fdo#81237: 2D OpenGL charts have wrong size

So far the size unit was 100th mm \ OPENGL_SCALE_VALUE
which is an absolute value, independent from the actual
size of the OpenGL window.
To solve that I added the SetSizePixel() method with
which we can specify the size in pixels and which
method resize the whole scene accordingly.

Change-Id: Ibd19a1bd9484c7bc8f8ce0d8113f60b95619db39

8 files changed, 20 insertions, 15 deletions

diff --git a/chart2/source/view/inc/AbstractShapeFactory.hxx b/chart2/source/view/inc/AbstractShapeFactory.hxx
index ffa99b7526d1..b684ae28a94b 100644
--- a/chart2/source/view/inc/AbstractShapeFactory.hxx
+++ b/chart2/source/view/inc/AbstractShapeFactory.hxx
@@ -240,7 +240,7 @@ public:
      */
     virtual void render(com::sun::star::uno::Reference< com::sun::star::drawing::XShapes > xRootShape, bool bInitOpenGL = true) = 0;
 
-    virtual bool preRender(OpenGLWindow* pWindow) = 0;
+    virtual bool preRender(com::sun::star::uno::Reference< com::sun::star::drawing::XShapes > xRootShape, OpenGLWindow* pWindow) = 0;
     virtual void postRender(OpenGLWindow* pWindow) = 0;
 
     virtual void clearPage(com::sun::star::uno::Reference< com::sun::star::drawing::XShapes > xRootShape) = 0;
diff --git a/chart2/source/view/inc/OpenglShapeFactory.hxx b/chart2/source/view/inc/OpenglShapeFactory.hxx
index 6f236537b19b..9f0a360595dd 100644
--- a/chart2/source/view/inc/OpenglShapeFactory.hxx
+++ b/chart2/source/view/inc/OpenglShapeFactory.hxx
@@ -186,7 +186,7 @@ public:
 
     virtual void render(com::sun::star::uno::Reference< com::sun::star::drawing::XShapes > xDrawPage, bool bInitOpenGL = true) SAL_OVERRIDE;
 
-    virtual bool preRender(OpenGLWindow* pWindow) SAL_OVERRIDE;
+    virtual bool preRender(com::sun::star::uno::Reference< com::sun::star::drawing::XShapes > xRootShape, OpenGLWindow* pWindow) SAL_OVERRIDE;
     virtual void postRender(OpenGLWindow* pWindow) SAL_OVERRIDE;
 
     virtual void clearPage(com::sun::star::uno::Reference< com::sun::star::drawing::XShapes > xDrawPage) SAL_OVERRIDE;
diff --git a/chart2/source/view/inc/ShapeFactory.hxx b/chart2/source/view/inc/ShapeFactory.hxx
index 58076bdd61b3..d7973da941dd 100644
--- a/chart2/source/view/inc/ShapeFactory.hxx
+++ b/chart2/source/view/inc/ShapeFactory.hxx
@@ -199,7 +199,7 @@ public:
      */
     virtual void render(com::sun::star::uno::Reference< com::sun::star::drawing::XShapes >, bool ) SAL_OVERRIDE {}
 
-    virtual bool preRender(OpenGLWindow*) SAL_OVERRIDE { return true; }
+    virtual bool preRender(com::sun::star::uno::Reference< com::sun::star::drawing::XShapes >, OpenGLWindow*) SAL_OVERRIDE { return true; }
     virtual void postRender(OpenGLWindow*) SAL_OVERRIDE {}
 
     virtual void clearPage(com::sun::star::uno::Reference< com::sun::star::drawing::XShapes > ) SAL_OVERRIDE {}
diff --git a/chart2/source/view/main/ChartView.cxx b/chart2/source/view/main/ChartView.cxx
index 3a6e6f5e06c7..9d75323de847 100644
--- a/chart2/source/view/main/ChartView.cxx
+++ b/chart2/source/view/main/ChartView.cxx
@@ -2555,7 +2555,7 @@ void ChartView::render()
         OpenGLWindow* pWindow = mrChartModel.getOpenGLWindow();
         if(pWindow)
             pWindow->setRenderer(mp2DRenderer.get());
-        bool bRender = pShapeFactory->preRender(pWindow);
+        bool bRender = pShapeFactory->preRender(mxRootShape, pWindow);
         if(bRender)
         {
             pShapeFactory->render(mxRootShape, pWindow != mp2DRenderer->getOpenGLWindow());
diff --git a/chart2/source/view/main/DummyXShape.hxx b/chart2/source/view/main/DummyXShape.hxx
index 54f5df42f343..6b03733f39f8 100644
--- a/chart2/source/view/main/DummyXShape.hxx
+++ b/chart2/source/view/main/DummyXShape.hxx
@@ -398,6 +398,8 @@ public:
     void invalidateInit() { mbNotInit = true; }
     TextCache& getTextCache() { return maTextCache;}
 
