Develop Reference

Adding transformer to dynamically generated shapes?

I have the button which add new group which have square, to layer when clicked very simple code I guess no need to post. But my question is that how can I add transformer to it when on clicked?, I have done it with this mouseleave and mouseenter functions.
group.on('mouseenter', () => {
transformer.borderEnabled(true);
transformer.resizeEnabled(true);
layer.draw();
});
group.on('mouseleave', () => {
transformer.borderEnabled(false);
transformer.resizeEnabled(false);
layer.draw();
});
It is in loop which creates new group named "group", It works fine but in circle when I hover it the transformer appears but then when I go to transformer's boxes to resize it consider as it is mouseleave but this is doing only in circle not in line text.
So can I have solution for active transformer on element which is clicked or for considering hover on transformer boxes as a hover on node? Thanks

The mouseleave() will always fire because the pointer must leave the group to use the transformer handles or spinner.
An alternative approach would be
click to enable the transformer,
leave the transformer in place even when the mouse moves away
wait for a click on some other shape to know you can hide the transformer.
That is the standard GUI approach I believe.
If you need to show hover focus then stick a transparent rectangle the size of the groups clientrect into the group and change its stroke from transparent to some colour in the mouseenter and back in the mouseleave. You will also maybe want to set the rect.listening to false so as it coes not interfere with mouse events on the shapes in the group, but then again it might help in dragging.
Demo below.
// Set up the canvas and shapes
let stage = new Konva.Stage({container: 'container1', width: 300, height: 200});
let layer = new Konva.Layer({draggable: false});
stage.add(layer);
// Add a transformer.
let transFormer1 = new Konva.Transformer();
layer.add(transFormer1);
// Create a sample group
let group1 = new Konva.Group();
layer.add(group1);
group1.add(new Konva.Circle({x: 20, y: 30, radius: 15, fill: 'magenta', stroke: 'black'}))
group1.add(new Konva.Circle({x: 60, y: 40, radius: 15, fill: 'magenta', stroke: 'black'}))
group1.add(new Konva.Rect({x: 90, y: 60, width: 25, height: 25, fill: 'magenta', stroke: 'black'}));
let pos = group1.getClientRect();
let boundRect1 = new Konva.Rect({name: 'boundRect', x: pos.x, y: pos.y, width: pos.width, height: pos.height, fill: 'transparent', stroke: 'transparent'});
group1.add(boundRect1);
// When mouse enters the group show a border
group1.on('mouseenter', function(){
let boundRect = this.find('.boundRect');
boundRect[0].stroke('red');
layer.draw();
})
// and remove border when mouse leaves
group1.on('mouseleave', function(){
let boundRect = this.find('.boundRect');
boundRect[0].stroke('transparent');
layer.draw();
})
// If the group is clicked, enable the transformer on that group.
group1.on('click', function(){
transFormer1.attachTo(this)
layer.batchDraw();
})
// For a more pleasing demo let us have 2 groups.
// Make a copy of group1, offset new group, and change fill on its child shapes except the bound rect
let group2 = group1.clone();
layer.add(group2)
group2.position({x: 120, y: 30});
for (let i = 0, shapes = group2.getChildren(); i < shapes.length; i = i + 1){
shapes[i].fill(shapes[i].fill() !== 'transparent' ? 'cyan' : 'transparent');
}
stage.draw();
<script src="https://unpkg.com/konva#^3/konva.min.js"></script>
<p>Move mouse over the shapes to see the group borders, click a group to apply the transformer.
</p>
<div id='container1' style="display: inline-block; width: 300px, height: 200px; background-color: silver; overflow: hidden; position: relative;"></div>

Got the answer!, I just create a public transformer and on stage click I am adding nodes to it no transformer to each group just one public transformer which hold one node at a time.

pixijs text is cutted

I'm trying to draw text in pixijs app stage and the text is cut off a bit. See the screenshot below.
I've tried to put it inside container but I can't fix it.
const style = new PIXI.TextStyle({
fontFamily: 'Bangers',
fontSize: 256,
fontWeight: 'bold',
fill: ['#ffa512', '#ff9e00'], // gradient
stroke: '#fff',
strokeThickness: 5,
dropShadow: true,
dropShadowColor: '#000000',
dropShadowBlur: 4,
dropShadowAngle: Math.PI / 6,
dropShadowDistance: 2,
});
const richText = new PIXI.Text('Nagitto', style);
richText.x = 50;
richText.y = 250;
app.stage.addChild(richText);
No exceptions.
I'm using a font from google fonts.

