In fabric-js, i am making Group of Rect and text field and then adding it to the canvas. i am using following code , but can i change the Text of text field once it is added in canvas .
I have made Fiddle Please Check,
http://jsfiddle.net/HAb4N/5/
var canvas = new fabric.Canvas('c');
var Bar = new fabric.Text('Bar', {selectable: false, top: 50, left: 10});
var rect = new fabric.Rect({width: 100, height: 100, left: 100, top: 100, fill: 'red'});
var group = new fabric.Group([rect, Bar], {selectable: true, top: 50, left: 100});
canvas.add(group);
canvas.renderAll();
$(document).click(function(e) {
console.log('click');
console.log('ActiveObject', canvas.getActiveObject());
console.log('ActiveGroup', canvas.getActiveGroup());
Bar.set('Text','Selectedoooooooo');
});
This works for me:
Bar.setText("my_text");
canvas.renderAll();
When using the "set" function try camelcase for the first argument!
In other words change:
Bar.set('Text','Selectedoooooooo');
to:
Bar.set('text','Selectedoooooooo');
This works for me 🙏🏼
Use the new IText in FabricJS. Here is a nice solution
This is my answer to it
addText(color) {
color = color ? color : '#333';
let textEl = new fabric.IText('', {
fontFamily: 'Open Sans',
fill: color,
fontSize: 50
});
this.canvas.add(textEl).setActiveObject(textEl);
textEl.enterEditing();
}
Yes you can set text once it is added to canvas.Here is the jsfiddle
try changing your
Bar.set('Text','Selectedoooooooo');
to
Bar.setText('Selectedoooooooo');
Hope it helps....
You can access children of a group via getObjects() or item() methods:
canvas.on('object:selected', function(e) {
e.target.item(1).setText('Selectedoooooooo');
});
See http://jsfiddle.net/fabricjs/HAb4N/12/
Hope this will help select first object then enter text in text area
<canvas id="c" width="600" height="200"></canvas>
<textarea id="textinput" name="textarea" placeholder="Enter Text"> </textarea>
var canvas = new fabric.Canvas('c');
document.getElementById('textinput').addEventListener('keyup', function (e) {
var obj = canvas.getActiveObject();
if (!obj) return;
obj.setText(e.target.value);
canvas.renderAll();
});
var text = new fabric.Text('Your Text Here', { left: 400, top: 200,fill:'#A0A0A0'});
canvas.add(text);
var rect = new fabric.Rect({width: 100, height: 200, left: 200, top: 100, fill:'red'});
var group = new fabric.Group([rect,text], {selectable: true, top: 50, left: 350});
canvas.add(group);
canvas.renderAll();
Related
I am having trouble flipping or mirroring the object horizontally when the object itself is clicked on the FabricJS canvas.
I came close but it was mirroring the object when it was being resized too, which I didn't want.
I would guess I need to add the 'flipX: true' attribute to object on the first click and on the next click remove that attribute and so on with each click. Or maybe that is over complicating it and it can be done much easier with a flipX function I do not know.
I did find a Fiddle that flipped the object, but it was onclick of a button not the object itself.
I am struggling to solve this :\
My Fiddle
HTML:
<canvas id="canvas" width="400" height="300"></canvas>
JS:
var canvas = this.__canvas = new fabric.Canvas('canvas');
canvas.on('object:selected', function() {
toggle('flipX');
});
// create a rectangle
var rect = new fabric.Rect({
left: 50,
top: 50,
width: 100,
height: 50,
angle: 20,
fill: 'red'
});
canvas.add(rect);
canvas.renderAll();
You could accomplish that in the following way ...
var canvas = this.__canvas = new fabric.Canvas('canvas');
// mouse event
canvas.on('mouse:down', function(e) {
if (e.target) {
if (!e.target.__corner) {
e.target.toggle('flipX');
canvas.renderAll();
}
e.target.__corner = null;
}
});
// create a rectangle
var rect = new fabric.Rect({
left: 50,
top: 50,
width: 100,
height: 50,
angle: 20,
});
// set gradient (for demonstration)
rect.setGradient('fill', {
type: 'linear',
x1: -rect.width / 2,
y1: 0,
x2: rect.width / 2,
y2: 0,
colorStops: {
0: '#ffe47b',
1: 'rgb(111,154,211)'
}
});
canvas.add(rect);
rect.set('flipX', true);
canvas.renderAll();
body{margin:10px 0 0 0;overflow:hidden}canvas{border:1px solid #ccc}
<script src="http://cdnjs.cloudflare.com/ajax/libs/fabric.js/1.4.0/fabric.min.js"></script>
<canvas id="canvas" width="208" height="208"></canvas>
Same from above, different case.
