I have taken 2 canvas one is the source and another is ther target. When I mouse over the image in canvas it should get enlarged in canvas2
How can I increase the height of image in canvas2 i want magnify effect .Below is the code.
Thanks
Husein
<html>
<body>
<input type="button" onclick="h()">
<p>Image to use:</p>
<p>Canvas:</p>
<canvas id="myCanvas" onmousemove="h()" width="250" height="300" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>
<p>Canvas2:</p>
<canvas id="myCanvas2" width="100" height="100" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>
<script>
var image = new Image();
image.crossOrigin="anonymous";
image.src="img_the_scream.jpg"
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
var img=image ;
ctx.drawImage(img,0,0);
var d=document.getElementById("myCanvas2");
var ctx1=d.getContext("2d");
function h()
{
var img=ctx.getImageData(event.clientX-80,event.clientY-100,100,100);
ctx1.clearRect ( 0 , 0 , d.width , d.height );
ctx1.putImageData(img,0,0);
//d.width="200";
//d.height="200";
}
</script>
</body>
</html>
All you have to do is use toDataUrl and drawImage instead of getImageData and putImageData. Example:
function h() {
var img=new Image();
img.src = ctx.toDataUrl();
img.onload = function() {
ctx1.drawImage(img,0,0,c.width*horizontalMagnification,c.height*verticalMagnification);
};
}
Alternatively, you could just call ctx1.scale(horizontalMagnification,verticalMagnification); before you use putImageData.
Related
I have two canvases, which are overlaid. Now I want to load dynamically images into the canvases and adapt their size to the image size.
My problem now, is that after the canvases load the images and resize them self, they overlay all other html items below.
Here is the minimal example:
loadimage.onclick = function(e) {
//load image1
var img1 = new Image();
img1.onload = function() {
var canvas = document.getElementById("canvas1");
var ctx = canvas.getContext("2d");
//resize canvas1
canvas.width = this.naturalWidth;
canvas.height = this.naturalHeight;
ctx.drawImage(this, 0, 0);
};
img1.src = "https://via.placeholder.com/250/0000FF/808080/";
//load image2
var img2 = new Image();
img2.onload = function() {
var canvas = document.getElementById("canvas2");
var ctx = canvas.getContext("2d");
//resize canvas1
canvas.width = this.naturalWidth;
canvas.height = this.naturalHeight;
ctx.drawImage(this, 75, 75);
};
img2.src = "https://via.placeholder.com/50/00FF00/808080/";
}
<div id="container" style="position: relative; width: 200px; height: 100px;">
<canvas id="canvas1" width="200" height="100" style="position: absolute; left: 0; top: 0; z-index: 0; border: 1px solid #000;"></canvas>
<canvas id="canvas2" width="200" height="100" style="position: absolute; left: 0; top: 0; z-index: 1; border: 1px solid #000;"></canvas>
</div>
<button id="loadimage" type="button">Load Content</button>
After pressing the "Load Content"
button, the button doesn 't move down.
I tried to change also the width and height properties of the "container"
div, but the behaviour did not change.
What am I missing here ?
So, the code has many problems. If you are beginner, don't worry. That's normal. ☺
Firstly, <canvas> is pair tag. That means that you have to close it using </canvas>. The correct form is <canvas someattribute="somevalue"></canvas>. Inside the <canvas> tag is place for alternative content that will be used when the browser does not support the <canvas> tag (it is quite new).
Omitting the </canvas> broke the page.
HTML dictates what tags must be closed and what shouldn't and <canvas> is one of tags that must be closed. The Validator could help you identify mistakes in the code. Note that it is quite pedantic.
The second problem is that you were using absolute positioning and the canvases, when resized, overlaid the button. Simply disable the positioning or use some more precise way of positioning. The third option is to resize the container div appropriately in the JS.
The container div had also set fixed size. By default, when the content is larger, it overflows.
You were probably trying to solve it using z-index. Setting z-indexes is usually quite tricky and I try to use it as the last resort. Both your z-index properties were not valid. It is z-index: NUMBER, not z- index or z index.
And the last bug I have found was that you were using canvas1 (undefined variable) instead of canvas in the second function.
loadimage.onclick = function(e) {
//load image1
var img1 = new Image();
img1.onload = function() {
var canvas = document.getElementById("canvas1");
var ctx = canvas1.getContext("2d");
//resize canvas1
canvas.width = this.naturalWidth;
canvas.height = this.naturalHeight;
ctx.drawImage(this, 0, 0);
};
img1.src = "https://via.placeholder.com/250/0000FF/808080/";
//load image2
var img2 = new Image();
img2.onload = function() {
var canvas = document.getElementById("canvas2");
var ctx = canvas.getContext("2d");
//resize canvas1
canvas.width = this.naturalWidth;
canvas.height = this.naturalHeight;
ctx.drawImage(this, 0, 0);
};
img2.src = "https://via.placeholder.com/50/00FF00/808080/";
}
<div id="container">
<canvas id="canvas1" width="200" height="100" style="border: 1px solid #000;"></canvas>
<canvas id="canvas2" width="200" height="100" style="border: 1px solid #000;"></canvas>
</div>
<button id="loadimage" type="button">Load Content</button>
I'm trying to use an input into a search bar (length (in the code)) to draw a line of 'length' length.
