Drawing and writing on image and save it - javascript

I have images hosted on the server, and I would like develop some functionality to let the user have possibility to draw over the picture.
They need to write some text too, and, finally save the result as picture.
Finally, its a simple editor, but I don't find JavaScript library who permit it...
You can see an example of final result I need here : https://nsa40.casimages.com/img/2019/08/29/190829023122267348.jpg

You can achieve this with the Canvas API pretty easily.
Your images can be pulled into the canvas by creating a new Image object. The canvas API itself has a lot of methods for doing the things shown on the image (drawing shapes like ellipses and rasterising text).
Finally a canvas can be saved into a png using the toDataURL method.
I am sure if you dig around the internet, you will find there are already some libraries for these sorts of things. Possibly some keywords to try would be "image editing library JS" or something of that sort. Developing the functionality on your own should be ok if you follow some examples online for how to do each individual bit. Hope this helps :)

Related

Looking for video timeline functionality like clideo

I'm looking to implement a video editing feature like that of featured here https://clideo.com/video-editor.
I'm planning to use Vue 3 with a Laravel backend, but is there an ideal framework to use for a web application like this, or should I just try to reverse engineer/hack my way to a working implementation?
Sorry if this is the wrong place to ask, I just haven't been able to find an answer.
Thanks
Video editor consist of two important parts
1)A Timeline that represents sequence.
2)A Output window to show output of timeline.
-Clideo uses div and html elements positioning to generate timeline but a better alternative is to use Canvas and draw a timeline on it just like in veed.io
-For video output again you have to use canvas and webGL to draw each and every frame one by one.
you wont be able to edit video on backend and send edited multimedia for each change user makes you need to find a way to do in on client using webcodec.
For the choice of framework if you are having canvas and webGL do all the rendering of timeline and output then it dosent matters you will spend more time with drawing functions.
Almost every video editor has a timeline. But only in some of it (https://wave.video/tools/video-marketing/promo-video-maker) is divided into several ranges. An additional advantage will be the grid on the line. You can also easily manage layers and frames.

How to generate polygon dimensions with the least effort?

I found this page https://www.bridgersteel.com/metal-colors/roof-visualizer where there is an interactive way to change the color of a demo house and see how it looks like.
As far as I know, they used a pretty straightforward and simple way of doing this.
However, what I don't understand is how did they produced the exact super-precise polygon points. Is there a non-manual way of doing this?
Otherwise, even basic, this job requires ton of days to be made...
Do you have any hints?
I'm going to guess they used vector graphics software, like Adobe Illustrator, to create the svg. Depending on the software, you can even see the code it generates. You can also convert an svg image to code using javascript on the website itself.
I visited the page and came up with the following in the link below.
https://drive.google.com/open?id=1PQimeXKGyCJd1lNZHHHuOkOhLc3oq97v

How to create an online drawing application

I've tried to ask this question before, but I failed completely there. After useful input, I decided to leave that one, and to try again.
I'm looking to create a web-based application where users can draw images built from a set of pre-defined icons. There is a need to be able to save the final image (encoded jpg/png), and also save a "current setup" that can be re-loaded later for further editing (a "settings" file?).
My question : What would be the best approach for this matter? Flash+AS3? HTML5+JS? Something else?
For better understanding of what I want to create, here are 2 screenshots that illustrate in what direction I'm thinking:
The drawing application (made in Flash): http://imgur.com/U4GNKJF
The final created picture: http://imgur.com/aCtxwo1
Thanks in advance, and I really hope I've made my question more clear this time.
Since you need advice...
Draw your icons in some art software (even online) and save as transparent PNG's
Look-up HTML5 Drag & drop tutorials that involve "Canvas". You'll want to meaure the positions of objects dragged (mouse position on Canvas) and their order. The drag function could update a JSON String (this hold entries of items, type, position, etc)
Look-up How to save JSON as text file, also how to parse text file as JSON. This becomes the "settings file".
To save images best use PHP language code. PHP must be installed on the server (most have, or is installable or else get a better host). There are tutorials on how to save an image with content from "snapshot of Canvas"
flash is unsupported on IOS and android mobile browsers and google is giving a lower index to websites using it.
I would use javascript with HTML5 canvas with PIXI.JS ,CreateJS or PANDA.JS.
These libraries make it easier to create the canvas elements you need (draggable objects, buttons ) from sprites and adding event listeners to them.
And drawing graphics on the canvas (lines, shapes).
Since you have a lot of sprites you can pack them in a spritesheet with TexturePacker for faster loading ( and PIXI works great with spritesheets).
You can package this web page to android/ios with phonegap,ionic,crosswalk, cocoonjs etc ( i recommend ionic + crosswalk webview it gives great performance)
for saving i would also use a json file to save the setting . You can use PHP to load and save it.

