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#include "model.h"
#include <QFile>
#include <QSet>
#include <QTextStream>
#include <QVarLengthArray>
#include "GL/gl.h"
static Point3d readPoint(QTextStream &ts)
{
Point3d p;
ts >> p.x >> p.y >> p.z;
return p;
}
struct Edge
{
int pointA;
int pointB;
};
uint qHash(const Edge &edge)
{
return qHash(edge.pointA) ^ qHash(edge.pointB);
}
bool operator==(const Edge &a, const Edge &b)
{
return (a.pointA == b.pointA && a.pointB == b.pointB)
|| (a.pointA == b.pointB && a.pointB == b.pointA);
}
Model::Model(const QString &filename)
{
QFile file(filename);
if (!file.open(QIODevice::ReadOnly))
return;
QSet<Edge> edges;
Point3d min( 1e9, 1e9, 1e9);
Point3d max(-1e9,-1e9,-1e9);
QVector<Point3d> pointData;
QVector<Point3d> normalData;
QVector<int> pointIndices;
QVector<int> normalIndices;
QTextStream in(&file);
while (!in.atEnd()) {
QString input = in.readLine();
if (input.isEmpty() || input[0] == '#')
continue;
QTextStream ts(&input);
QString id;
ts >> id;
if (id == "v") {
Point3d p = readPoint(ts);
p.y = -p.y;
pointData << p;
min.x = qMin(min.x, p.x);
min.y = qMin(min.y, p.y);
min.z = qMin(min.z, p.z);
max.x = qMax(max.x, p.x);
max.y = qMax(max.y, p.y);
max.z = qMax(max.z, p.z);
} else if (id == "f" || id == "fo") {
QVarLengthArray<int, 4> p;
while (!ts.atEnd()) {
QString vertex;
ts >> vertex;
int index;
QTextStream vertexStream(&vertex);
vertexStream >> index;
if (vertexStream.status() == QTextStream::Ok)
p.append(index - 1);
}
for (int i = 0; i < p.size(); ++i) {
Edge edge = { p[i], p[(i + 1) % p.size()] };
edges << edge;
}
for (int i = 0; i < 3; ++i)
pointIndices << p[i];
if (p.size() == 4)
for (int i = 0; i < 3; ++i)
pointIndices << p[(i + 2) % 4];
}
}
Point3d bounds = max - min;
qreal scale = 1 / qMax(bounds.x, qMax(bounds.y, bounds.z));
for (int i = 0; i < pointData.size(); ++i) {
Point3d &p = pointData[i];
p.x -= min.x + bounds.x * 0.5;
p.y -= min.y + bounds.y * 0.5;
p.z -= min.z + bounds.z * 0.5;
p.x *= scale;
p.y *= scale;
p.z *= scale;
}
for (int i = 0; i < pointIndices.size(); ++i)
m_points << pointData.at(pointIndices.at(i));
foreach(const Edge &edge, QVector<Edge>::fromList(edges.toList()))
m_edges << pointData.at(edge.pointA) << pointData.at(edge.pointB);
}
void Model::render(bool wireframe) const
{
glEnableClientState(GL_VERTEX_ARRAY);
if (wireframe) {
glVertexPointer(3, GL_FLOAT, 0, m_edges.data());
glDrawArrays(GL_LINES, 0, m_edges.size());
} else {
glVertexPointer(3, GL_FLOAT, 0, m_points.data());
glDrawArrays(GL_TRIANGLES, 0, m_points.size());
}
glDisableClientState(GL_VERTEX_ARRAY);
}
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