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 drawing on image view
imageView.setImageBitmap(drawLines())
}
}
// function to draw lines on canvas
fun drawLines():Bitmap?{
val bitmap = Bitmap.createBitmap(
1500,
850,
Bitmap.Config.ARGB_8888
)
val canvas = Canvas(bitmap).apply {
drawColor(Color.parseColor("#A2A2D0"))
}
val paint = Paint().apply {
color = Color.parseColor("#333399")
strokeWidth = 25F
style = Paint.Style.STROKE
strokeCap = Paint.Cap.SQUARE
strokeMiter = 20F
}
// list to hold lines xy positions
val list = mutableListOf<Float>()
// first line starting point x y
list.add(50F) // x
list.add(50F) // y
// first line ending point x y
list.add(canvas.width / 2F - 200)
list.add(canvas.height / 2F)
// second line starting x y
list.add(canvas.width / 2F - 200)
list.add(canvas.height / 2F)
// second line ending point x y
list.add(50F)
list.add(canvas.height - 50F)
// third line starting point x y
list.add(canvas.width - 50F)
list.add(50F)
// third line ending point x y
list.add(canvas.width / 2f + 200)
list.add(canvas.height / 2F)
// fourth line starting point x y
list.add(canvas.width / 2f + 200)
list.add(canvas.height / 2F)
// fourth line ending point x y
list.add(canvas.width - 50F)
list.add(canvas.height - 50F)
// finally, draw lines on canvas
canvas.drawLines(
list.toFloatArray(), paint
)
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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