core-javafx-canvas.kt

// package <...>

import javafx.animation.AnimationTimer
import javafx.application.Application
import javafx.scene.Group
import javafx.scene.Scene
import javafx.scene.canvas.Canvas
import javafx.scene.canvas.GraphicsContext
import javafx.scene.paint.Color
import javafx.stage.Stage

val GraphicsContext.width
    get() = canvas.width

val GraphicsContext.height
    get() = canvas.height

class ApplicationFx : Application() {
    override fun start(primaryStage: Stage) {
        primaryStage.apply {
            title = "<Untitled>"
            isResizable = true

            val canvas = Canvas()
            val root = Group(canvas)

            scene = Scene(root, 600.0, 450.0)

            canvas.widthProperty().bind(scene.widthProperty())
            canvas.heightProperty().bind(scene.heightProperty())

            minWidth = 400.0
            minHeight = 300.0

            val at = object : AnimationTimer() {
                override fun handle(now: Long) {
                    render(canvas.graphicsContext2D)
                }
            }

            show()
            at.start()
        }
    }

    fun render(g: GraphicsContext) {
        g.clearRect(0.0, 0.0, g.width, g.height)

        g.fill = Color.THISTLE
        g.fillRect(g.width / 2 - 50, g.height / 2 - 50, 100.0, 100.0)
    }
}

fun main(args: Array<String>) {
    Application.launch(ApplicationFx::class.java, *args)
}

LICENSE

MIT License

Copyright (c) 2017 Antonio De Lucreziis

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.