Apply flip to background image
fabric.Image.fromURL('../' +ImageUrl, function (img02) {
Backcanvas.setBackgroundImage(img02, Backcanvas.renderAll.bind(Backcanvas), {
backgroundImageStretch: false,
top: 0,
left: 0,
originX: 'left',
originY: 'top',
flipY:'true'
});
Backcanvas.renderAll();
Backcanvas.backgroundImage.setCoords();
canvas.renderAll();
Backcanvas.renderAll();
}, { crossOrigin: 'anonymous' });
I am using fabricjs in my project but I want to show the radius of the circle on the fabric. Could I ask how to do this. There could be up to 20 circles which I will need this information for and the circles will have controls on so they can be expanded with the radius text adjusting to compensate.
http://jsfiddle.net/wayneker/a3q5c40r/
var canvas = new fabric.Canvas('canvas');
var circle = new fabric.Circle({
left: 50,
top: 50,
fill: "",
radius: 40,
hasControls: false,
hasRoatatingPoint: false,
stroke: 'red',
strokeWidth: 1
});
canvas.add(circle);
If this isn't possible, can a user set the radius via an input?
I'm not really sure what you are trying to do. In the example below I have a button that ads a group to the canvas of a circle and text box. When one of those groups are selected a range input appears that lets you change the radius. on change we reach in to the group and update the text and radius of the circle.
window.canvas = new fabric.Canvas('canvas');
function getCircleGroup(radius = 40) {
var text = new fabric.Text(radius.toString(), {
left: 50,
top: 50,
});
var circle = new fabric.Circle({
left: 50,
top: 50,
fill: "",
radius: radius,
hasControls: false,
hasRoatatingPoint: false,
stroke: 'red',
strokeWidth: 1
});
return new fabric.Group([ circle, text ], {
lockScalingX: true,
lockScalingY: true,
});
}
var button = document.querySelector('button');
button.addEventListener('click', () => {
var group = getCircleGroup();
canvas.add(group);
canvas.setActiveObject(group);
canvas.renderAll();
});
canvas.on('object:selected', (o) => {
var r = document.querySelector('.radiusChange');
r.style.display = 'block';
r.querySelector('input').value = o.radius;
})
canvas.on('selection:cleared', () => {
var r = document.querySelector('.radiusChange');
r.style.display = 'none';
});
var radiusChanger = document.querySelector('.radiusChange input')
radiusChanger.addEventListener('change', (e) => {
var group = canvas.getActiveObject();
var top = group.top;
var left = group.left;
group.item(0).setRadius(parseInt(e.target.value));
group.item(1).text = e.target.value;
group._calcBounds();
group._updateObjectsCoords();
group.top = top;
group.left = left;
canvas.renderAll();
})
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/1.6.6/fabric.min.js"></script>
<button>add circle</button>
<div class="radiusChange" style="display:none;">
<br />change radius: <input type="range" max=100 min=10 step=1 /></div>
<canvas id="canvas" width="300" height="300" style="border:1px solid;"></canvas>
When I remove the object and click on canvas element , the removed shape re-appears and I am not able to select it also.
var delete = function(){
var canvas = document.getElementById("canvas").fabric;
canvas.remove(canvas.getActiveObject());
}
You have to register an handler to object selection on canvas, then remove the object.
