fixed a bug where colourmap won't interpolate properly. BUG: fadeout/fadein is somewhat glitched, UIQuickBar does not fade-in/out instead it just (dis)appears with no effect

Former-commit-id: 029f504b7e2e4d85676ec8b36b27dcbed5e5db47
Former-commit-id: 0b56ca1e8976bfc5e7ea8d665e6ed6496a52de85

src/net/torvald/colourutil/ColourTemp.kt

@@ -0,0 +1,18 @@
+package net.torvald.colourutil
+
+import org.newdawn.slick.Color
+import org.newdawn.slick.Image
+
+/**
+ * Created by minjaesong on 16-07-26.
+ */
+object ColourTemp {
+    private var envOverlayColourmap = Image("./res/graphics/colourmap/black_body_col_1000_40000_K.png")
+
+    private fun colTempToImagePos(K: Int): Int {
+        if (K < 1000 || K >= 40000) throw IllegalArgumentException("K: out of range. ($K)")
+        return (K - 1000) / 10
+    }
+
+    operator fun invoke(temp: Int): Color = envOverlayColourmap.getColor(colTempToImagePos(temp), 0)
+}

src/net/torvald/colourutil/ColourUtil.kt

@@ -0,0 +1,10 @@
+package net.torvald.colourutil
+
+import org.newdawn.slick.Color
+
+/**
+ * Created by minjaesong on 16-07-26.
+ */
+object ColourUtil {
+    fun toSlickColor(r: Int, g: Int, b: Int) = Color(r.shl(16) or g.shl(8) or b)
+}