waterzhang0423 / wtdrawingandroid

A simple way to draw smooth line on Android.

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