painterro_revised

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Painterro is JavaScript paint widget which allows editing images directly in a browser.
It can be easily integrated into your website or blog by including only one js file and calling initialization code.

With Painterro you can:
- Paste image from clipboard with Ctrl+V (e.g. PtnScr screenshot), drag and drop it into widget, or load with open dialog
- Crop image by defined area
- Paint primitives (alpha color can be used)
- Add text
- Rotate / resize (scale) image
- Pixelize some area to hide sensitive data


!Painterro preview

Originally Painterro was designed for quick screenshots processing: You make screenshot by pressing PrtSc button,
then open Painterro on your website, paste an image with Ctrl+V,
crop it to interested area, highlight something with line/rectangle tool and/or add some text
to the image and save on server with custom save handler (e.g. simple XHR request to your backend).
In addition, you can use it for processing any kind of raster images. Please try a demo.
Also painterro has Wordpress Plugin.

If you want to see some feature in Painterro, please leave (or vote for) an issue here.
There is no promise that it will be implemented soon or ever, but it is interesting to know what features users want to have.

Painterro is written with vanilla JS to stay lightweight and minimalistic. Code
written on ES6 which transplited by Babel and packed to a single file using webpack.


Table of contents
=================

* Table of contents
* Installation
* With npm
* By including script
* Read after installation
* Supported hotkeys
* Configuration
* UI color scheme
* Translation
* Saving image
* Base64 saving
* Binary saving
* Saving to WYSIWYG
* Format and quality
* Development
* Building painterro
* Dev-server
* Regenerating icons font
* ToDo list


Installation
============


With npm
--------

If you have npm-based project you can run:
``bash
npm install painterro --save
`
Then in your code

`js
import Painterro from 'painterro'
...
Painterro().show()
`

By including script
-------------------

You can download latest painterro-*.min.js here https://github.com/ivictbor/painterro/releases/
or build it by yourself.

Then insert
`
Then in your code:
`html

`
See fiddle example


Read after installation
-----------------------

To be able to save edited images on server or client see Saving image. For configurations see Configuration

Supported hotkeys
=================

|||
|-|-|
| Ctrl + Z | Cancel last operation |
| Ctrl + V | Paste image from clipboard |
| Ctrl + C | Copy selected aria to clipboard (*internal keyboard) |
| Shift when drawing rect/ellipse | Draw square/circle |
| Shift when drawing line | draw at angles of 0, 45, 90, 135 etc degrees |
| Alt when using pipette | Hide zoom helper (colored grid) |
| Ctrl + Wheel mouse up/down | Zoom image |
| Ctrl + S | Save image |

Configuration
=============

You can pass parameters map to Painterro constructor:
`js
Painterro({
activeColor: '#00ff00', // default brush color is green
// ... other params here
})
`

