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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.0 (2010/01/01)
#include "MeshEnvelope.h"
#include "CreateEnvelope.h"
WM5_WINDOW_APPLICATION(MeshEnvelope);
//----------------------------------------------------------------------------
MeshEnvelope::MeshEnvelope ()
:
WindowApplication2("SampleMathematics/MeshEnvelope", 0, 0, 512, 512,
Float4(1.0f, 1.0f, 1.0f, 1.0f))
{
mVertices = 0;
mIndices = 0;
mEnvelopeVertices = 0;
mSize = GetWidth();
}
//----------------------------------------------------------------------------
bool MeshEnvelope::OnInitialize ()
{
if (!WindowApplication2::OnInitialize())
{
return false;
}
// Load the 3D face mesh.
#ifdef WM5_LITTLE_ENDIAN
std::string path = Environment::GetPathR("FacePN.wmof");
#else
std::string path = Environment::GetPathR("FacePN.be.wmof");
#endif
InStream inStream;
inStream.Load(path);
TriMeshPtr mesh = StaticCast<TriMesh>(inStream.GetObjectAt(0));
VertexBufferAccessor vba(mesh);
mNumVertices = vba.GetNumVertices();
#if 1
// Rotate the mesh just to see how the algorithm behaves.
Matrix3f rotate(Vector3f::UNIT_X, Mathf::HALF_PI);
for (int j = 0; j < mNumVertices; ++j)
{
vba.Position<Vector3f>(j) = rotate*vba.Position<Vector3f>(j);
}
#endif
// Project the mesh onto the xy-plane.
mVertices = new1<Vector2f>(mNumVertices);
float x = vba.Position<Vector3f>(0).X();
float y = vba.Position<Vector3f>(0).Y();
mVertices[0].X() = x;
mVertices[0].Y() = y;
float xmin = x, xmax = x;
float ymin = y, ymax = y;
int i;
for (i = 1; i < mNumVertices; ++i)
{
x = vba.Position<Vector3f>(i).X();
y = vba.Position<Vector3f>(i).Y();
mVertices[i][0] = x;
mVertices[i][1] = y;
if (x < xmin)
{
xmin = x;
}
else if (x > xmax)
{
xmax = x;
}
if (y < ymin)
{
ymin = y;
}
else if (y > ymax)
{
ymax = y;
}
}
// Transform the mesh into window coordinates.
float xOffset = 0.125f*mSize;
float yOffset = 0.125f*mSize;
float xMult = (0.75f*mSize)/(xmax - xmin);
float yMult = (0.75f*mSize)/(ymax - ymin);
for (i = 0; i < mNumVertices; ++i)
{
mVertices[i].X() = xOffset + xMult*(mVertices[i].X() - xmin);
mVertices[i].Y() = yOffset + yMult*(mVertices[i].Y() - ymin);
}
// Copy the mesh connectivity information.
IndexBuffer* ibuffer = mesh->GetIndexBuffer();
mNumIndices = ibuffer->GetNumElements();
mIndices = new1<int>(mNumIndices);
size_t numBytes = mNumIndices*sizeof(int);
memcpy(mIndices, ibuffer->GetData(), numBytes);
// Create the envelope of the mesh.
CreateEnvelope(mNumVertices, mVertices, mNumIndices, mIndices,
mNumEnvelopeVertices, mEnvelopeVertices);
DoFlip(true);
OnDisplay();
return true;
}
//----------------------------------------------------------------------------
void MeshEnvelope::OnTerminate ()
{
delete1(mVertices);
delete1(mIndices);
delete1(mEnvelopeVertices);
WindowApplication2::OnTerminate();
}
//----------------------------------------------------------------------------
void MeshEnvelope::OnDisplay ()
{
ClearScreen();
// Draw the mesh triangles.
ColorRGB black(0, 0, 0);
int i, v0, v1, v2, x0, y0, x1, y1, x2, y2;
for (i = 0; i < mNumIndices; /**/)
{
v0 = mIndices[i++];
v1 = mIndices[i++];
v2 = mIndices[i++];
x0 = (int)mVertices[v0].X();
y0 = (int)mVertices[v0].Y();
x1 = (int)mVertices[v1].X();
y1 = (int)mVertices[v1].Y();
x2 = (int)mVertices[v2].X();
y2 = (int)mVertices[v2].Y();
DrawLine(x0, y0, x1, y1, black);
DrawLine(x1, y1, x2, y2, black);
DrawLine(x2, y2, x0, y0, black);
}
// Draw the mesh envelope.
ColorRGB red(255, 0, 0);
x0 = (int)mEnvelopeVertices[0].X();
y0 = (int)mEnvelopeVertices[0].Y();
x1 = x0;
y1 = y0;
for (i = 1; i < mNumEnvelopeVertices; ++i)
{
x2 = (int)mEnvelopeVertices[i].X();
y2 = (int)mEnvelopeVertices[i].Y();
DrawLine(x1, y1, x2, y2, red);
x1 = x2;
y1 = y2;
}
DrawLine(x1, y1, x0, y0, red);
WindowApplication2::OnDisplay();
}
//----------------------------------------------------------------------------
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