circle.getX(), circle.getY(), circleA.getX(), circleA.getY()],
pointerLength: 10,
pointerWidth: 10,
fill: 'black',
stroke: 'black',
strokeWidth: 4
});
var star = new Konva.Star({
x: stage.getWidth() / 2,
y: 60,
numPoints: 5,
innerRadius: 30,
outerRadius: 50,
fill: '#89b717',
opacity: 0.8,
scale: {
x : 1.4,
y : 1.4
},
rotation: Math.random() * 180,
shadowColor: 'black',
shadowBlur: 10,
shadowOffset: {
x : 5,
y : 5
},
shadowOpacity: 0.6,
});
var stage = new Konva.Stage({
container: 'container',
width: width,
height: height
});
function adjustPoint(e){
// changes here
var p=[ group.getX() + circle.getX(), group.getY() + circle.getY(), circleA.getX(), circleA.getY()];
// changes here
arrow.setPoints(p);
layer.draw();
stage.draw();
// console.log('group = ' + group.getX() + ', ' + group.getY());
// console.log('red circle = ' + circleA.getX() + ', ' + circleA.getY());
}
//circle.on('dragmove', adjustPoint);
group.on('dragmove', adjustPoint);
circleA.on('dragmove', adjustPoint);
group.add(star,circle);
//group.add(circle);
layer.add(group);
layer.add(circleA);
// add the shape to the layer
//layer.add(circle);
layer.add(arrow);
//layer.add(star);
// add the layer to the stage
stage.add(layer);
// changes here
adjustPoint();
body {
margin: 0;
padding: 0;
overflow: hidden;
background-color: #F0F0F0;
}
<script src="https://cdn.rawgit.com/konvajs/konva/0.13.0/konva.min.js"></script>
<body>
<div id="container"></div>
</body>

KineticJS: Setting Shadow on shape causing error in tween

I am creating pie chart using multiple Kinetic.Wedges and a tween that moves the pieces out.
This works fine, but when I attempt to add
shadowColor: 'black',
shadowBlur: 2,
shadowOffset: 10,
shadowOpacity: 0.5
in the wedge instantiation it bugs out - the error "TypeError: b is undefined" comes up. If I comment out the tween instantiation the shape loads without error (with shadows) so I suspect something in tween instantiation is causing it.
Here is code for this purpose.
var stage = new Kinetic.Stage({
container: 'container',
width: 578,
height: 200});
var splits = [{perc: 30, colour: "red"},
{perc: 15, colour: "blue"},
{perc: 20, colour: "green"},
{perc: 35, colour: "yellow"}];
var layer = new Kinetic.Layer();
var startPos = 0;
for (var i = 0; i < splits.length; i++){
(function(){
var wedge = new Kinetic.Wedge({
x: stage.getWidth() / 3,
y: stage.getHeight() / 2,
radius: 70,
angleDeg: toAngleDeg(splits[i].perc),
fill: splits[i].colour,
stroke: 'black',
strokeWidth: 1,
rotationDeg: startPos});
layer.add(wedge);
wedge.tween = new Kinetic.Tween({
node: wedge,
rotationDeg: 90 + (180 - (toAngleDeg(splits[i].perc)/2)),
x: stage.getWidth() / 1.5,
easing: Kinetic.Easings.EaseInOut});
startPos += toAngleDeg(splits[i].perc);
wedge.on('mouseup', function(){
wedge.setZIndex(100);
wedge.tween.play();}
);
})()}
stage.add(layer);
What am i doing wrong here?

Issue with Mouseover event in KineticJS

I am trying to do a bit of experimentation with KinetiJs Canvas library. What I have done below is - Draw a Rectangle, and whenever there is a mouseover I want a line to be drawn between specific points.
The problem is, I do not see any line when a mouseover happens.
I have tried checking if the onmousemove function gets called or not and it does get called, but the line doesn't get drawn. Can anyone please explain why?
$(document).ready(function () {
var stage = new Kinetic.Stage({
container: "sketchcanvas",
width: 600,
height: 600
});
var layer = new Kinetic.Layer();
var rect = new Kinetic.Rect({
x: 50,
y: 50,
width: 500,
height: 500,
fill: "#00D2FF",
stroke: "black",
strokeWidth: 4
});
rect.on("mousemove", function () {
var mousePos = stage.getMousePosition();
var x = mousePos.x;
var y = mousePos.y;
var line = new Kinetic.Line({
points: [60, 60, 80, 80, 100, 200],
stroke: "black",
strokeWidth: 15,
lineCap: 'round',
lineJoin: 'round'
});
layer.add(line);
});
layer.add(rect);
stage.add(layer);
});

In KineticJS, after you make alterations or additions to a layer, you need to draw() to the layer for effects to show
...
layer.add(line);
layer.draw();