1 files changed, 27 insertions, 0 deletions
diff --git a/vfd-dashboard/src/main/scala/vfd/dashboard/ui/instruments/Balance.scala b/vfd-dashboard/src/main/scala/vfd/dashboard/ui/instruments/Balance.scala
new file mode 100644
index 0000000..ef5a3cc
--- /dev/null
+++ b/vfd-dashboard/src/main/scala/vfd/dashboard/ui/instruments/Balance.scala
@@ -0,0 +1,27 @@
+package vfd.dashboard.ui.instruments
+
+import org.scalajs.dom.html
+import vfd.dashboard.Environment
+
+class Balance(implicit env: Environment) extends SvgInstrument[(Double, Double, Double, Double)] {
+  import SvgInstrument._
+  
+  val initial = (0.0, 0.0, 0.0, 0.0)
+  
+  lazy val element = svgObject("balance")
+  lazy val position = part("position")
+  lazy val moveable = Seq(position)
+  
+  protected def update(value: (Double, Double, Double, Double)) = {
+    val m0 = value._1
+    val m1 = value._2
+    val m2 = value._3
+    val m3 = value._4
+    val s = m0 + m1 + m2 + m3
+    val i = (m0 - m2) / s
+    val j = (m1 - m3) / s
+    val x = 0.5 * (i - j)
+    val y = 0.5 * (-i - j)
+    translate(position, (x * 50).toInt, (y * 50).toInt)
+  }
+}
+\ No newline at end of file