made the textnode render triangles instead of quads

libs_required/ACG/Scenegraph/TextNode.cc

@@ -319,7 +319,7 @@ draw(GLState& _state, const DrawModes::DrawMode& /*_drawMode*/)
 
     _state.push_modelview_matrix();
     _state.scale(size_);
-    glDrawArrays(GL_QUADS, 0, int(text_.size() * 4) );
+    glDrawArrays(GL_TRIANGLES, 0, int(text_.size() * 4) );
     _state.pop_modelview_matrix();
 
     if (textMode_ == SCREEN_ALIGNED || textMode_ == SCREEN_ALIGNED_STATIC_SIZE) {
@@ -497,6 +497,24 @@ updateVBO() {
     vertexBuffer_.push_back(avgWidth*0.15);
     vertexBuffer_.push_back(0.0f);
 
+    // texture coordinates
+    vertexBuffer_.push_back(rightTx);
+    vertexBuffer_.push_back(topTx);
+    
+    // bottom left
+    vertexBuffer_.push_back(left);
+    vertexBuffer_.push_back(0.0f);
+    vertexBuffer_.push_back(0.0f);
+
+    // texture coordinates
+    vertexBuffer_.push_back(leftTx);
+    vertexBuffer_.push_back(bottomTx);
+    
+    // top right
+    vertexBuffer_.push_back(right);
+    vertexBuffer_.push_back(avgWidth*0.15);
+    vertexBuffer_.push_back(0.0f);
+
     // texture coordinates
     vertexBuffer_.push_back(rightTx);
     vertexBuffer_.push_back(topTx);
@@ -623,7 +641,7 @@ getRenderObjects(ACG::IRenderer* _renderer, ACG::GLState&  _state , const ACG::S
   localMaterial.specularColor(ACG::Vec4f(0.0, 0.0, 0.0, 0.0 ));
   ro.setMaterial(&localMaterial);
 
-  ro.glDrawArrays(GL_QUADS, 0, static_cast<GLsizei>(text_.size()) * 4);
+  ro.glDrawArrays(GL_TRIANGLES, 0, static_cast<GLsizei>(text_.size()) * 4);
   _renderer->addRenderObject(&ro);
 }