Greatly improved rendering of frame and decorators. Creation of a

DrawVisitor to selectively draw single nodes (for overlay of frame in
GeometryView)

DrawVisitor.cpp

@@ -0,0 +1,141 @@
+
+#include <glm/gtc/matrix_transform.hpp>
+
+#include "DrawVisitor.h"
+#include "Scene.h"
+
+
+DrawVisitor::DrawVisitor(Node *nodetodraw, glm::mat4 projection)
+{
+    target_ = nodetodraw;
+    modelview_ = glm::identity<glm::mat4>();
+    projection_ = projection;
+    done_ = false;
+}
+
+
+void DrawVisitor::visit(Node &n)
+{
+    // draw the target
+    if ( n.id() == target_->id()) {
+        n.draw(modelview_, projection_);
+        done_ = true;
+    }
+
+    if (done_) return;
+
+    // update transform
+    modelview_ *= n.transform_;
+}
+
+
+void DrawVisitor::visit(Group &n)
+{
+    // no need to traverse deeper if this node was drawn already
+    if (done_) return;
+
+    // traverse children
+    glm::mat4 mv = modelview_;
+    for (NodeSet::iterator node = n.begin(); !done_ && node != n.end(); node++) {
+        (*node)->accept(*this);
+        modelview_ = mv;
+    }
+}
+
+void DrawVisitor::visit(Scene &n)
+{
+    n.root()->accept(*this);
+}
+
+void DrawVisitor::visit(Switch &n)
+{
+    glm::mat4 mv = modelview_;
+    (*n.activeChild())->accept(*this);
+    modelview_ = mv;
+}
+
+void DrawVisitor::visit(Animation &n)
+{
+
+}
+
+void DrawVisitor::visit(Primitive &n)
+{
+
+}
+
+void DrawVisitor::visit(Surface &n)
+{
+
+}
+
+void DrawVisitor::visit(ImageSurface &n)
+{
+
+}
+
+void DrawVisitor::visit(FrameBufferSurface &n)
+{
+
+}
+
+void DrawVisitor::visit(MediaSurface &n)
+{
+
+}
+
+void DrawVisitor::visit(MediaPlayer &n)
+{
+
+}
+
+void DrawVisitor::visit(Shader &n)
+{
+
+}
+
+void DrawVisitor::visit(ImageShader &n)
+{
+
+}
+
+void DrawVisitor::visit(ImageProcessingShader &n)
+{
+
+}
+
+void DrawVisitor::visit(LineStrip &n)
+{
+
+}
+
+void DrawVisitor::visit(LineSquare &)
+{
+
+}
+
+void DrawVisitor::visit(LineCircle &n)
+{
+
+}
+
+void DrawVisitor::visit(Mesh &n)
+{
+
+}
+
+void DrawVisitor::visit(Frame &n)
+{
+
+}
+
+
+void DrawVisitor::visit (Source& s)
+{
+
+}
+
+void DrawVisitor::visit (MediaSource& s)
+{
+
+}