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FROG_Primitives.cpp
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FROG_Primitives.cpp
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#include "FROG_Primitives.h"
#ifdef FROG_OPENGL
void SetNormal(float C1X, float C1Y, float C1Z,
float C2X, float C2Y, float C2Z,
float C3X, float C3Y, float C3Z){
#ifdef FROG_LIGHTING
float X = (C1Y-C2Y)*(C2Z-C3Z) - (C1Z-C2Z)*(C2Y-C3Y);
float Y = (C1Z-C2Z)*(C2X-C3X) - (C1X-C2X)*(C2Z-C3Z);
float Z = (C1X-C2X)*(C2Y-C3Y) - (C1Y-C2Y)*(C2X-C3X);
float N = sqrt(X*X+Y*Y+Z*Z);
X /= N;Y /= N;Z /= N;
glNormal3f(X,Y,Z);
#endif
}
void DrawNormal(float C1X, float C1Y, float C1Z,
float C2X, float C2Y, float C2Z,
float C3X, float C3Y, float C3Z){
/*
glBegin (GL_TRIANGLES);
glVertex3f (C1X,C1Y,C1Z);
glVertex3f (C2X,C2Y,C2Z);
glVertex3f (C3X,C3Y,C3Z);
glEnd();
*/
float X = (C1Y-C2Y)*(C2Z-C3Z) - (C1Z-C2Z)*(C2Y-C3Y);
float Y = (C1Z-C2Z)*(C2X-C3X) - (C1X-C2X)*(C2Z-C3Z);
float Z = (C1X-C2X)*(C2Y-C3Y) - (C1Y-C2Y)*(C2X-C3X);
float N = sqrt(X*X+Y*Y+Z*Z);
N /= 25;
X /= N;Y /= N;Z /= N;
glColor3f(0,1,0);
glBegin (GL_LINES);
glVertex3f ((C1X+C2X+C3X)/3 ,(C1Y+C2Y+C3Y)/3 ,(C1Z+C2Z+C3Z)/3 ); //+++
glVertex3f ((C1X+C2X+C3X)/3+X,(C1Y+C2Y+C3Y)/3+Y,(C1Z+C2Z+C3Z)/3+Z); //+-+
glEnd();
}
void DrawCube(float C1X, float C1Y, float C1Z,
float C2X, float C2Y, float C2Z,
float C3X, float C3Y, float C3Z,
float C4X, float C4Y, float C4Z,
float C5X, float C5Y, float C5Z,
float C6X, float C6Y, float C6Z,
float C7X, float C7Y, float C7Z,
float C8X, float C8Y, float C8Z){
glBegin (GL_QUADS);
SetNormal(C1X,C1Y,C1Z,C4X,C4Y,C4Z,C3X,C3Y,C3Z);
glVertex3f (C1X,C1Y,C1Z); //+++
glVertex3f (C4X,C4Y,C4Z); //+-+
glVertex3f (C3X,C3Y,C3Z); //--+
glVertex3f (C2X,C2Y,C2Z); //-++
SetNormal(C5X,C5Y,C5Z,C6X,C6Y,C6Z,C7X,C7Y,C7Z);
glVertex3f (C5X,C5Y,C5Z); //++-
glVertex3f (C6X,C6Y,C6Z); //-+-
glVertex3f (C7X,C7Y,C7Z); //---
glVertex3f (C8X,C8Y,C8Z); //+--
SetNormal(C1X,C1Y,C1Z,C2X,C2Y,C2Z,C6X,C6Y,C6Z);
glVertex3f (C1X,C1Y,C1Z); //+++
glVertex3f (C2X,C2Y,C2Z); //-++
glVertex3f (C6X,C6Y,C6Z); //-+-
glVertex3f (C5X,C5Y,C5Z); //++-
SetNormal(C4X,C4Y,C4Z,C8X,C8Y,C8Z,C7X,C7Y,C7Z);
glVertex3f (C4X,C4Y,C4Z); //+-+
glVertex3f (C8X,C8Y,C8Z); //+--
glVertex3f (C7X,C7Y,C7Z); //---
glVertex3f (C3X,C3Y,C3Z); //--+
SetNormal(C1X,C1Y,C1Z,C5X,C5Y,C5Z,C8X,C8Y,C8Z);
glVertex3f (C1X,C1Y,C1Z); //+++
glVertex3f (C5X,C5Y,C5Z); //++-
glVertex3f (C8X,C8Y,C8Z); //+--
glVertex3f (C4X,C4Y,C4Z); //+-+
SetNormal(C2X,C2Y,C2Z,C3X,C3Y,C3Z,C7X,C7Y,C7Z);
glVertex3f (C2X,C2Y,C2Z); //-++
glVertex3f (C3X,C3Y,C3Z); //--+
glVertex3f (C7X,C7Y,C7Z); //---
glVertex3f (C6X,C6Y,C6Z); //-+-
glEnd();
/*
glEnable(GL_POLYGON_OFFSET_LINE);
glPolygonOffset(0,100);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
glBegin (GL_QUADS);
SetNormal(C1X,C1Y,C1Z,C4X,C4Y,C4Z,C3X,C3Y,C3Z);
glVertex3f (C1X,C1Y,C1Z); //+++
glVertex3f (C4X,C4Y,C4Z); //+-+
glVertex3f (C3X,C3Y,C3Z); //--+
glVertex3f (C2X,C2Y,C2Z); //-++
SetNormal(C5X,C5Y,C5Z,C6X,C6Y,C6Z,C7X,C7Y,C7Z);
glVertex3f (C5X,C5Y,C5Z); //++-
glVertex3f (C6X,C6Y,C6Z); //-+-
glVertex3f (C7X,C7Y,C7Z); //---
glVertex3f (C8X,C8Y,C8Z); //+--
SetNormal(C1X,C1Y,C1Z,C2X,C2Y,C2Z,C6X,C6Y,C6Z);
glVertex3f (C1X,C1Y,C1Z); //+++
glVertex3f (C2X,C2Y,C2Z); //-++
glVertex3f (C6X,C6Y,C6Z); //-+-
glVertex3f (C5X,C5Y,C5Z); //++-
SetNormal(C4X,C4Y,C4Z,C8X,C8Y,C8Z,C7X,C7Y,C7Z);
glVertex3f (C4X,C4Y,C4Z); //+-+
glVertex3f (C8X,C8Y,C8Z); //+--
glVertex3f (C7X,C7Y,C7Z); //---
glVertex3f (C3X,C3Y,C3Z); //--+
SetNormal(C1X,C1Y,C1Z,C5X,C5Y,C5Z,C8X,C8Y,C8Z);
glVertex3f (C1X,C1Y,C1Z); //+++
glVertex3f (C5X,C5Y,C5Z); //++-
glVertex3f (C8X,C8Y,C8Z); //+--
glVertex3f (C4X,C4Y,C4Z); //+-+
SetNormal(C2X,C2Y,C2Z,C3X,C3Y,C3Z,C7X,C7Y,C7Z);
glVertex3f (C2X,C2Y,C2Z); //-++
glVertex3f (C3X,C3Y,C3Z); //--+
glVertex3f (C7X,C7Y,C7Z); //---
glVertex3f (C6X,C6Y,C6Z); //-+-
glEnd();
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
*/
}
#endif

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