Initial implementation

1 files changed, 31 insertions, 0 deletions

diff --git a/src/main/kotlin/Renderer.kt b/src/main/kotlin/Renderer.kt
new file mode 100644
index 0000000..b266e61
--- /dev/null
+++ b/src/main/kotlin/Renderer.kt
@@ -0,0 +1,31 @@
+import kotlinx.browser.document
+import org.w3c.dom.CanvasRenderingContext2D
+import org.w3c.dom.HTMLCanvasElement
+
+class Renderer(val w: Int, val h: Int) {
+
+  private val canvas = (document.createElement("canvas") as HTMLCanvasElement)
+    .apply {
+      width = w
+      height = h
+    }
+  private val context = canvas.getContext("2d") as CanvasRenderingContext2D
+
+  init {
+    document.body!!.appendChild(canvas)
+  }
+
+  fun drawLine(startX: Int, startY: Int, endX: Int, endY: Int, cssColour: String = "#FF0000") {
+    context.strokeStyle = cssColour
+    context.lineWidth = 4.0
+    context.beginPath()
+    context.moveTo(startX.toDouble(), startY.toDouble())
+    context.lineTo(endX.toDouble(), endY.toDouble())
+    context.stroke()
+  }
+
+  fun clear() {
+    context.clearRect(0.0, 0.0, w.toDouble(), h.toDouble())
+  }
+
+}
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