如何在kotlin中使用图形2d与paint()

我想开始制作一个2d视频游戏,我找到了一个java教程。然而,我想使用kotlin,因为我听说它更好,我是java和kotlin编程的新手,我需要把这个

Graphics2d g2 = Graphics2D(g)

在科特林,我无论如何都没有通过搜索找到。

如果你想知道(但我认为这无关紧要)JPanel类文件在这里:

import java.awt.Color
import java.awt.Dimension
import java.awt.Graphics
import java.awt.Graphics2D
import javax.swing.JPanel


class GamePanel : JPanel(), Runnable{
    //Screen settings
    var originalTileSize = 16
    var scale = 3
    var tileSize = originalTileSize * scale
    var maxScreenCol = 16
    var maxScreenRow = 12
    var gameThread = Thread()
    var screenWidth = maxScreenCol * tileSize // 768
    var screenHeight = maxScreenRow * tileSize // 576 TO CHANGE????

    init {
        this.setPreferredSize(Dimension(screenWidth, screenHeight))
        this.setBackground(Color.BLACK)
        this.setDoubleBuffered(true)
    }

    // Game Thread code
    public fun startGameThread(){
        gameThread = Thread(this)
        gameThread.start()
    }

    // run the game loop
    public override fun run(){
        while (gameThread != null){
            update()
            repaint()
        }
    }

    public fun update(){
        // Nothing for now
    }

    public override fun paintComponent(g : Graphics) {
        super.paintComponent(g)
        Graphics2D g2 = Graphics2D(g)
    }
}