using System;
using System.Collections.Generic;
using System.Text;
using Tao.FreeGlut;
using Tao.OpenGl;
namespace OpenGLOneWindow6Views
{
partial class OpenGLOneWindow6Views
{
// This function is used for the navigation keys
public static void keyboard(byte key, int x, int y)
{
switch (key)
{
// x,X,y,Y,z,Z uses the glRotatef() function
case 120: // x // Rotates screen on x axis
rotX -= 2.0f;
break;
case 88: // X // Opposite way
rotX += 2.0f;
break;
case 121: // y // Rotates screen on y axis
rotY -= 2.0f;
break;
case 89: // Y // Opposite way
rotY += 2.0f;
break;
case 122: // z // Rotates screen on z axis
rotZ -= 2.0f;
break;
case 90: // Z // Opposite way
rotZ += 2.0f;
break;
// j,J,k,K,l,L uses the gluLookAt function for navigation
case 106: // j
rotLx -= 2.0f;
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();
Glu.gluLookAt(rotLx, rotLy, 15.0 + rotLz, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
break;
case 74: // J
rotLx += 2.0f;
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();
Glu.gluLookAt(rotLx, rotLy, 15.0 + rotLz, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
break;
case 107: // k
rotLy -= 2.0f;
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();
Glu.gluLookAt(rotLx, rotLy, 15.0 + rotLz, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
break;
case 75: // K
rotLy += 2.0f;
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();
Glu.gluLookAt(rotLx, rotLy, 15.0 + rotLz, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
break;
case 108: // (l) It has a special case when the rotLZ becames less than -15 the screen is viewed from the opposite side
// therefore this if statement below does not allow rotLz be less than -15
if (rotLz + 14 >= 0)
rotLz -= 2.0f;
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();
Glu.gluLookAt(rotLx, rotLy, 15.0 + rotLz, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
break;
case 76: // L
rotLz += 2.0f;
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();
Glu.gluLookAt(rotLx, rotLy, 15.0 + rotLz, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);
break;
case 98: // b // Rotates on x axis by -90 degree
rotX -= 90.0f;
break;
case 66: // B // Rotates on y axis by 90 degree
rotX += 90.0f;
break;
case 110: // n // Rotates on y axis by -90 degree
rotY -= 90.0f;
break;
case 78: // N // Rotates on y axis by 90 degree
rotY += 90.0f;
break;
case 109: // m // Rotates on z axis by -90 degree
rotZ -= 90.0f;
break;
case 77: // M // Rotates on z axis by 90 degree
rotZ += 90.0f;
break;
case 111: // o // Resets all parameters
case 80: // O // Displays the cube in the starting position
rotation = false;
X = Y = 0.0f;
Z = 0.0f;
rotX = 0.0f;
rotY = 0.0f;
rotZ = 0.0f;
rotLx = 0.0f;
rotLy = 0.0f;
rotLz = 0.0f;
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();
Glu.gluLookAt(rotLx, rotLy, 15.0f + rotLz, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
break;
}
Glut.glutPostRedisplay(); // Redraw the scene
}
// Called on special key pressed
private static void specialKey(int key, int x, int y)
{
// Check which key is pressed
switch (key)
{
case Glut.GLUT_KEY_LEFT: // Rotate on x axis
X -= 2.0f;
break;
case Glut.GLUT_KEY_RIGHT: // Rotate on x axis (opposite)
X += 2.0f;
break;
case Glut.GLUT_KEY_UP: // Rotate on y axis
Y += 2.0f;
break;
case Glut.GLUT_KEY_DOWN: // Rotate on y axis (opposite)
Y -= 2.0f;
break;
case Glut.GLUT_KEY_PAGE_UP: // Roatae on z axis
Z -= 2.0f;
break;
case Glut.GLUT_KEY_PAGE_DOWN:// Roatae on z axis (opposite)
Z += 2.0f;
break;
case Glut.GLUT_KEY_F1: // Enable/Disable coordinate lines
lines = !lines;
break;
case Glut.GLUT_KEY_F2: // Enable/Disable automatic rotation
rotation = !rotation;
break;
default:
break;
}
Glut.glutPostRedisplay(); // Redraw the scene
}
// Caputure the mouse click event
static void processMouseActiveMotion(int button, int state, int x, int y)
{
mousePressed = button; // Capture which mouse button is down
old_x = x; // Capture the x value
old_y = y; // Capture the y value
}
// Translate the x,y windows coordinates to OpenGL coordinates
static void processMouse(int x, int y)
{
if ((mousePressed == 0)) // If left mouse button is pressed
{
X = (x - old_x) / 15; // I did divide by 15 to adjust fo a nice translation
Y = -(y - old_y) / 15;
}
Glut.glutPostRedisplay();
}
// Get the mouse wheel direction
static void processMouseWheel(int wheel, int direction, int x, int y)
{
Z += direction; // Adjust the Z value
Glut.glutPostRedisplay();
}
// Initiliaze the OpenGL window
static void init()
{
Gl.glShadeModel(Gl.GL_SMOOTH); // Set the shading model to smooth
Gl.glClearColor(0, 0, 0, 1.0f); // Clear the Color
Gl.glClear(Gl.GL_COLOR_BUFFER_BIT | Gl.GL_DEPTH_BUFFER_BIT); // Clear the Color and Depth Buffer
Gl.glClearDepth(1.0f); // Set the Depth buffer value (ranges[0,1])
Gl.glEnable(Gl.GL_DEPTH_TEST); // Enable Depth test
Gl.glDepthFunc(Gl.GL_LEQUAL); // If two objects on the same coordinate show the first drawn
Gl.glHint(Gl.GL_PERSPECTIVE_CORRECTION_HINT, Gl.GL_NICEST);
Gl.glDisable(Gl.GL_CULL_FACE);
}
// This function is called whenever the window size is changed
static void reshape(int w, int h)
{
Gl.glClearColor(0, 0, 0, 0.0f);
Gl.glViewport(0, 0, w, h); // Set the viewport
Gl.glMatrixMode(Gl.GL_PROJECTION); // Set the Matrix mode
Gl.glLoadIdentity();
Glu.gluPerspective(75f, (float)w / (float)h, 0.10f, 500.0f);
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();
Glu.gluLookAt(rotLx, rotLy, 15.0f + rotLz, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
}
}
}
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