http://openlayers.org/en/latest/examples/custom-controls.html?q=custom
This is a good example of how to create a custom control but I can't seem to make it work with an image.
The image I want to include in the custom control is here
Also, I don't want the image to do anything, just be there in a corner.
Custom controls are basically just DOM elements with event handlers, so all you need to do is create an element and apply a little CSS to it.
customControl = function(opt_options) {
var element = document.createElement('div');
element.className = 'custom-control ol-unselectable ol-control';
ol.control.Control.call(this, {
element: element
});
};
ol.inherits(customControl, ol.control.Control);
var map = new ol.Map({
layers: [new ol.layer.Tile({source: new ol.source.OSM()})],
controls: [new customControl],
target: 'map',
view: new ol.View({
center: [-11000000, 4600000],
zoom: 4
})
});
CSS:
.custom-control {
top: 20px;
right: 20px;
width: 70px;
height: 70px;
background: no-repeat url('http://openlayers.org/en/latest/examples/resources/logo-70x70.png')
}
Related
I'm using FabricJS in my web application. As I draw shapes, I notice that the control widget for all the objects are rectangular. Can the shape of a control widget be modified to fit the actual shape of the object? Say, a circle with a circular control widget.
I went through the Controls Customization demo. But there is no option to modify the shape of a control widget.
I need to modify the shape of the control widgets for the following purpose:
In my application whenever an object is clicked, its fill colour is toggled between black and white. In this case(refer the image below), because the circle has a rectangular control widget, clicking the pointed pixel selects the circle instead of the rectangle. I also hide the control widget from appearing by using hasControls property. So, the user will not know anything about the control widget. So, is the shape of the control widget editable?
I don't think there is an easy way to do that with fabric.js without writing a whole bunch of extra code. Fabric.js always draws a rectangle bounding box and uses it for selection controls. However, since you're planning on hiding the controls anyway, it sounds like you might be better off using perPixelTargetFind.
When true, object detection happens on per-pixel basis rather than on
per-bounding-box
Here's a quick demo:
const canvas = new fabric.Canvas('c', {
preserveObjectStacking: true,
perPixelTargetFind: true
})
const circle = new fabric.Circle({
radius: 50,
left: 50,
top: 50,
stroke:'green',
fill: 'white',
hasControls: false,
hasBorders: false
})
const rect = new fabric.Rect({
width: 200,
height: 150,
left: 50,
top: 25,
stroke: 'green',
fill: 'black',
hasControls: false,
hasBorders: false
})
canvas.on('mouse:down', (e) => {
const obj = e.target
if (obj) {
obj.set({
fill: obj.fill === 'white' ? 'black' : 'white'
})
canvas.requestRenderAll()
}
})
canvas.add(circle, rect)
circle.bringToFront()
canvas.requestRenderAll()
body {
background: ivory;
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/3.4.0/fabric.min.js"></script>
<canvas id="c" width="300" height="200"></canvas>
I want a scrollbar for a label when the label more then the chart height. I mentioned in image where I want scrollbar. Actually sometime I have many labels therefore.
As described in the Documentation here:
https://www.amcharts.com/docs/v4/tutorials/chart-legend-in-an-external-container/#Making_legend_scrollable
You need to put the Legend into an external div thats inside a wrapper div.
The Div Structure:
<div id="legendwrapper">
<div id="legenddiv"></div>
</div>
Putting the legend in the external div:
var legendContainer = am4core.create("legenddiv", am4core.Container);
legendContainer.width = am4core.percent(100);
legendContainer.height = am4core.percent(100);
Then you can make it scrollable by styling it like this:
#legenddiv {
width: 150px;
}
#legendwrapper {
max-width: 120px;
overflow-x: none;
overflow-y: auto;
}
A simple way to do this with AMCharts 4
chart.legend = new am4charts.Legend();
chart.legend.position = "right"; // Positionning your legend to the right of the chart
chart.legend.scrollable = true: // Make it scrollable
See a full example as below :
https://codepen.io/team/amcharts/pen/eYmLvoR
I want to make free drawing on top of shapes at konvajs. like an exp; Can u give me advise about shapes attrs like zindex or smt.
https://ibb.co/jq9pUK
Your question is very broad and you are not showing what you have tried so far. You would get better help faster if you give a clear description and post cut-down sample code for your questions.