| Param | Description | Default |
|-|-|-|
| id | If provided, then Painterro will be placed to some holder on page with this id, in other case holder-element will be created (fullscreen with margins) | undefined |
|activeColor| Line/Text color that selected by default | '#ff0000' |
|activeColorAlpha | Transparancy of activeColor from 0.0 to 1.0, 0.0 = transparent | 1 |
|activeFillColor | Fill color that selected by default | '#000000' |
|activeFillColorAlpha | Transparancy of activeColor from 0.0 to 1.0 | 0 |
|defaultLineWidth | Line width in px that selected by default | 5 |
|defaultEraserWidth | Eraser width in px that selected by default | 5 |
|backgroundFillColor | Default background color when image created/erased | "#ffffff" |
|backgroundFillColorAlpha| Transparancy of backgroundFillColor from 0.0 to 1.0 | 1.0 |
|textStrokeColor| Stroke color of text tool | "#ffffff" |
|textStrokeColorAlpha| Stroke color of text tool | 1.0 |
|defaultFontSize | Default font size in pixels | 24 |
|defaultSize | default image size, should be string in format x in pixel, e.g. '200x100'. If value is 'fill'(default) than all container size will be used | 'fill' |
|fontStrokeSize | default stroke width of text | 0 |
|defaultTool | Tool selected by default | 'select' |
|hiddenTools | List of tools that you wish to exclude from toolbar e.g. something from this list ['crop', 'line', 'arrow', 'rect', 'ellipse', 'brush', 'text', 'rotate', 'resize', 'save', 'open', 'close'], You can't hide default tool | [] |
|initText | Display some centered text before painting (supports HTML). If null, no text will be shown | null |
|initTextColor | Color of init text | '#808080' |
|initTextStyle | Style of init text | "26px 'Open Sans', sans-serif" |
|pixelizePixelSize | Default pixel size of pixelize tool. Can accept values - x - x pixels, x% - means percents of minimal area rectangle side | 20% |
|changeHandler | Function that will be called if something will be changed (painted, erased, resized, etc) | undefined |
|undoHandler | Function that will be called if user will undo (Ctrl+Z) | undefined |
|availableLineWidths | A list of the line width values that are available for selection in a drop down list e.g. [1,2,4,8,16,64]. Otherwise an input field is used. | undefined |
|availableArrowLengths | A list of the arrow sizes values that are available for selection in a drop down list e.g. [10,20,30,40,50,60]. Otherwise an input field is used. | 30 |
|availableEraserWidths | A list of the eraser width values that are available for selection in a drop down list e.g. [1,2,4,8,16,64]. Otherwise an input field is used. | undefined |
|availableFontSizes | A list of the font size values that are available for selection in a drop down list e.g. [1,2,4,8,16,64]. Otherwise an input field is used. | undefined |
|toolbarPosition | Whether to position the toolbar at the top or bottom. | 'bottom' |
|fixMobilePageReloader | By default painterro adds overflow-y: hidden to page body on mobile devices to prevent "super smart" feature lice Chrom's reload page. Unfortunately we can't prevent it by preventDefault. If your want to scroll page when painterro is open, set this to false | true |
|language | Language of the widget. |'en'|
|how_to_paste_actions| List of paste options that will be suggested on paste using some paste dialog e.g. ['extend_right', 'extend_down'] . If there is only one option in list, then it will choosing automatically without dialog| ['replace_all', 'paste_over', 'extend_right', 'extend_down'] |

UI color scheme
---------------

Next group of params used to configure painterro user interface.
They should be placed under colorScheme group, for example:
`js
Painterro({
colorScheme: {
main: '#fdf6b8', // make panels light-yellow
control: '#FECF67' // change controls color
}
}).show()
`

| Param | Description | Default |
|-|-|-|
|main | Color of panels, take most of UI space | '#dbebff' |
|control | Color of controls background (e.g. button background) | "#abc6ff" |
|controlContent | Content of controls (e.g. button text) | '#000000' |
|activeControl | Color for control when it active (e.g. button pressed) | '#7485B1' |
|activeControlContent | Color for activated control content | main |
|inputBorderColor | You can add border to inputs, by default color is same as main so borders will not be seen | main |
|inputBackground | Background of inputs | '#ffffff' |
|inputText | Color of text in input | activeControl |
|backgroundColor| Background color of component area which left outside of image due to it size/ratio | '#999999' |
|dragOverBarColor| Color of bar when dropping file to painterro | '#899dff' |
|hoverControl| Controls color when mouse hovered | control |
|hoverControlContent| Controls background color when mouse hovered | '#1a3d67' |
|toolControlNameColor| Color of toolbar labels that prepend controls | rgba(255,255,255,0.7) |


API
-------

.show(openImage) - Shows painterro instance. openImage can have next values:

* false - will open image that already was drawn before last close
* some string value, e.g. 'http://placehold.it/120x120&text=image1' - will try to load image from url
* all another values - will clear content before open

.hide() - hide instance

.save() - call save (same save as on buttons bar). Can be used if save button is hidden (hiddenTools: ['save'])

Example:

`js
var p = Painterro()
p.show()
`

Translation
-----------

Want to translate Painterro into your language?
If you need English, Spanish or Catalan language,
you should pass language parameter, for example:

`js
Painterro({
language: 'es'
}).show()
`
language can have next values:
* en - for using English language
* es - for using Spanish language
* ca - for using Catalan language

If you want to add another language, then fork. Create file in folder langs for your translation and copy [langs/en.lang.js] in it. Then translate all 'Strings' and add reference in [js/translation.js]. After that create pull-request, or just open issue
if you don't know how to create a PR.