Check the runnable snippet below if could work for your needs:
$(function() {
var canvas = new fabric.Canvas('c')
var operation = '';
var circle = new fabric.Circle({
radius: 20,
fill: 'green',
left: 100,
top: 100
});
var triangle = new fabric.Triangle({
width: 20,
height: 30,
fill: 'blue',
left: 50,
top: 50
});
canvas.add(circle, triangle);
canvas.on('object:selected', doOperationHandler);
function doOperationHandler() {
if (operation == 'remove') {
remove();
}
}
function remove() {
canvas.remove(canvas.getActiveObject());
}
$('#btn_select').on('click', function() {
operation = '';
});
$('#btn_delete').on('click', function() {
operation = 'remove';
});
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/1.6.4/fabric.min.js"></script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<canvas id='c'>
</canvas>
<button id='btn_select'>Select</button>
<button id='btn_delete'>Delete</button>
I'm trying to develop a way to select objects that are layered below and (totally) covered by other objects. One idea is to select the top object and then via doubleclick walk downwards through the layers. This is what I got at the moment:
var canvas = new fabric.Canvas("c");
fabric.util.addListener(canvas.upperCanvasEl, "dblclick", function (e) {
var _canvas = canvas;
var _mouse = _canvas.getPointer(e);
var _active = _canvas.getActiveObject();
if (e.target) {
var _targets = _canvas.getObjects().filter(function (_obj) {
return _obj.containsPoint(_mouse);
});
//console.warn(_targets);
for (var _i=0, _max=_targets.length; _i<_max; _i+=1) {
//check if target is currently active
if (_targets[_i] == _active) {
//then select the one on the layer below
_targets[_i-1] && _canvas.setActiveObject(_targets[_i-1]);
break;
}
}
}
});
canvas
.add(new fabric.Rect({
top: 25,
left: 25,
width: 100,
height: 100,
fill: "red"
}))
.add(new fabric.Rect({
top: 50,
left: 50,
width: 100,
height: 100,
fill: "green"
}))
.add(new fabric.Rect({
top: 75,
left: 75,
width: 100,
height: 100,
fill: "blue"
}))
.renderAll();
canvas {
border: 1px solid;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/1.6.3/fabric.min.js"></script>
<canvas id="c" width="300" height="200"></canvas>
As you can see, trying to select the red rectangle from within the blue one is not working. I'm only able to select the green or the blue. I guess that after the first doubleclick worked (green is selected), clicking again just selects blue so the following doubleclick is only able to get green again.
Is there a way around this? Any other ideas?
After some time I finally was able to solve that by myself. Clicking on an object brings it to the top. On double-clicking I try to get the object one layer behind the current object. On another dblclick I get the one behind and so on. Works great for me and also allows for the selection of fully covered objects without the need to move others.
var canvas = new fabric.Canvas("c");
canvas.on("object:selected", function (e) {
if (e.target) {
e.target.bringToFront();
this.renderAll();
}
});
var _prevActive = 0;
var _layer = 0;
//
fabric.util.addListener(canvas.upperCanvasEl, "dblclick", function (e) {
var _canvas = canvas;
//current mouse position
var _mouse = _canvas.getPointer(e);
//active object (that has been selected on click)
var _active = _canvas.getActiveObject();
//possible dblclick targets (objects that share mousepointer)
var _targets = _canvas.getObjects().filter(function (_obj) {
return _obj.containsPoint(_mouse) && !_canvas.isTargetTransparent(_obj, _mouse.x, _mouse.y);
});
_canvas.deactivateAll();
//new top layer target
if (_prevActive !== _active) {
//try to go one layer below current target
_layer = Math.max(_targets.length-2, 0);
}
//top layer target is same as before
else {
//try to go one more layer down
_layer = --_layer < 0 ? Math.max(_targets.length-2, 0) : _layer;
}
//get obj on current layer
var _obj = _targets[_layer];
if (_obj) {
_prevActive = _obj;
_obj.bringToFront();
_canvas.setActiveObject(_obj).renderAll();
}
});
//create something to play with
canvas
//fully covered rect is selectable with dblclicks
.add(new fabric.Rect({
top: 75,
left: 75,
width: 50,
height: 50,
fill: "black",
stroke: "black",
globalCompositeOperation: "xor",
perPixelTargetFind: true
}))
.add(new fabric.Circle({
top: 25,
left: 25,
radius: 50,
fill: "rgba(255,0,0,.5)",
stroke: "black",
perPixelTargetFind: true
}))
.add(new fabric.Circle({
top: 50,
left: 50,
radius: 50,
fill: "rgba(0,255,0,.5)",
stroke: "black",
perPixelTargetFind: true
}))
.add(new fabric.Circle({
top: 75,
left: 75,
radius: 50,
fill: "rgba(0,0,255,.5)",
stroke: "black",
perPixelTargetFind: true
}))
.renderAll();
canvas {
border: 1px solid;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/1.6.4/fabric.min.js"></script>
<canvas id="c" width="300" height="200"></canvas>
Just add one property during adding object to the canvas.
perPixelTargetFind: true
My task is a bit different - the mission is to pick the overlapping obj behind the current one:
[Left-click]+[Cmd-Key] on an selected-object to pick the first overlapping object which is right behind it.
If no overlapping objs are found, restart the search from top-layer
The idea is, for each click-event, intercept the selected object and replace it with our desired object.
A Fabric mouse-down event is like this:
User clicks on canvas
On canvas: find the target-obj by the coordinates of mouse cursor and stores it in the instance-variable (canvas._target)
Run event-handlers for mouse:down:before
Compare the target-obj found from step(2) with current selected object, fire selection:cleared/update/create events according to the results of comparison.
