PolygonDrawingUtil
A compact Android utility for constructing and drawing rounded regular polygons.
Consumers can specify:
- number of sides (≥ 3);
- center coordinates;
- outer radius (center to vertex);
- corner rounding radius;
- polygon rotation;
- (optional) fill/stroke
Paint
; - (optional) target
Path
instance.
Demo
This video was captured using the sample application in this repository. It provides convenient controls for exploring PolygonDrawingUtil
's capabilities.
Getting Started
-
Specify PolygonDrawingUtil as a dependency in your
build.gradle
file:dependencies { implementation "com.stkent:polygondrawingutil:1.2.0" }
-
Create a new
PolygonDrawingUtil
instance and assign it to a property in your custom view class:private val polygonDrawingUtil = PolygonDrawingUtil()
-
Call
polygonDrawUtil.drawPolygon
in youronDraw
method:override fun onDraw(canvas: Canvas) { super.onDraw(canvas) polygonDrawingUtil.drawPolygon( canvas, numberOfSides, centerX, centerY, polygonRadius, cornerRadius, rotation, polygonPaint ) }
Alternately, you can supply your own
Path
instance and askPolygonDrawingUtil
to fill it with a polygon:private val myPath = Path() polygonDrawingUtil.constructPolygonPath( myPath, numberOfSides, centerX, centerY, polygonRadius, cornerRadius, rotation )
This allows you to perform post-processing on the
Path
before drawing to aCanvas
.
License
Copyright 2019 Stuart Kent
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.