DrawingCanvas

Library for drawing app canvas with features like undo redo, color & transperency change, Integrated into your app easily.

Look at it's working demo on Playstore.

Features

• Size , transperancy and color manipulation of brush -- Using setSizeForBrush(), setBrushAlpha() and setBrushColor() respectively
• Undo and Redo fucntionality available -- Using undo() and redo() respectively
• Using erase() function to match the background color to the brush color
• Clear canvas feature -- Using clearDrawingBoard()
• Getter methods to get the current values of the attribute and also the drawing itself.

Demo

Watch the explaination on youtube: https://www.youtube.com/watch?v=Dnm3SI_OIko

DrawingApp.demo1.mp4

How to use

You can refer to this Video:

https://youtu.be/Dnm3SI_OIko

OR Follow these steps:

Step 1. Add this maven dependency to your build.gradle (project) file / settings.gradle for new version

allprojects {
		repositories {
			...
			maven { url 'https://jitpack.io' }
		}
	}

Step 2. Add the dependency to your build.gradle (app) file

dependencies {
           implementation 'com.github.Miihir79:DrawingCanvas:1.1.2'
   }

Step 3. Add the XML code

<com.mihir.drawingcanvas.drawingView
      android:id="@+id/drawing_view"
      android:layout_width="match_parent"
      android:layout_height="match_parent">

  </com.mihir.drawingcanvas.drawingView>

Step 4. Refrence the canvas in XML to use it's functions

    drawing_view.setBrushAlpha(120)// values from 0-255
    drawing_view.setBrushColor(R.color.white) 
    drawing_view.setSizeForBrush(12) // takes value from 0-200
    drawing_view.undo() 
    drawing_view.redo()
    drawing_view.erase(Color.WHITE) // give the color same as the background color
    drawing_view.clearDrawingBoard()
    
    //getter methods
    val alpha = drawing_view.getBrushAlpha() // returns INT
    val brushSize = drawing_view.getBrushSize() // returns INT
    val brushColor = drawing_view.getBrushColor() // returns INT
    
    val drawing = drawing_view.getDrawing() // returns ArrayList<CustomPath>(); where CustomPath(var color:Int , var brushThickness:Int, var alpha:Int)
        

Functions

Explanation	Parameter Name	Type	Values
Set Brush Color	setBrushColor()	color	any color
Set Brush Alpha	setBrushAlpha()	Int	0-255
Set Brush Size	setSizeForBrush()	Int	0-200
Set eraser color	erase()	color	any color

Demo of all the functions

setBrushAlpha

This function takes the value from 0-255. You can check it's implementation here:

setBrushColor

This function takes any color as an input. You can check it's implementation here:

Link for the color picker: https://github.com/Dhaval2404/ColorPicker

setSizeForBrush

This function takes any value from 0-200 as an input. You can check it's implementation here:

undo and redo

These functions can undo and redo your strokes. You can check it's implementation here:

clearDrawingBoard

This function clears all the strokes and clear the drawing board. But carefully you wont be able to undo this change! You can check it's implementation here:

getBrushAlpha

This functions returns Integer value of alpha of the brush which will be in the range of 0-255.

getBrushSize

This function returns Integer value of the size or thickness of the brush.

getBrushColor

This function returns Integer value of the color of the brush.

getDrawing

This function returns an entire arraylist of customPath where CustomPath(var color:Int , var brushThickness:Int, var alpha:Int). Here color is the brush color , brushThickness is the width or the size of the brush and alpha is the transperancy. This is useful to store the entire drawing in high resolution or to share it.

That's it!

If you liked it then show some love by giving a star.

Author and contributions:

Mihir Shah has made this library and will maintain it.

All contributions are welcomed!