minimap test: zoom and pan of the image

src/net/torvald/terrarum/blockstats/MinimapComposer.kt

@@ -0,0 +1,50 @@
+package net.torvald.terrarum.blockstats
+
+import com.badlogic.gdx.Gdx
+import com.badlogic.gdx.graphics.Pixmap
+import com.badlogic.gdx.graphics.Texture
+import net.torvald.terrarum.AppLoader
+import net.torvald.terrarum.gameworld.GameWorld
+
+object MinimapComposer {
+
+    // strategy: mosaic the textures, maximum texture size is 4 096.
+
+
+    private var world: GameWorld = GameWorld.makeNullWorld()
+
+    fun setWorld(world: GameWorld) {
+        try {
+            if (this.world != world) {
+                AppLoader.printdbg(this, "World change detected -- old world: ${this.world.hashCode()}, new world: ${world.hashCode()}")
+
+                // TODO, also set totalWidth/Height
+            }
+        }
+        catch (e: UninitializedPropertyAccessException) {
+            // new init, do nothing
+        }
+        finally {
+            this.world = world
+        }
+    }
+
+    val tempTex = Array(4) { Texture(1,1,Pixmap.Format.RGBA8888) }
+    // total size of the minimap. Remember: textures can be mosaic-ed to display full map.
+    var totalWidth = 0
+    var totalHeight = 0
+
+    init {
+        repeat(4) {
+            tempTex[it] = Texture(Gdx.files.internal("./assets/testimage.png"))
+        }
+        totalWidth = tempTex[0].width * 2
+        totalHeight = tempTex[0].height * 2
+    }
+
+    fun dispose() {
+        // tempTex.forEach { it.dispose }
+        // minimapPixmaps.forEach { it.dispose }
+    }
+
+}