MainActivity.kt
package com.cfsuman.kotlintutorials
import android.app.Activity
import android.graphics.*
import android.os.Bundle
import android.text.TextPaint
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)
// draw rotated text on canvas
imageView.setImageBitmap(drawTextRotate())
}
}
// function to draw text rotate on canvas
fun drawTextRotate():Bitmap?{
val bitmap = Bitmap.createBitmap(
1500,
850,
Bitmap.Config.ARGB_8888
)
// canvas to draw text
val canvas = Canvas(bitmap).apply {
drawColor(Color.parseColor("#A2A2D0"))
}
// text paint to draw text
val paint = TextPaint().apply {
isAntiAlias = true
textSize = 80F
color = Color.parseColor("#333399")
typeface = Typeface.DEFAULT_BOLD
textAlign = Paint.Align.CENTER
}
// text margin
val margin = 50F
// rotate canvas 90 degrees
canvas.save()
canvas.rotate(90F)
canvas.drawText(
"Angle 90 degrees",
canvas.height / 2F,
- margin,
paint
)
// save canvas before restore
canvas.restore() // restore canvas
canvas. save()
// change text color
paint.apply {
color = Color.parseColor("#333399")
}
// rotate canvas -90 degrees
canvas.rotate(-90F)
canvas.drawText(
"Angle -90 degrees",
-canvas.height / 2F,
canvas.width - margin,
paint
)
canvas.restore() // restore canvas
canvas.save() // save canvas state
// change text color
paint.apply {
color = Color.parseColor("#333399")
}
// draw text with no angle
canvas.drawText(
"Normal Text",
canvas.width / 2F,
canvas.height / 2F,
paint
)
canvas.save()
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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