overloaded function GetDiffOfTwoCameras

Change-Id: Ic195c846364ddf9c798d019eed23c27200713017
Reviewed-on: https://gerrit.libreoffice.org/11589Reviewed-by: Kohei Yoshida <libreoffice@kohei.us>
Tested-by: Kohei Yoshida <libreoffice@kohei.us>

chart2/source/view/inc/GL3DRenderer.hxx

@@ -220,6 +220,10 @@ public:
     glm::mat4 GetProjectionMatrix();
     glm::mat4 GetViewMatrix();
     glm::mat4 GetGlobalScaleMatrix();
+    glm::mat4 GetDiffOfTwoCameras(const glm::vec3& rBeginPos, const glm::vec3& rEndPos, const glm::vec3& rBeginDirection, const glm::vec3& rEndDirection);
+    glm::mat4 GetDiffOfTwoCameras(const glm::vec3& rEndPos, const glm::vec3& rEndDirection);
+    void AddMatrixDiff(const glm::mat4& aMat);
+    void ResetMatrixDiff();
 private:
     void MoveModelf( const PosVecf3& trans, const PosVecf3& angle, const PosVecf3& scale);
 
@@ -282,9 +286,6 @@ private:
     void SetHighLightBar(BatchBarInfo &barInfo);
     void DisableHighLightBar(BatchBarInfo &barInfo);
     void CalcScrollMoveMatrix(bool bNewScene);
-    glm::mat4 GetDiffOfTwoCameras(const glm::vec3& rBeginPos, const glm::vec3& rEndPos, const glm::vec3& rBeginDirection, const glm::vec3& rEndDirection);
-    void AddMatrixDiff(const glm::mat4& aMat);
-    void ResetMatrixDiff();
 private:
 
     struct ShaderResources

chart2/source/view/main/GL3DRenderer.cxx

@@ -2463,6 +2463,13 @@ glm::mat4 OpenGL3DRenderer::GetDiffOfTwoCameras(const glm::vec3& rBeginPos, cons
     return aEnd - aBegin;
 }
 
+glm::mat4 OpenGL3DRenderer::GetDiffOfTwoCameras(const glm::vec3& rEndPos, const glm::vec3& rEndDirection)
+{
+    glm::mat4 aEnd = glm::lookAt(glm::vec3(m_GlobalScaleMatrix * glm::vec4(rEndPos, 1.0)),
+                     glm::vec3(m_GlobalScaleMatrix * glm::vec4(rEndDirection, 1.0)),glm::vec3(0, 0, 1));
+    return aEnd - m_3DView;
+}
+
 glm::mat4 OpenGL3DRenderer::GetProjectionMatrix()
 {
     return m_3DProjection;