Initial implementation

1 files changed, 57 insertions, 0 deletions

diff --git a/src/main/kotlin/Minimap.kt b/src/main/kotlin/Minimap.kt
new file mode 100644
index 0000000..dc7cc91
--- /dev/null
+++ b/src/main/kotlin/Minimap.kt
@@ -0,0 +1,57 @@
+import kotlinx.browser.document
+import org.w3c.dom.CanvasRenderingContext2D
+import org.w3c.dom.HTMLCanvasElement
+
+class Minimap(private val map: List<List<Int>>) {
+
+  private val scale = 30
+  private val mapWidth = map[0].size
+  private val mapHeight = map.size
+
+  private val canvas = (document.createElement("canvas") as HTMLCanvasElement)
+    .apply {
+      width = mapWidth * scale
+      height = mapHeight * scale
+      id = "minimap"
+      style.width = "${width}px"
+      style.height = "${height}px"
+    }
+  private val context = canvas.getContext("2d") as CanvasRenderingContext2D
+
+  init {
+    document.body!!.appendChild(canvas)
+  }
+
+  private fun drawMap() {
+    for (y in 0 until mapHeight) {
+      for (x in 0 until mapWidth) {
+        val wall = map[y][x]
+        if (wall > 0) {
+          context.fillStyle = "#000000"
+          context.fillRect((x * scale).toDouble(), (y * scale).toDouble(), scale.toDouble(), scale.toDouble())
+        }
+      }
+    }
+  }
+
+  fun update(camera: Camera) {
+    context.clearRect(0.0, 0.0, (mapWidth * scale).toDouble(), (mapHeight * scale).toDouble())
+    drawMap()
+    context.fillStyle = "#FF0000"
+    context.fillRect(camera.xPos * scale, camera.yPos * scale, scale.toDouble(), scale.toDouble())
+
+    context.strokeStyle = "#00FF00"
+    context.lineWidth = 2.0
+    context.beginPath()
+    context.moveTo(camera.xPos * scale, camera.yPos * scale)
+
+    val cameraCos = kotlin.math.cos(toRadians(camera.rotation)) * 4
+    val cameraSin = kotlin.math.sin(toRadians(camera.rotation)) * 4
+
+    val dirX = camera.xPos + cameraCos
+    val dirY = camera.yPos + cameraSin
+
+    context.lineTo(dirX * scale, dirY * scale)
+    context.stroke()
+  }
+}
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