WTDrawingAndroid

A simple way to draw smooth line on Android.

Screenshot

Features

Change stroke color
Change stroke width
Undo
Clear all drawings
Eraser drawing
Get final bitmap

Usage

In Android Studio, just import module wtdrawing. In other IDE, you should copy WTBezierPath.java and WTDrawingView.java into your project.

Init in layout

<com.water.wtdrawing.WTDrawingView
       android:id="@+id/wtDrawingView"
       android:layout_width="match_parent"
       android:layout_height="match_parent"/>

Note: layout_width and layout_height can not be wrap_content.

Init with Java code

int width = width you want;
int height = height you want;
WTDrawingView wtDrawingView = new WTDrawingView(context,width,height);

Then add WTDrawingView instance to your view group.

Undo

wtDrawingView.undo();

Clear all drawings

wtDrawingView.clear();

Draw eraser

wtDrawingView.setEraserMode(true);

Change stroke width

wtDrawingView.setStrokeWidth(5.0f); // 5.0f is a dp value.

Default stroke width is 2.0(dp).

Change stroke color

wtDrawingView.setStrokeColor(Color.RED);

Default stroke color is black.

Change eraser stroke width

wtDrawingView.setEraserWidth(20.0f); // 20.0f is a dp value.

Default eraser width is 20(dp).

Get bitmap

int backgroundColor = Color.WHITE;
Bitmap bitmap = wtDrawingView.getBitmap(backgroundColor);

Changelog

1.0.1

add getBitmap method to retrieve final bitmap
Use dirty rect to improve drawing performance

waterzhang0423 / WTDrawingAndroid