Use padding property inside style.
padding: 5,
I suggest you can use https://pixijs.io/pixi-text-style/# to dynamically create text with a preview.

The text is hardly cut from the code you wrote to create it. In my experience, this is only happening when there is a mask on the stage.
Please show the code for your container where you add the text in.

Openlayers 3: add text label to feature

I have the current set up here: fully functional fiddle example and whilst I have managed to zoom to each polygon feature I would also like to display a centralised text label on each... the field_title variable found within the get_fields method. I have no idea how to do this and all my googling has come up with this article: http://openlayers.org/en/v3.3.0/examples/vector-labels.html which I find totally confusing as I'm a little new to OL!

To add a text to ol.Feature you will store the description in the feature and set a style that is a style function (that will get the description from the feature and show it):
field_polygon.set('description', field_title);
field_polygon.setStyle(styleFunction);
function styleFunction() {
return [
new ol.style.Style({
fill: new ol.style.Fill({
color: 'rgba(255,255,255,0.4)'
}),
stroke: new ol.style.Stroke({
color: '#3399CC',
width: 1.25
}),
text: new ol.style.Text({
font: '12px Calibri,sans-serif',
fill: new ol.style.Fill({ color: '#000' }),
stroke: new ol.style.Stroke({
color: '#fff', width: 2
}),
// get the text from the feature - `this` is ol.Feature
// and show only under certain resolution
text: map.getView().getZoom() > 12 ? this.get('description') : ''
})
})
];
}
Your fiddle.

Since I am new here and are not allowed to comment, I put my comment as a new answer to the question of #andre_ss6. I also get Window on this. What works for me is passing in the feature object as the function's first parameter:
function styleFunction(feature) {
and then use that parameter instead of this:
text: feature.get('description')

Creating WordArt text effects -FabricJs

I am using fabricJs to create wordArts where one can scale, rotate, transform the texts.
The approach would be rotate and skew every character in text at a certain angle.
I am using Itext class of fabric to style each character
here is what I have done but it isn't working.
var canvas = new fabric.Canvas('c')
var text= "Test fabricJs"
var comicSansText = new fabric.IText(text, {
fontFamily: 'Comic Sans',
left: canvas.width/4, top: canvas.width/2 ,
stroke: '#ff1318',
strokeWidth: 1,
strokeStyle:"#fff",
styles:[[{"fill": "red",
"fontSize": 20,
"angle":30,
"transform":"rotate(30deg)"}]]
});
Refer fiddle here http://jsfiddle.net/swesh/c7s9x2fh/

To enable Curved text, you've to add fabric.CurvedText.js.
Download fabric.CurvedText.js
After that, you can set the angle.
Its working for me.

How to add a background color to Kinetic JS stage or layer?

I have a Kinetic JS stage and a layer
var stage = new Kinetic.Stage({
container: 'container',
width : STAGE_WIDTH,
height : STAGE_HEIGHT
});
var layer = new Kinetic.Layer();
I've set the page color to be #bbb.
body {
background: #bbb;
}
I'd like to set the canvas color to be white. But I can't seem to find a method or a way to add a background color to the stage itself or the layer that I add all the object on.

You can also set the background color of your container element through CSS. That's essentially the same as setting the background color of the stage. If you want a background at the layer level, you'll need to add a filled rectangle or similar, as previously mentioned.

I had the same problem, I wanted to add a "background". I added a rectagle with the 100% height and width, with this code:
var rect = new Kinetic.Rect({
x: 0,
y: 0,
width: stageDimensions.width, //full width
height: stageDimensions.height, //full height
fill: 'white', //background color
});
layer.add(rect);
Since I wanted to be able to remove the "background", this is how I manage to solve my problem.
Hope it helps you.

You can change the background color with JavaScript...
document.getElementById('container').style.background = '#fff';

There isn't an API method to add a background color.
Instead add a colored rectangle that covers the layer.
Of course, add the background rectangle before all other shapes.

Old question, but you can use the get properties of the stage, and fill a full rectangle, adding it to the layer before anything else. Sample code:
var stage = new Kinetic.Stage({
container: 'canvas-container',
width: 900,
height: 450
});
// create background
var stageBg = new Kinetic.Rect({
x: 0,
y: 0,
width: stage.getWidth(),
height: stage.getHeight(),
fill: "rgb(40,40,40)"
});
layer.add(stageBg);
stage.add(layer);