If you want to translate or change strings without contributing you can do this by passing
translation parameter, for example:

`js
Painterro({
translation: {
name: 'ua',
strings: {
apply: 'Застосувати'
// other strings
}
}
}).show()
`
For all strings that can be translated, see [langs/en.lang.js]


Saving image
============

You should provide your save handler, which will post/update image on server or will pass image to another
frontend components.


Binary saving
-------------

You can post data with binary multipart/form-data request which is the most efficient way to pass data to backend. Example uses raw XMLHttpRequest. Of course,
you can use fetch, jQuery, etc insead.

`js
var ptro = Painterro({
saveHandler: function (image, done) {
var formData = new FormData();
formData.append('image', image.asBlob());
// you can also pass suggested filename
// formData.append('image', image.asBlob(), image.suggestedFileName());
var xhr = new XMLHttpRequest();
xhr.open('POST', 'http://127.0.0.1:5000/save-as-binary/', true);
xhr.onload = xhr.onerror = function () {
done(true);
};
xhr.send(formData);
}
})
ptro.show();
`
Here is python flask backend example (of course same can be implemented using any technology):
`python
@app.route("/save-as-binary/", methods=['POST'])
def binary_saver():
filename = '{:10d}.png'.format(int(time())) # generate some filename
filepath = os.path.join(get_tmp_dir(), filename)
request.files['image'].save(filepath)
return jsonify({})
`

See full example in example directory. You can run it used python3 with installed Flask (pip install flask).

Base64 saving
-------------


You can also same image by posting base64 string via plain POST json call.
Please note that base64 encoding is less efficient then binary data, for example some 1920 x 1080 image took 402398 bytes for base64 upload.
The same image took 301949 bytes with multipart/form-data.


`js
var ptro = Painterro({
saveHandler: function (image, done) {
// of course, instead of raw XHR you can use fetch, jQuery, etc
var xhr = new XMLHttpRequest();
xhr.open("POST", "http://127.0.0.1:5000/save-as-base64/");
xhr.setRequestHeader("Content-Type", "application/json");
xhr.send(JSON.stringify({
image: image.asDataURL()
}));
xhr.onload = function (e) {
// after saving is done, call done callback
done(true); //done(true) will hide painterro, done(false) will leave opened
}
},
activeColor: '#00b400' // change active color to green
});
ptro.show();
`
Backend should convert base64 to binary and save file:
`python
@app.route("/save-as-base64/", methods=['POST'])
def base64_saver():
filename = '{:10d}.png'.format(int(time())) # generate some filename
filepath = os.path.join(get_tmp_dir(), filename)
with open(filepath, "wb") as fh:
base64_data = request.json['image'].replace('data:image/png;base64,', '')
fh.write(base64.b64decode(base64_data))
return jsonify({})
`


Saving to WYSIWYG
-----------------

You can just insert image as data url to any WYSIWYG editor, e.g. TinyMCE:
`js
tinymce.init({ selector:'textarea', });
var ptro = Painterro({
saveHandler: function (image, done) {
tinymce.activeEditor.execCommand('mceInsertContent', false, '');
done(true)
}
})
`

Format and quality
------------------

When you call image.asDataURL() or image.asBlob(), you can also specify image mime type (format), e.g.
image.asDataURL('image/jpeg'). Default type is 'image/png'.
If type is image/jpeg or image/webp, you can also define image quality from 0.0 to 1.0, default is 0.92,
example: image.asDataURL('image/jpeg', 0.5)



Development
===========

After pulling repo install node modules:
`bash
cd painterro
npm install
`

Building painterro
------------------

`bash
npm run build
`

Result file for