MainActivity.kt
package com.cfsuman.kotlintutorials
import android.app.Activity
import android.graphics.*
import android.os.Bundle
import android.widget.ImageView
class MainActivity : Activity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
// get the widgets reference from XML layout
val imageView = findViewById<ImageView>(R.id.imageView)
// show path drawing on image view
imageView.setImageBitmap(drawPath())
}
}
// function to draw path on canvas
fun drawPath():Bitmap?{
val bitmap = Bitmap.createBitmap(
1500,
850,
Bitmap.Config.ARGB_8888
)
// canvas to draw path
val canvas = Canvas(bitmap).apply {
drawColor(Color.parseColor("#A2A2D0"))
}
// paint to draw path fill color
val paintFill = Paint().apply {
isAntiAlias = true
color = Color.parseColor("#333399")
style = Paint.Style.FILL
}
// create a path
val path = Path().apply {
fillType = Path.FillType.EVEN_ODD
// margin in pixels
val margin = 100
// pencil head will draw the path
// move pencil head to canvas top horizontal center
val topHorizontalCenter = Point(canvas.width/2, margin)
moveTo(topHorizontalCenter.x.toFloat(),
topHorizontalCenter.y.toFloat())
// move pencil head to canvas left vertical center
val leftVerticalCenter = Point(margin,canvas.height/2)
lineTo(leftVerticalCenter.x.toFloat(),
leftVerticalCenter.y.toFloat())
// move pencil head to canvas bottom horizontal center
val bottomHorizontalCenter = Point(canvas.width/2,
canvas.height - margin)
lineTo(bottomHorizontalCenter.x.toFloat(),
bottomHorizontalCenter.y.toFloat())
// move pencil head to canvas right vertical center
val rightVerticalCenter = Point(canvas.width
- margin, canvas.height/2)
lineTo(rightVerticalCenter.x.toFloat(),
rightVerticalCenter.y.toFloat())
close()
}
// finally, draw the path fill color on canvas
canvas.drawPath(path, paintFill)
// paint to draw path border
val paintStroke = Paint().apply {
isAntiAlias = true
color = Color.parseColor("#F0FFFF")
strokeWidth = 20F
style = Paint.Style.STROKE
strokeCap = Paint.Cap.ROUND
}
// draw path border on canvas
canvas.drawPath(path, paintStroke)
return bitmap
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/rootLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#DCDCDC"
android:padding="24dp">
<ImageView
android:id="@+id/imageView"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
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