Very simple line displaying example in MFC C++

Hi,

I agree that it's quite hard to get started with OpenCASCADE. Here is the smallest sample I can provide to draw a vertex (python code):

# Simple Vertex program
from OCC.Display.SimpleGui import display, start_display
from OCC.gp import *
from OCC.BRepBuilderAPI import *
V1 = BRepBuilderAPI_MakeVertex(gp_Pnt(-20,10,-30))
display.DisplayShape(V1.Vertex())
start_display()

And, for an edge:
# Simple Edge draw
from OCC.Display.SimpleGui import display, start_display
from OCC.gp import *
from OCC.BRepBuilderAPI import *
line = gp_Lin(gp_Ax1(gp_Pnt(10,10,10),gp_Dir(1,0,0)))
edge = BRepBuilderAPI_MakeEdge(line,-20,10)
display.DisplayShape(edge.Edge())
start_display()

Code extracted from the topology_building pythonOCC sample: http://svn.gna.org/viewcvs/pythonocc/trunk/src/samples/Level1/TopologyBu...

Best Regards,

Thomas

firstly, you have to set up Visual Studio so that you could compile the mfc samples. I think you need the mfcsample.lib to compile the other examples... if you have problems with this, post it here.

then you should read the tutorial.pdf file in the "doc" folder.

you can take for example the topologyPrimitives project an try something. Here an example which display a vertex and a line if you click the "Box" button. there a interesting things coded in the examples.

but the best:
http://opencascade.blogspot.com/2009/02/topology-and-geometry-in-open-ca...

good luck

Regards
Simon

The example:

void CTopologyPrimitivesDoc::OnBox()
{
//remove old items
AIS_ListOfInteractive aList;
myAISContext->DisplayedObjects(aList);
AIS_ListIteratorOfListOfInteractive aListIterator;
for(aListIterator.Initialize(aList);aListIterator.More();aListIterator.Next()){
myAISContext->Remove(aListIterator.Value());
}

//make a point
gp_Pnt point1(100,50,10);

//make a vertex from the point
TopoDS_Vertex vertex1 = BRepBuilderAPI_MakeVertex(point1);

//make one more point
gp_Pnt point2(200,150,0);

//make an edge from the two points
TopoDS_Edge edge1 = BRepBuilderAPI_MakeEdge(point1,point2);

//display the vertex
Handle(AIS_Shape) aisBody1 = new AIS_Shape(vertex1);
myAISContext->SetColor(aisBody1,Quantity_NOC_LAVENDER,Standard_False);
myAISContext->SetMaterial(aisBody1,Graphic3d_NOM_PLASTIC,Standard_False);
myAISContext->Display(aisBody1,Standard_False);

//display the edge
Handle(AIS_Shape) aisBody2 = new AIS_Shape(edge1);
myAISContext->SetColor(aisBody2,Quantity_NOC_BLUE4,Standard_False);
myAISContext->SetMaterial(aisBody2,Graphic3d_NOM_PLASTIC,Standard_False);
myAISContext->Display(aisBody2,Standard_False);

//Zoom to the extend
Fit();
}