Add north arrow for rotating map

Render.java

@@ -167,16 +167,6 @@ public static void drawTexturedRect(double x, double y, double w, double h, doub
 		}
 	}
 
-	// note that the coords must be in the correct sequence, following the perimeter of the quad,
-	// and in anticlockwise order.
-	// otherwise one or both of the triangles that make the quad will not be rendered.
-	//  1 +------+ 4      2 +------+ 1     1 +------+ 2
-	//    |      |          |      |         |      |
-	//    |      |          |      |         |      |
-	//  2 +------+ 3      3 +------+ 4     3 +------+ 4
-	//     works             works            fails
-	//
-
 	public static void drawArrow(double x, double y, double angle, double length) {
 		// angle the back corners will be drawn at relative to the pointing angle
 		double arrowBackAngle = 0.75D * Math.PI;
@@ -194,6 +184,20 @@ public static void drawArrow(double x, double y, double angle, double length) {
         GL11.glDisable(GL11.GL_BLEND);
 	}
 
+	public static void drawTriangle(double x1, double y1, double x2, double y2, double x3, double y3) {
+        GL11.glEnable(GL11.GL_BLEND);
+        GL11.glDisable(GL11.GL_TEXTURE_2D);
+        GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
+        Tessellator tes = Tessellator.instance;
+        tes.startDrawing(GL11.GL_TRIANGLES);
+        tes.addVertex(x1, y1, zDepth);
+        tes.addVertex(x2, y2, zDepth);
+        tes.addVertex(x3, y3, zDepth);
+        tes.draw();
+        GL11.glEnable(GL11.GL_TEXTURE_2D);
+        GL11.glDisable(GL11.GL_BLEND);
+	}
+
 	public static void drawRect(double x, double y, double w, double h) {
 		GL11.glEnable(GL11.GL_BLEND);
         GL11.glDisable(GL11.GL_TEXTURE_2D);

map/MapRenderer.java

@@ -104,7 +104,14 @@ public void draw() {
 		// draw player arrow
 		Render.setColour(this.mapMode.playerArrowColour);
 		Render.drawArrow(arrow.x, arrow.y, this.mw.playerHeading, this.mapMode.playerArrowSize);
-
+
+		// draw north arrow
+		if (this.mapMode.rotate) {
+			Render.setColour(this.mapMode.borderColour);
+			double r = this.mapMode.h / 2.0;
+			Render.drawTriangle(4.0, -r, 0.0, -r - 4.0, -4.0, -r);
+		}
+
 		// draw overlays from registered providers
    	 	//for (IMwDataProvider provider : MwAPI.getDataProviders())
 		IMwDataProvider provider = MwAPI.getCurrentDataProvider();