Set new activeObject(s)
Run event-handlers for mouse:down
We can use a customized event handler on mouse:down:before to intercept the target-obj found on Step(2) and replace it by our desired-object
fCanvas = new fabric.Canvas('my-canvas', {
backgroundColor: '#cbf1f1',
width: 800,
height: 600,
preserveObjectStacking: true
})
const r1 = new fabric.Rect({ width: 200, height: 200, stroke: null, top: 0, left: 0, fill:'red'})
const r2 = new fabric.Rect({ width: 200, height: 200, stroke: null, top: 50, left: 50, fill:'green'})
const r3 = new fabric.Rect({ width: 200, height: 200, stroke: null, top: 100, left: 100, fill:'yellow'})
fCanvas.add(r1, r2, r3)
fCanvas.requestRenderAll()
fCanvas.on('mouse:down:before', ev => {
if (!ev.e.metaKey) {
return
}
// Prevent conflicts with multi-selection
if (ev.e[fCanvas.altSelectionKey]) {
return
}
const currActiveObj = fCanvas.getActiveObject()
if (!currActiveObj) {
return
}
const pointer = fCanvas.getPointer(ev, true)
const hitObj = fCanvas._searchPossibleTargets([currActiveObj], pointer)
if (!hitObj) {
return
}
let excludeObjs = []
if (currActiveObj instanceof fabric.Group) {
currActiveObj._objects.forEach(x => { excludeObjs.push(x) })
} else {
// Target is single active object
excludeObjs.push(currActiveObj)
}
let remain = excludeObjs.length
let objsToSearch = []
let lastIdx = -1
const canvasObjs = fCanvas._objects
for (let i = canvasObjs.length-1; i >=0 ; i--) {
if (remain === 0) {
lastIdx = i
break
}
const obj = canvasObjs[i]
if (excludeObjs.includes(obj)) {
remain -= 1
} else {
objsToSearch.push(obj)
}
}
const headObjs = canvasObjs.slice(0, lastIdx+1)
objsToSearch = objsToSearch.reverse().concat(headObjs)
const found = fCanvas._searchPossibleTargets(objsToSearch, pointer)
if (found) {
fCanvas._target = found
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/4.3.1/fabric.min.js"></script>
<html>
<h4>Left-click + Cmd-key on overlapping area to pick the obj which is behind current one</h4>
<canvas id="my-canvas"></canvas>
</html>
The Problem
I want to do this with an image instead of a canvas object. Meaning you have to add the thing you want to add TO AND AS A PART of the canvas before you can add it. The images are actually part of the website so it doesn't need to do some intricate stuff. This code I found here only works for when it's an object not an actual element. And by the way I'm using FabricJS just to let you know that I'm not using the default HTML5 canvas stuff.
As for any alternatives that are possibly going to work without using my current code. Please do post it down below in the comments or in the answers. I would really love to see what you guys got in mind.
Summary
Basically I want to be able to drag and drop images through the canvas while retaining the mouse cursor position. For example if I drag and image and the cursor was at x: 50 y: 75 it would drop the image to that exact spot. Just like what the code I found does. But like the problem stated the CODE uses an object for you to drag it to the canvas then it clones it. I want this functionality using just plain old elements. E.g: <img>.
THE CODE -
JsFiddle
window.canvas = new fabric.Canvas('fabriccanvas');
var edgedetection = 8; //pixels to snap
canvas.selection = false;
window.addEventListener('resize', resizeCanvas, false);
function resizeCanvas() {
canvas.setHeight(window.innerHeight);
canvas.setWidth(window.innerWidth);
canvas.renderAll();
}
// resize on init
resizeCanvas();
//Initialize Everything
init();
function init(top, left, width, height, fill) {
var bg = new fabric.Rect({
left: 0,
top: 0,
fill: "#eee",
width: window.innerWidth,
height: 75,
lockRotation: true,
maxHeight: document.getElementById("fabriccanvas").height,
maxWidth: document.getElementById("fabriccanvas").width,
selectable: false,
});
var squareBtn = new fabric.Rect({
top: 10,
left: 18,
width: 40,
height: 40,
fill: '#af3',
lockRotation: true,
originX: 'left',
originY: 'top',
cornerSize: 15,
hasRotatingPoint: false,
perPixelTargetFind: true,
});
var circleBtn = new fabric.Circle({
radius: 20,
fill: '#f55',
top: 10,
left: 105,
});
var triangleBtn = new fabric.Triangle({
width: 40,
height: 35,
fill: 'blue',
top: 15,
left: 190,
});
var sqrText = new fabric.IText("Add Square", {
fontFamily: 'Indie Flower',
fontSize: 14,
fontWeight: 'bold',
left: 6,
