Add dev demo

Author: alshan

demo/jvm-batik/src/main/kotlin/frontendContextDemo/scripts/Issue_xlim_breaks_datetime_LP1348.kt

@@ -0,0 +1,63 @@
+package frontendContextDemo.scripts
+
+import frontendContextDemo.ScriptInBatikContext
+import org.jetbrains.letsPlot.geom.geomLine
+import org.jetbrains.letsPlot.letsPlot
+import org.jetbrains.letsPlot.scale.xlim
+import java.time.Instant
+import java.time.ZoneId
+import java.time.ZonedDateTime
+import kotlin.math.cos
+import kotlin.math.sin
+
+@Suppress("ClassName")
+object Issue_xlim_breaks_datetime_LP1348 {
+    @JvmStatic
+    fun main(args: Array<String>) {
+        ScriptInBatikContext.eval("Issue: xlim breaks datetime LP-1348") {
+
+            fun squiggle(x: Double): Double {
+                return sin(3 * x) / (x * (cos(x) + 2))
+            }
+
+            val N = 50
+            val xs = (0 until N).map { i -> 1.0 + (25.0 - 1.0) * i / (N - 1) }
+            val ys = xs.map { squiggle(it) }
+
+            // Berlin DST transition: March 30, 2025 at 2:00 AM
+            // Cover ±3 days: March 27 - April 2, 2025 (6 days total)
+
+            // Generate equally spaced UNIX timestamps (in seconds)
+
+            val startTimestamp = ZonedDateTime.of(2025, 3, 27, 0, 0, 0, 0, ZoneId.of("UTC")).toEpochSecond()
+            val endTimestamp = ZonedDateTime.of(2025, 4, 2, 23, 59, 0, 0, ZoneId.of("UTC")).toEpochSecond()
+            val unixTimestamps = (0 until N).map { i ->
+                startTimestamp + (endTimestamp - startTimestamp) * i / (N - 1)
+            }
+
+            // Convert to ZonedDateTime with Berlin timezone
+            val xsDatetime = unixTimestamps.map { timestamp ->
+                Instant.ofEpochSecond(timestamp).atZone(ZoneId.of("Europe/Berlin"))
+            }
+
+            val data = mapOf(
+                "xs" to xsDatetime,
+                "ys" to ys
+            )
+
+            val p = letsPlot(data = data) { x = "xs"; y = "ys" } +
+                    geomLine(
+                        color = "#1380A1",
+                        size = 2
+//                    )
+                    ) +
+                    xlim(
+                        ZonedDateTime.of(2025, 3, 29, 23, 0, 0, 0, ZoneId.of("Europe/Berlin")) to
+                                ZonedDateTime.of(2025, 3, 30, 8, 0, 0, 0, ZoneId.of("Europe/Berlin")),
+                    )
+
+            p.show()
+
+        }
+    }
+}