private void SetCurrentPoint()
{
var SnapPoints = this.GetSnapPoints();
if (SnapPoints.Length > 0)
{
SnapPoint p = FindClosestPoint(SnapPoints);
this.CurrentPoint = p;
_SwapBufferRequired = true;
}
else
{
if (this.Snapping != null)
{
this.Snapping(new SnapEventArgs());
}
else
{
ScreenToPlane(CurrentLocation, this.Camera.NearPlane, out CurrentPoint);
}
}
}
private SnapPoint FindClosestPoint(SnapPoint[] snapPoints)
{
double minDist = double.MaxValue;
int i = 0;
int index = 0;
foreach (SnapPoint vertex in snapPoints)
{
Point3D vertexScreen = WorldToScreen(vertex);
Point2D currentScreen = new Point2D(CurrentLocation.X, Size.Height - CurrentLocation.Y);
double dist = Point2D.Distance(vertexScreen, currentScreen);
if (dist < minDist)
{
index = i;
minDist = dist;
}
i++;
}
SnapPoint snap = (SnapPoint)snapPoints.GetValue(index);
//DisplaySnappedVertex(snap);
return(snap);
}
private void DisplaySnappedVertex(SnapPoint snap)
{
renderContext.SetLineSize(2);
// white color
renderContext.SetColorWireframe(System.Drawing.Color.Yellow);
renderContext.SetState(depthStencilStateType.DepthTestOff);
Point2D onScreen = WorldToScreen(snap);
switch (snap.Type)
{
case SnapState.SnapType.POINT:
DrawCircle(new System.Drawing.Point((int)onScreen.X, (int)(onScreen.Y)));
DrawCross(new System.Drawing.Point((int)onScreen.X, (int)(onScreen.Y)));
break;
case SnapState.SnapType.CENTER:
DrawCircle(new System.Drawing.Point((int)onScreen.X, (int)(onScreen.Y)));
break;
case SnapState.SnapType.END:
DrawQuad(new System.Drawing.Point((int)onScreen.X, (int)(onScreen.Y)));
break;
case SnapState.SnapType.MID:
DrawTriangle(new System.Drawing.Point((int)onScreen.X, (int)(onScreen.Y)));
break;
case SnapState.SnapType.QUAD:
renderContext.SetLineSize(3.0f);
DrawRhombus(new System.Drawing.Point((int)onScreen.X, (int)(onScreen.Y)));
break;
}
renderContext.SetLineSize(1);
}
