private void RenderGUI()
{
//============================================================================
// Render a visual marker to highlight the node that is being manipulated
//============================================================================
if (solver.HandleNodeIndex != -1 || solver.NearestNodeIndex != -1)
{
CameraData camera = DynaShapeViewExtension.CameraData;
Triple camOrigin = new Triple(camera.EyePosition.X, -camera.EyePosition.Z, camera.EyePosition.Y);
Triple camZ = new Triple(camera.LookDirection.X, -camera.LookDirection.Z, camera.LookDirection.Y).Normalise();
Triple camY = new Triple(camera.UpDirection.X, -camera.UpDirection.Z, camera.UpDirection.Y).Normalise();
Triple camX = camZ.Cross(camY);
int nodeIndex = solver.HandleNodeIndex != -1 ? solver.HandleNodeIndex : solver.NearestNodeIndex;
Triple v = solver.Nodes[nodeIndex].Position - camOrigin;
float screenDistance = (float)camera.NearPlaneDistance + 0.1f;
v = camOrigin + v * screenDistance / v.Dot(camZ);
float markerSize = 0.025f * screenDistance;
Triple v1 = v + camX * markerSize;
Triple v2 = v - camY * markerSize;
Triple v3 = v - camX * markerSize;
Triple v4 = v + camY * markerSize;
lineGeometry.Positions.Add(v1.ToVector3());
lineGeometry.Positions.Add(v3.ToVector3());
lineGeometry.Positions.Add(v2.ToVector3());
lineGeometry.Positions.Add(v4.ToVector3());
markerSize *= 0.5f;
v1 = v + camX * markerSize;
v2 = v - camY * markerSize;
v3 = v - camX * markerSize;
v4 = v + camY * markerSize;
lineGeometry.Positions.Add(v1.ToVector3());
lineGeometry.Positions.Add(v2.ToVector3());
lineGeometry.Positions.Add(v2.ToVector3());
lineGeometry.Positions.Add(v3.ToVector3());
lineGeometry.Positions.Add(v3.ToVector3());
lineGeometry.Positions.Add(v4.ToVector3());
lineGeometry.Positions.Add(v4.ToVector3());
lineGeometry.Positions.Add(v1.ToVector3());
int temp = lineGeometry.Indices.Count;
for (int i = 0; i < 12; i++)
{
lineGeometry.Indices.Add(temp + i);
lineGeometry.Colors.Add(Color.OrangeRed);
}
}
}
public void DrawText(string text, Triple position)
{
billboardText.TextInfo.Add(new TextInfo(text, position.ToVector3()));
}