I've set up a very rough canvas area, the search/variable input but can't seem to link them together. Currently, I have the variable in the lineTo direction and it does plot, but only remains static even if the variable is updated.
function myFunction() {
var length = document.getElementById("myText").value;
}
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
ctx.moveTo(100,25);
ctx.lineTo(length,25);
ctx.stroke();
<canvas id="myCanvas" width="500" height="50"
style="border:1px solid #d3d3d3;">
</canvas>
<input class="search" type="number" id="myText" value="Size...">
<button class="button" onclick="myFunction()">Size</button>
<p id="demo"></p>
The canvas interaction commands run once. To redraw each time, place the code inside the myFunction:
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
function myFunction() {
var length = document.getElementById("myText").value;
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.beginPath();
ctx.moveTo(100, 25);
ctx.lineTo(length, 25);
ctx.stroke();
ctx.closePath();
}
myFunction();
<canvas id="myCanvas" width="500" height="50" style="border:1px solid #d3d3d3;">
</canvas>
<input class="search" type="number" id="myText" value="Size...">
<button class="button" onclick="myFunction()">Size</button>
<p id="demo"></p>
I recommend
<canvas id="myCanvas" width="500" height="50"
style="border:1px solid #d3d3d3;">
</canvas>
<input class="search" type="number" id="myText">
<button class="button" onclick="myFunction()">Size</button>
<p id="demo"></p>
I removed "value="Size..."" I don't know if you had more intentions with that
var canvas = document.getElementById("myCanvas");
function myFunction() {
var length = document.getElementById("myText").value || 100;
var ctx = canvas.getContext("2d");
ctx.clearRect(0, 0, canvas.width, canvas.height);
ctx.beginPath();
ctx.moveTo(length,25);
ctx.lineTo(0,25);
ctx.stroke();
}
myFunction()
I am working on the below demo. Why am I not able to load the image into HTML canvas?
I am getting this error:
{
"message": "Uncaught TypeError: c.getContext is not a function",
"filename": "https://stacksnippets.net/js",
"lineno": 24,
"colno": 17
}
$(document).ready(function() {
var expose = function() {
var c = $("#myCanvas");
var ctx = c.getContext("2d");
var img = $("#scream");
ctx.drawImage(img, 10, 10);
};
setTimeout(expose, 2000);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>Image to use:</p>
<img id="scream" width="220" height="277" src="https://www.w3schools.com/tags/img_the_scream.jpg" alt="The Scream">
<p>Canvas:</p>
<canvas id="myCanvas" width="240" height="297" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.
</canvas>
Well because JQuery returns an object that contains the DOM elements, and using #myCanvas doesn't actually select the DOM element
$(document).ready(function() {
var expose = function() {
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
var img = document.getElementById("scream");
ctx.drawImage(img, 10, 10);
};
setTimeout(expose, 2000);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>Image to use:</p>
<img id="scream" width="220" height="277" src="https://www.w3schools.com/tags/img_the_scream.jpg" alt="The Scream">
<p>Canvas:</p>
<canvas id="myCanvas" width="240" height="297" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.
</canvas>
You need to make two changes:
var ctx = c[0].getContext("2d");
var img = document.getElementById('scream');
For the first:
jQuery equivalent of getting the context of a Canvas
And for the second, is expected you to pass an CSSImageValue or HTMLImageElement or SVGImageElement or HTMLVideoElement or HTMLCanvasElement or ImageBitmap or OffscreenCanvas, jQuery returns a jQuery object not a DOM element.
It should be like this
$(document).ready(function() {
var expose = function() {
var c = $("#myCanvas");
var ctx = c[0].getContext("2d");
var img = $("#scream");
ctx.drawImage(img, 10, 10);
};
setTimeout(expose, 2000);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<p>Image to use:</p>
<img id="scream" width="220" height="277" src="https://www.w3schools.com/tags/img_the_scream.jpg" alt="The Scream">
<p>Canvas:</p>
<canvas id="myCanvas" width="240" height="297" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.
</canvas>
I am creating a program where the user will upload an image and the program will display a div above the canvas and solved this problem already. But my problem is when I am trying to save/download the image, it will only save the canvas.
<div id="memePlaceHolder" style="height: 700px; width:700px;background:#BBB;">
<canvas id="c" width="0" height="0">
</canvas>
<div id="myTestDiv" name="myTestDiv">
<h1>#Test Hashtag</h1>
<br/>
<h2>My Test Display</h2>
</div>
</div>
I used this code to save/download the canvas.
e.downloadLink.href = e.c.toDataURL();
Is there a method to save the image together with the div displayed above it?