top: 50,
selectable: false,
});
var cirText = new fabric.IText("Add Circle", {
fontFamily: 'Indie Flower',
fontSize: 14,
fontWeight: 'bold',
left: 95,
top: 50,
selectable: false,
});
var triText = new fabric.IText("Add Triangle", {
fontFamily: 'Indie Flower',
fontSize: 14,
fontWeight: 'bold',
left: 175,
top: 50,
selectable: false,
});
var shadow = {
color: 'rgba(0,0,0,0.6)',
blur: 3,
offsetX: 0,
offsetY: 2,
opacity: 0.6,
fillShadow: true,
strokeShadow: true
};
window.canvas.add(bg);
bg.setShadow(shadow);
window.canvas.add(squareBtn);
window.canvas.add(circleBtn);
window.canvas.add(triangleBtn);
window.canvas.add(sqrText);
window.canvas.add(cirText);
window.canvas.add(triText);
canvas.forEachObject(function (e) {
e.hasControls = e.hasBorders = false; //remove borders/controls
});
function draggable(object) {
object.on('mousedown', function() {
var temp = this.clone();
temp.set({
hasControls: false,
hasBorders: false,
});
canvas.add(temp);
draggable(temp);
});
object.on('mouseup', function() {
// Remove an event handler
this.off('mousedown');
// Comment this will let the clone object able to be removed by drag it to menu bar
// this.off('mouseup');
// Remove the object if its position is in menu bar
if(this.top<=75) {
canvas.remove(this);
}
});
}
draggable(squareBtn);
draggable(circleBtn);
draggable(triangleBtn);
this.canvas.on('object:moving', function (e) {
var obj = e.target;
obj.setCoords(); //Sets corner position coordinates based on current angle, width and height
canvas.forEachObject(function (targ) {
activeObject = canvas.getActiveObject();
if (targ === activeObject) return;
if (Math.abs(activeObject.oCoords.tr.x - targ.oCoords.tl.x) < edgedetection) {
activeObject.left = targ.left - activeObject.currentWidth;
}
if (Math.abs(activeObject.oCoords.tl.x - targ.oCoords.tr.x) < edgedetection) {
activeObject.left = targ.left + targ.currentWidth;
}
if (Math.abs(activeObject.oCoords.br.y - targ.oCoords.tr.y) < edgedetection) {
activeObject.top = targ.top - activeObject.currentHeight;
}
if (Math.abs(targ.oCoords.br.y - activeObject.oCoords.tr.y) < edgedetection) {
activeObject.top = targ.top + targ.currentHeight;
}
if (activeObject.intersectsWithObject(targ) && targ.intersectsWithObject(activeObject)) {
} else {
targ.strokeWidth = 0;
targ.stroke = false;
}
if (!activeObject.intersectsWithObject(targ)) {
activeObject.strokeWidth = 0;
activeObject.stroke = false;
activeObject === targ
}
});
});
}
More codes that I found but doesn't answer my problem:
var canvas = new fabric.Canvas('c');
canvas.on("after:render", function(){canvas.calcOffset();});
var started = false;
var x = 0;
var y = 0;
var width = 0;
var height = 0;
canvas.on('mouse:down', function(options) {
//console.log(options.e.clientX, options.e.clientY);
x = options.e.clientX;
y = options.e.clientY;
canvas.on('mouse:up', function(options) {
width = options.e.clientX - x;
height = options.e.clientY - y;
var square = new fabric.Rect({
width: width,
height: height,
left: x + width/2 - canvas._offset.left,
top: y + height/2 - canvas._offset.top,
fill: 'red',
opacity: .2
});
canvas.add(square);
canvas.off('mouse:up');
$('#list').append('<p>Test</p>');
});
});
This code adds a rectangle to the canvas. But the problem is this doesn't achieve what I want which is basically, as previously stated, that I want to be able to drag an img element and then wherever you drag that image on the canvas it will drop it precisely at that location.
CREDITS
Fabric JS: Copy/paste object on mouse down
fabric.js Offset Solution
it doesn't need to do some intricate stuff.
A logical framework under which to implement image dragging might be to monitor mouse events using event listeners.
On mouse down over an Image element within the page but not over the canvas, record which image element and the mouse position within the image. On mouse up anywhere set this record back to null.
On mouse over of the canvas with a non empty image record, create a Fabric image element from the Image element (as per documentation), calculate where it goes from the recorded image position and current mouse position, paste it under the mouse, make it draggable and simulate the effect of a mouse click to continue dragging it.
I have taken this question to be about the design and feasibility stages of program development.