问题描述
使用 Skiko 和 Kotlin,我想制作一个基本动画:一个 0 到 100 的计数器,每秒自动更新文本。 我设法做到了,但它有一个问题,每次重新绘制窗口时它都会闪烁。 代码如下:
import kotlinx.coroutines.*
import org.jetbrains.skija.*
import org.jetbrains.skiko.*
import javax.swing.*
public fun main() {
val window = SkiaWindow().apply {
layer.renderer = CounterRenderer()
setSize(400,175)
isVisible = true
defaultCloSEOperation = WindowConstants.EXIT_ON_CLOSE
}
GlobalScope.launch {
for (i in 0..100) {
delay(1000)
window.layer.repaint()
}
}
}
public class CounterRenderer : SkiaRenderer {
private lateinit var canvas: Canvas
private var counter = 0
override fun onInit() {
}
override fun ondispose() {
}
override fun onReshape(width: Int,height: Int) {
}
override fun onRender(canvas: Canvas,width: Int,height: Int) {
this.canvas = canvas
val typeface = Typeface.makeFromName("Roboto",FontStyle.norMAL)
val fontSize = 30F
val font = Font(typeface,fontSize)
val paint = Paint().setColor(0XFF000000.toInt())
canvas.drawString("Counter: ${counter++}",10F,50F,font,paint)
}
}
我曾尝试使用skija 或skiko 搜索动画示例,但没有成功。 如果您能给我一些例子,我将不胜感激。
解决方法
在浏览 Android Compose 代码后,尤其是这个类: ComposeLayer。 我终于可以使用此代码了:
import kotlinx.coroutines.*
import org.jetbrains.skija.*
import org.jetbrains.skiko.*
import javax.swing.*
public fun main() {
val window = SkiaWindow().apply {
layer.renderer = CounterRenderer()
setSize(400,175)
isVisible = true
defaultCloseOperation = WindowConstants.EXIT_ON_CLOSE
}
GlobalScope.launch(Dispatchers.Main) {
for (i in 0..100) {
delay(500)
window.layer.redrawLayer()
}
}
}
public class CounterRenderer : SkiaRenderer {
private var counter = 0
private val typeface = Typeface.makeFromName("Roboto",FontStyle.NORMAL)
private val fontSize = 30F
private val font = Font(typeface,fontSize)
private val paint = Paint().setColor(0XFF000000.toInt())
override fun onInit() {
}
override fun onDispose() {
}
override fun onReshape(width: Int,height: Int) {
}
override fun onRender(canvas: Canvas,width: Int,height: Int) {
canvas.drawString("Counter: ${counter++}",10F,50F,font,paint)
}
}
要运行此代码,您需要安装特定的 Main Dispatcher,在本例中是通过将其添加到 gradle 配置中:
implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.9")
implementation("org.jetbrains.kotlinx:kotlinx-coroutines-swing:1.3.9")