Konvajs works on top of the HTML5 canvas. When working with a konvajs you put shapes, lines, images and text on to layers. Layers have a z-order and shapes on a layer have a z-order.
To answer your question, I would follow the pattern:
- create the stage
- create the shape layer
- add the shapes to the shape layer - triangles, rectangles, circles, etc
- add another layer for the freehand drawing
- draw on this layer.
Because of the sequence of adding the components to the canvas the z-order will support what you ask for in your question. If you wanted the drawing to happen 'behind' the shapes you would create the layers in the opposite sequence.
The working snippet below shows how to do the steps that I have listed above, and how to listen for the events you need to make it operate. You can extend from this starter code to handle erasing, selecting line colour, thickness, and stroke style. See the Konvajs drawing tutorial for more information.
Good luck.
// Set up the canvas / stage
var s1 = new Konva.Stage({container: 'container1', width: 300, height: 200});
// Add a layer for the shapes
var layer1 = new Konva.Layer({draggable: false});
s1.add(layer1);
// draw a cirlce
var circle = new Konva.Circle({
x: 80,
y: s1.getHeight() / 2,
radius: 70,
fill: 'red',
stroke: 'black',
strokeWidth: 4
})
layer1.add(circle)
// draw a wedge.
var wedge = new Konva.Wedge({
x: 200,
y: s1.getHeight() / 2,
radius: 70,
angle: 60,
fill: 'gold',
stroke: 'black',
strokeWidth: 4,
rotation: -120
});
layer1.add(wedge)
// Now add a layer for freehand drawing
var layer2 = new Konva.Layer({draggable: false});
s1.add(layer2);
// Add a rectangle to layer2 to catch events. Make it semi-transparent
var r = new Konva.Rect({x:0, y: 0, width: 300, height: 200, fill: 'blue', opacity: 0.1})
layer2.add(r)
// Everything is ready so draw the canvas objects set up so far.
s1.draw()
var drawingLine = null; // handle to the line we are drawing
var isPaint = false; // flag to indicate we are painting
// Listen for mouse down on the rectangle. When we get one, get a new line and set the initial point
r.on('mousedown touchstart', function () {
isPaint = true;
var pos = s1.getPointerPosition();
drawingLine = newLine(pos.x, pos.y);
drawingLine.points(drawingLine.points().concat(pos.x,pos.y));
layer2.draw();
});
// Listen for mouse up ON THE STAGE, because the mouseup will not fire on the rect because the mouse is actually over the line point we just drew when it is released.
s1.on('mouseup touchend', function () {
isPaint = false;
drawingLine = null;
});
// when the mouse is moved, add the position to the line points and refresh the layer to see the effect.
r.on('mousemove touchmove', function () {
if (!isPaint) {
return;
}
var pos = s1.getPointerPosition();
drawingLine.points(drawingLine.points().concat(pos.x,pos.y));
layer2.draw();
})
// Function to add and return a line object. We will extend this line to give the appearance of drawing.
function newLine(x,y){
var line = new Konva.Line({
points: [x,y,x,y],
stroke: 'limegreen',
strokeWidth: 4,
lineCap: 'round',
lineJoin: 'round'
});
layer2.add(line)
return line;
}
p
{
padding: 4px;
}
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<script src="https://cdn.rawgit.com/konvajs/konva/1.6.5/konva.min.js"></script>
<p>Click & drag on the canvas to draw a line over the shapes.
</p>
<div id='container1' style="display: inline-block; width: 300px, height: 200px; background-color: silver; overflow: hidden; position: relative;"></div>
I need for Fine Uploader to be able to drawThumbnail as a background image or to otherwise create scaled and cropped squares.
Basically, I am trying to reproduce the behavior I used in angularjs / flowjs, which was (more or less):
// I modified flowjs to set the background-image here instead of src with the base64 image.
