From ae838b397b6e5ca85d30fe1a8b9ccbb74864a7a6 Mon Sep 17 00:00:00 2001
From: John Firebaugh <john.firebaugh@gmail.com>
Date: Fri, 8 Jul 2016 16:23:13 -0700
Subject: [core] Move translatedMatrix to RenderTile

---
 src/mbgl/renderer/render_tile.cpp | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

(limited to 'src/mbgl/renderer/render_tile.cpp')

diff --git a/src/mbgl/renderer/render_tile.cpp b/src/mbgl/renderer/render_tile.cpp
index 513515ddf0..5c7c491be0 100644
--- a/src/mbgl/renderer/render_tile.cpp
+++ b/src/mbgl/renderer/render_tile.cpp
@@ -1,5 +1,34 @@
 #include <mbgl/renderer/render_tile.hpp>
+#include <mbgl/map/transform_state.hpp>
 
 namespace mbgl {
 
+using namespace style;
+
+mat4 RenderTile::translatedMatrix(const std::array<float, 2>& translation,
+                                  TranslateAnchorType anchor,
+                                  const TransformState& state) const {
+    if (translation[0] == 0 && translation[1] == 0) {
+        return matrix;
+    }
+
+    mat4 vtxMatrix;
+
+    if (anchor == TranslateAnchorType::Viewport) {
+        const double sin_a = std::sin(-state.getAngle());
+        const double cos_a = std::cos(-state.getAngle());
+        matrix::translate(vtxMatrix, matrix,
+                id.pixelsToTileUnits(translation[0] * cos_a - translation[1] * sin_a, state.getZoom()),
+                id.pixelsToTileUnits(translation[0] * sin_a + translation[1] * cos_a, state.getZoom()),
+                0);
+    } else {
+        matrix::translate(vtxMatrix, matrix,
+                id.pixelsToTileUnits(translation[0], state.getZoom()),
+                id.pixelsToTileUnits(translation[1], state.getZoom()),
+                0);
+    }
+
+    return vtxMatrix;
+}
+
 } // namespace mbgl
-- 
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