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{
Copyright 2006-2023 Michalis Kamburelis.
This file is part of "castle-model-viewer".
"castle-model-viewer" 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.
"castle-model-viewer" 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 "castle-model-viewer"; 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, CastleVectors, CastleColors;
{ 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 Color: TCastleColor; const ModelViewProjection: TMatrix4);
implementation
uses SysUtils,
CastleRenderPrimitives, CastleGLUtils;
procedure glDrawCornerMarkers(const Box: TBox3D;
const Color: TCastleColor; const ModelViewProjection: TMatrix4);
const
Proportion = 0.1;
var
Vertexes: TVector4List;
procedure glDrawCorners(const minx, miny, minz, maxx, maxy, maxz: Single);
procedure glDrawCornerLines(const x, y, z, dx, dy, dz: Single);
begin
Vertexes.AddRange([
Vector4(x , y , z , 1),
Vector4(x + dx, y , z , 1),
Vector4(x , y , z , 1),
Vector4(x , y + dy, z , 1),
Vector4(x , y , z , 1),
Vector4(x , y , z + dz, 1)
]);
end;
var
Xlength, Ylength, Zlength: Single;
begin
Xlength := (maxx - minx) * Proportion;
Ylength := (maxy - miny) * Proportion;
Zlength := (maxz - minz) * Proportion;
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);
end;
var
Mesh: TCastleRenderUnlitMesh;
begin
Vertexes := TVector4List.Create;
try
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
);
Mesh := TCastleRenderUnlitMesh.Create(true);
try
Mesh.ModelViewProjection := ModelViewProjection;
Mesh.Color := Color;
Mesh.SetVertexes(Vertexes, false);
Mesh.Render(pmLines);
finally FreeAndNil(Mesh) end;
finally FreeAndNil(Vertexes) end;
end;
end.
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