<div ng-repeat="file in $flow.files" flow-img background-size: 'cover'">
This is the API on how to draw a thumbnail, but it specifically states that it returns a img or canvas. Instead, I'd like it set to the css property background-image.
http://docs.fineuploader.com/branch/master/api/methods.html#drawThumbnail
This solution gets close, but does not achieve the same effect as background-size: cover.
#image {
width: 33%;
padding-top: 33%;
position: relative;
}
#image canvas {
position: absolute;
top: 0;
bottom: 0;
}
...
callbacks: {
onSubmit: function(id, fileName) {
var canvas = document.createElement('canvas');
canvas.width = 500;
canvas.height = 500;
$('#image').html(canvas);
this.drawThumbnail(id, canvas, 500, false);
}
Using the UI mode give me exactly the same issue, I can only use it as the src like so:
<img class="qq-thumbnail-selector" qq-max-size="100" qq-server-scale>
This is my preferred solution...
#image {
width: 33%;
padding-top: 33%;
position: relative;
background-size: cover;
}
...
callbacks: {
onSubmit: function(id, fileName) {
this.drawThumbnail(); // somehow onto the background property of #image
}
Another solution, if widely adapted, would be to use elements as backgrounds (because then I could use the canvas for the #image background), but as of right now this is not a practical solution:
https://developer.mozilla.org/en-US/docs/Web/CSS/element
Another solution would be to watch for changes on the $('#image img').attr('src'). Hide the img element and set the background-image of #image on change. But, that's another ridiculous solution when the encoded image is right there.
If there isn't already a way to do this with fine uploader, why restrict the element of type img? Why not take any element and any attribute? Why not just return the base64 image and let us set it to any attribute?
Thanks in advance.
It sounds like the easiest solution would be to ask Fine Uploader to generate a thumbnail, pass the API method a temporary <img>, grab the src attribute from the <img> and use that to construct the background-image.
For example:
callbacks: {
onSubmit: function(id) {
var tempImg = document.createElement('img'),
self = this;
this.drawThumbnail(id, tempImg, 500).then(function() {
var fileContainerEl = self.getItemByFileId(id);
previewImg = fileContainerEl.getElementsByClassName('previewImg')[0];
previewImg.style['background-image'] = 'url("' + tempImg.src + '")';
});
}
I am trying to convert an image to another color using kineticjs, actually my image will be on a layer and also a png one can i change only the image objects color? any help will be very greatful
You can replace non-transparent pixels with a new color using compositing.
In particular source-atop compositing will replace all existing non-transparent pixels with any color you draw.
KineticJS does not currently offer compositing out-of-the-box, but you can easily use an html5 Canvas element to do the compositing and then use that element as an image source for a Kinetic.Image element.
Here's example code and a Demo:
var stage = new Kinetic.Stage({
container: 'container',
width: 350,
height: 350
});
var layer = new Kinetic.Layer();
stage.add(layer);
var canvas=document.createElement('canvas');
var ctx=canvas.getContext('2d');
var kImage;
var img=new Image();
img.onload=start;
img.src="https://dl.dropboxusercontent.com/u/139992952/multple/flower.png";
function start(){
cw=canvas.width=img.width;
ch=canvas.height=img.height;
ctx.drawImage(img,0,0);
kImage=new Kinetic.Image({
image:canvas,
width:img.width,
height:img.height,
draggable:true,
});
layer.add(kImage);
layer.draw();
document.getElementById('makeGreen').onclick=function(){
ctx.globalCompositeOperation='source-atop';
ctx.fillStyle='lightgreen';
ctx.fillRect(0,0,cw,ch);
layer.draw();
};
document.getElementById('makeOriginal').onclick=function(){
ctx.globalCompositeOperation='source-over';
ctx.drawImage(img,0,0);
layer.draw();
};
}
body{padding:20px;}
#container{
border:solid 1px #ccc;
margin-top: 10px;
width:350px;
height:350px;
}
<script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v5.1.0.min.js"></script>
<button id=makeGreen>Green</button>
<button id=makeOriginal>Original</button>
<div id="container"></div>