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{
Copyright 2006-2022 Michalis Kamburelis.
This file is part of "view3dscene".
"view3dscene" is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
"view3dscene" is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with "view3dscene"; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
----------------------------------------------------------------------------
}
{ glDrawCornerMarkers utility. }
unit V3DSceneBoxes;
{$I v3dsceneconf.inc}
interface
uses CastleBoxes;
{$ifndef OpenGLES}
{ Draw corner markers (3 lines) at the 8 corners of the box.
Proportion is the fraction of the box length, the marker extends too. }
procedure glDrawCornerMarkers(const Box: TBox3D; const Proportion: Single = 0.1);
{$endif}
implementation
uses {$ifdef FPC} CastleGL {$else} GL, GLExt {$endif};
{$ifndef OpenGLES}
procedure glDrawCornerMarkers(const Box: TBox3D; const Proportion: Single);
procedure glDrawCorners(const minx, miny, minz, maxx, maxy, maxz: Single);
procedure glDrawCornerLines(const x, y, z, dx, dy, dz: Single);
begin
glVertex3f(x, y, z);
glVertex3f(x+dx, y, z);
glVertex3f(x, y, z);
glVertex3f(x, y+dy, z);
glVertex3f(x, y, z);
glVertex3f(x, y, z+dz);
end;
var
Xlength, Ylength, Zlength: Single;
begin
Xlength := (maxx - minx) * Proportion;
Ylength := (maxy - miny) * Proportion;
Zlength := (maxz - minz) * Proportion;
glBegin(GL_LINES);
glDrawCornerLines(minx,miny,minz,Xlength,Ylength,Zlength);
glDrawCornerLines(minx,miny,maxz,Xlength,Ylength,-Zlength);
glDrawCornerLines(minx,maxy,minz,Xlength,-Ylength,Zlength);
glDrawCornerLines(minx,maxy,maxz,Xlength,-Ylength,-Zlength);
glDrawCornerLines(maxx,miny,minz,-Xlength,Ylength,Zlength);
glDrawCornerLines(maxx,miny,maxz,-Xlength,Ylength,-Zlength);
glDrawCornerLines(maxx,maxy,minz,-Xlength,-Ylength,Zlength);
glDrawCornerLines(maxx,maxy,maxz,-Xlength,-Ylength,-Zlength);
glEnd;
end;
begin
glDrawCorners(
Box.Data[0].X, Box.Data[0].Y, Box.Data[0].Z,
Box.Data[1].X, Box.Data[1].Y, Box.Data[1].Z
);
end;
{$endif}
end.
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