You can achieve that using a JavaScript library called html2canvas.
ᴅᴇᴍᴏ
let wrapper = document.querySelector('#wrapper');
let title = document.querySelector('#title');
let canvas = document.querySelector('#canvas');
let ctx = canvas.getContext('2d');
let img = new Image();
img.onload = function () {
ctx.drawImage(this, 0, 0, 150, 150);
}
img.crossOrigin = 'anonymous';
img.src = 'https://i.imgur.com/Q6aZlme.jpg';
function save() {
html2canvas(wrapper, {
onrendered: function (canvas) {
let a = document.createElement('a');
a.href = canvas.toDataURL();
a.download = 'myImage.png';
document.body.appendChild(a);
a.click();
document.body.removeChild(a);
}
});
}
#title {font: 16px Verdana;color: #07C}#canvas {border: 1px solid #ccc}
<script src="https://cdnjs.cloudflare.com/ajax/libs/html2canvas/0.4.1/html2canvas.min.js"></script>
<div id="wrapper">
<div id="title">DreiDreiDrei</div>
<canvas id="canvas" width="150" height="150"></canvas>
</div>
<button onclick="save()">Save as Image</button>
To learn more about the library, refer to the official documentation.
No, you can't save the div with the canvas element,
I can show the full content of canvas in an <img> tag using canvas.toDataURL() method.
I can get a part of image from canvas using getImageData() method and draw it in another canvas using putImageData() method.
The problem is, I want to show the part of image getting by getImageData() in an <img> tag as canvas.toDataURL() but I failed.
What I've tried so far is:
var canvas = $('canvas')[0];
var ctx = canvas.getContext("2d");
$('#baseImg').load(function() {
ctx.drawImage(this, 0, 0);
});
$('#full').click(function () {
$('div').html('');
var image = new Image();
image.onload = function() {
$('div').html(this);
};
image.src = canvas.toDataURL();
});
// here i failed
$('#partail').click(function () {
$('div').html('');
var image = new Image();
image.onload = function () {
$('div').html(this);
};
image.src = ctx.getImageData(10, 10, 50, 50);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h3>Canvas</h3>
<canvas id="canvas" width="100" height="100" style="border: 1px solid #000000;"></canvas>
<br/><br/>
<img id="baseImg" style="display: none;" src="data:image/png;base64,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/>
<input id="full" type="button" value="Show Full Image" />
<input id="partail" type="button" value="Show Partial Image" />
<h3>Image from canvas</h3>
<div style="border: 1px solid #000000; height: 100px; width: 100px;"></div>
You can use context.drawImage to draw a partial clipped rectangular part of your full image.
The clipping version of drawImage looks like this:
context.drawImage(imageObject,
XClipFromSource, YClipFromSource, widthToClipFromSource, heightToClipFromSource,
canvasX, canvasY, canvasWidth, canvasHeight
);
Here's example code and a demo:
<<===>>
var canvas=document.getElementById("canvas");
var ctx=canvas.getContext("2d");
var status=1;
var img=document.getElementById('baseImg');
$('#toggle').on('click',function(){
status*=-1;
draw();
});
draw();
//
function draw(){
if(status==1){
canvas.width=img.width;
canvas.height=img.height;
ctx.drawImage(img,0,0);
}else{
canvas.width=50;
canvas.height=50;
ctx.drawImage(img,10,10,50,50,0,0,50,50);
}
}
body{ background-color: ivory; }
#canvas{border:1px solid red; margin:0 auto; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<button id=toggle>Toggle img display</button>
<br>
<canvas id="canvas" width=300 height=300></canvas>
<img id="baseImg" style="display: none;" src="data:image/png;base64,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/>
I have solved my problem with the suggestions of everyone. I've used a temporary canvas to hold the part of main canvas and then get the partial image from it.
And my solution is:
var canvas = $('canvas')[0];
var ctx = canvas.getContext("2d");
$('#baseImg').load(function() {
ctx.drawImage(this, 0, 0);
});
$('#full').click(function() {
$('div').html('');
var image = new Image();
image.onload = function() {
$('div').html(this);
};
image.src = canvas.toDataURL();
});
$('#partail').click(function() {
$('div').html('');
var height = 50, width = 50;
var copyCanvas = $('<canvas id="canvas" width="' + width + '" height="' + height + '"></canvas>')[0];
var copyCtx = copyCanvas.getContext("2d");
copyCtx.putImageData(ctx.getImageData(10, 10, width, height), 0, 0);
var image = new Image();
image.onload = function() {
$('div').html(this);
};
image.src = copyCanvas.toDataURL();
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h3>Canvas</h3>
<canvas id="canvas" width="100" height="100" style="border: 1px solid #000000;"></canvas>
<br /><br />
<img id="baseImg" style="display: none;" 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<h3>Image from canvas</h3>
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