HTML5 combine multiple canvas and update in realtime

I am trying to combine canvas that change colour in response to consumer's choice. I have placed PNG's onto multiple canvas with transparent backgrounds. I need to combine them and save a png of the final image to pass to the basket and post to my server. Can anyone help? You can see the page and code at http://www.ewe.potberrys.com/colour_image_3.php. Please excuse the quality of the code. I am new :) Thanks
I would suggest do not save the PNG. Just save the colors with your order (you have to do it anyways) and render the helmet in the basket with the same approach you do in the selector tool.
It would probably be possible (but I am not 100% sure) to generate an image on the client side in Chrome and post it via a hidden form, but the stack is so experimental, that it is not ready for production.
A little easier, one can do it with ImageMagic and PHP on the server side. I am not a PHP expert, but you can easily google an example code - there is plenty.
My advice: do not bother. Just have tidy up your JavaScript that renders a helmet to be usable in multiple places with multiple dimensions.

Flash based cropper like this, but with source or customizable?

I am looking for a Flash based image uploader with resize and possibly rotate function.
I have checked many possibilities, and the very best in simplicity and unser experience I found is Kroppr at a very affordable €29/license.
The downside is, it comes with encrypted PHP code to bind the product to a subdomain. That is understandable, but while I'm perfectly happy to pay money for a tool as great as that, and ready to sign all sorts of legal agreements to protect the license, I am not ready to use encrypted PHP code, especially not from an outlet that doesn't even have a postal address on its web site.
Does anybody know an Open Source or commercial solution that comes close to Kroppr and ships with source, or allow for full customization and free definition of the server-side backend?
The features in detail:
Rectangular selection to crop image, slider or similar to zoom
Optionally: Rotating
"Accept" and "Reset" buttons, "accept" triggers a call to the server and submits the image
Full visual customizability (at least background and text colours)
Possibility to rename all controls
The server side technology would preferably be PHP.
http://deepliquid.com/content/Jcrop.html i love this one, every easy to use and tons of features. i know your searching a flash cropper but this question is tagged with js too so....
I found these three image utilities during my search:
Flex Image Cropping Component
HOW TO CROP AND RESIZE AN IMAGE USED AS BACKGROUND FOR CANVAS
Building an image-viewing widget with ActionScript 3.0
The first one is an open source flex component using an MIT license. The second one is a how to,with full source available. It doesn't have a sizable box, but it seems ok otherwise. The last one is also a how to article from adobe.com with source available.
Here is a list of good javascript based croppers:
Yahoo! UI ImageCropper
Jcrop
MooCrop
UvumiTools
PHP & jQuery Image Upload and Crop
Here is a list of action script based croppers:
Flex Image Cropping Component
Image Crop
http://www.adylevy.com/index.php/2009/07/22/multiple-files-uploader-with-preview-on-client-side/
OR
http://www.resize-before-upload.com/
...took a bit of searching =)
I would take a look at the free pixlr editor and their developers API : http://pixlr.com/wiki/developer
I've used RadActive's I-Load component before, with great success. The UI customisation options are a little limited, but as far as functionality goes, I'm pretty sure it meets all your requirements.
EDIT: You don't specify what server-side technology you're using (if any). I'm pretty sure I-Load is designed for ASP.NET - this may or may not be an issue for you.
This is also a nice once and its only $10.
http://www.shift8creative.com/projects/agile-uploader/index.html
Still doesn't have image rotation/cropping. I most definitely do plan to add that, but after checking out all the things I could find I still wasn't happy. I researched out all the particulars and just ended up building my own. You're welcome to use it if you like and haven't found something else by now. Keep checking the link, I'll update it to include the rotation and crop feature along with multiple image uploads.
Something like this?
http://matrixoft.infunity.com/agents/calvin/tmp/forPekka.html
I'm perfectly happy to pay money for a tool as great as that
To carry out the responsibility of posting the answer for stackoverflow users, here is part of the crop image code:
var tNewImage:BitmapData=new BitmapData(mouseX-vCropX,mouseY-vCropY,true,0);
iImg.getChildAt(0).x = vSize/2 -vCropX;
iImg.getChildAt(0).y = vSize/2 -vCropY;
tNewImage.draw(iImg);
Where iImg is the movieclip containing the image with the image center positioned at (0,0) , vSize is the image dimension, vCropX and vCropY is the top left cropping coordinate. The tNewImage BitmapData is used for constructing the new Cropped Bitmap image

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