+    OpenGLRender& getRenderer() { return m_GLRender; }
+
 private:
 
     TextCache maTextCache;
diff --git a/chart2/source/view/main/OpenGLRender.cxx b/chart2/source/view/main/OpenGLRender.cxx
index 6cdb5fd26268..64c94cbc0a6f 100644
--- a/chart2/source/view/main/OpenGLRender.cxx
+++ b/chart2/source/view/main/OpenGLRender.cxx
@@ -106,14 +106,6 @@ int OpenGLRender::InitOpenGL()
     glClearDepth(1.0f);
     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
-    //Init the Projection matrix
-    m_Projection = glm::ortho(0.f, float(m_iWidth), -float(m_iHeight), 0.f, -1.f, 1.f);
-    m_Projection = m_Projection * glm::scale(glm::vec3(1.0f, -1.0f, 1.0f));
-    m_View       = glm::lookAt(glm::vec3(0,0,1), // Camera is at (4,3,-3), in World Space
-                               glm::vec3(0,0,0), // and looks at the origin
-                               glm::vec3(0,1,0)  // Head is up (set to 0,-1,0 to look upside-down)
-                               );
-    m_MVP = m_Projection * m_View * m_Model;
     glGenBuffers(1, &m_VertexBuffer);
     glGenBuffers(1, &m_ColorBuffer);
 
@@ -357,8 +349,16 @@ void OpenGLRender::SetSize(int width, int height)
 {
     m_iWidth = width;
     m_iHeight = height;
-    m_Projection = glm::ortho(0.f, float(m_iWidth), -float(m_iHeight), 0.f, -4.f, 3.f);
-    m_Projection = m_Projection * glm::scale(glm::vec3(1.0f, -1.0f, 1.0f));
+}
+
+void OpenGLRender::SetSizePixel(int width, int height)
+{
+    m_Projection = glm::ortho(0.f, float(m_iWidth), 0.f, float(m_iHeight), -4.f, 3.f);
+    m_Projection = m_Projection * glm::scale((float)width / m_iWidth, -(float)height / m_iHeight, 1.0f);
+
+    m_View       = glm::lookAt(glm::vec3(0,m_iHeight,1),
+                               glm::vec3(0,m_iHeight,0),
+                               glm::vec3(0,1,0) );
 }
 
 void OpenGLRender::SetLine2DColor(sal_uInt8 r, sal_uInt8 g, sal_uInt8 b, sal_uInt8 nAlpha)
diff --git a/chart2/source/view/main/OpenGLRender.hxx b/chart2/source/view/main/OpenGLRender.hxx
index 26f81c2b5922..6203b4307608 100644
--- a/chart2/source/view/main/OpenGLRender.hxx
+++ b/chart2/source/view/main/OpenGLRender.hxx
@@ -72,6 +72,7 @@ public:
     int InitOpenGL();
     int MoveModelf(PosVecf3 trans, PosVecf3 angle, PosVecf3 scale);
     void SetSize(int width, int height);
+    void SetSizePixel(int width, int height);
     void Release();
     int RenderLine2FBO(int wholeFlag);
     int SetLine2DShapePoint(float x, float y, int listLength);
diff --git a/chart2/source/view/main/OpenglShapeFactory.cxx b/chart2/source/view/main/OpenglShapeFactory.cxx
index 9443641e3d68..0f2dfe2b9930 100644
--- a/chart2/source/view/main/OpenglShapeFactory.cxx
+++ b/chart2/source/view/main/OpenglShapeFactory.cxx
@@ -456,7 +456,7 @@ void OpenglShapeFactory::render(uno::Reference< drawing::XShapes > xRootShape, b
     rChart.render();
 }
 
-bool OpenglShapeFactory::preRender(OpenGLWindow* pWindow)
+bool OpenglShapeFactory::preRender(uno::Reference< drawing::XShapes > xRootShape, OpenGLWindow* pWindow)
 {
     if(!pWindow)
         return false;
@@ -465,6 +465,8 @@ bool OpenglShapeFactory::preRender(OpenGLWindow* pWindow)
     pWindow->getContext().makeCurrent();
     Size aSize = pWindow->GetSizePixel();
     pWindow->getContext().setWinSize(aSize);
+    dummy::DummyChart& rChart = dynamic_cast<dummy::DummyChart&>(*xRootShape.get());
+    rChart.getRenderer().SetSizePixel(aSize.Width(), aSize.Height());
     return true;
 }