netgen/ng/Togl2.1/double.c
2016-02-08 15:53:16 +01:00

280 lines
6.8 KiB
C

/* $Id: double.c,v 1.22 2009/03/12 23:59:35 gregcouch Exp $ */
/*
* Togl - a Tk OpenGL widget
* Copyright (C) 1996-1997 Brian Paul and Ben Bederson
* Copyright (C) 2006-2007 Greg Couch
* See the LICENSE file for copyright details.
*/
#define USE_TOGL_STUBS
#include "togl.h"
#include <stdlib.h>
#include <string.h>
#include <math.h>
#undef TCL_STORAGE_CLASS
#define TCL_STORAGE_CLASS DLLEXPORT
static Tcl_Obj *toglFont;
static double xAngle = 0, yAngle = 0, zAngle = 0;
static GLdouble CornerX, CornerY, CornerZ; /* where to print strings */
/*
* Togl widget create callback. This is called by Tcl/Tk when the widget has
* been realized. Here's where one may do some one-time context setup or
* initializations.
*/
static int
create_cb(ClientData clientData, Tcl_Interp *interp, int objc,
Tcl_Obj *const *objv)
{
Togl *togl;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "pathName");
return TCL_ERROR;
}
if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK) {
return TCL_ERROR;
}
if (!toglFont)
toglFont = Togl_LoadBitmapFont(togl, "Helvetica");
if (!toglFont) {
static int shown;
if (!shown) {
fprintf(stderr, "Couldn't load font!\n");
shown = 1;
}
}
return TCL_OK;
}
/*
* Togl widget reshape callback. This is called by Tcl/Tk when the widget
* has been resized. Typically, we call glViewport and perhaps setup the
* projection matrix.
*/
static int
reshape_cb(ClientData clientData, Tcl_Interp *interp, int objc,
Tcl_Obj *const *objv)
{
int width;
int height;
double aspect;
Togl *togl;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "pathName");
return TCL_ERROR;
}
if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK) {
return TCL_ERROR;
}
width = Togl_Width(togl);
height = Togl_Height(togl);
aspect = (double) width / (double) height;
glViewport(0, 0, width, height);
/* Set up projection transform */
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(-aspect, aspect, -1, 1, 1, 10);
CornerX = -aspect;
CornerY = -1;
CornerZ = -1.1;
/* Change back to model view transform for rendering */
glMatrixMode(GL_MODELVIEW);
return TCL_OK;
}
static void
print_string(Togl *togl, const char *s)
{
if (toglFont)
Togl_WriteChars(togl, toglFont, s, 0);
}
/*
* Togl widget display callback. This is called by Tcl/Tk when the widget's
* contents have to be redrawn. Typically, we clear the color and depth
* buffers, render our objects, then swap the front/back color buffers.
*/
static int
display_cb(ClientData clientData, Tcl_Interp *interp, int objc,
Tcl_Obj *const *objv)
{
static GLuint cubeList = 0;
const char *ident;
Togl *togl;
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "pathName");
return TCL_ERROR;
}
if (Togl_GetToglFromObj(interp, objv[1], &togl) != TCL_OK)
return TCL_ERROR;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity(); /* Reset modelview matrix to the identity
* matrix */
glTranslatef(0, 0, -3); /* Move the camera back three units */
glRotated(xAngle, 1, 0, 0); /* Rotate by X, Y, and Z angles */
glRotated(yAngle, 0, 1, 0);
glRotated(zAngle, 0, 0, 1);
glEnable(GL_DEPTH_TEST);
if (!cubeList) {
cubeList = glGenLists(1);
glNewList(cubeList, GL_COMPILE);
/* Front face */
glBegin(GL_QUADS);
glColor3f(0, 0.7f, 0.1f); /* Green */
glVertex3f(-1, 1, 1);
glVertex3f(1, 1, 1);
glVertex3f(1, -1, 1);
glVertex3f(-1, -1, 1);
/* Back face */
glColor3f(0.9f, 1, 0); /* Yellow */
glVertex3f(-1, 1, -1);
glVertex3f(1, 1, -1);
glVertex3f(1, -1, -1);
glVertex3f(-1, -1, -1);
/* Top side face */
glColor3f(0.2f, 0.2f, 1); /* Blue */
glVertex3f(-1, 1, 1);
glVertex3f(1, 1, 1);
glVertex3f(1, 1, -1);
glVertex3f(-1, 1, -1);
/* Bottom side face */
glColor3f(0.7f, 0, 0.1f); /* Red */
glVertex3f(-1, -1, 1);
glVertex3f(1, -1, 1);
glVertex3f(1, -1, -1);
glVertex3f(-1, -1, -1);
glEnd();
glEndList();
}
glCallList(cubeList);
glDisable(GL_DEPTH_TEST);
glLoadIdentity();
glColor3f(1, 1, 1);
glRasterPos3d(CornerX, CornerY, CornerZ);
ident = Togl_Ident(togl);
if (ident)
print_string(togl, ident);
Togl_SwapBuffers(togl);
return TCL_OK;
}
static int
setXrot_cb(ClientData clientData, Tcl_Interp *interp, int objc,
Tcl_Obj *const *objv)
{
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "angle");
return TCL_ERROR;
}
if (Tcl_GetDoubleFromObj(interp, objv[1], &xAngle) != TCL_OK) {
return TCL_ERROR;
}
/* printf( "before %f ", xAngle ); */
xAngle = fmod(xAngle, 360.0);
if (xAngle < 0)
xAngle += 360.0;
/* printf( "after %f \n", xAngle ); */
/* Let result string equal value */
Tcl_SetObjResult(interp, objv[1]);
return TCL_OK;
}
static int
setYrot_cb(ClientData clientData, Tcl_Interp *interp, int objc,
Tcl_Obj *const *objv)
{
if (objc != 2) {
Tcl_WrongNumArgs(interp, 1, objv, "pathName angle");
return TCL_ERROR;
}
if (Tcl_GetDoubleFromObj(interp, objv[1], &yAngle) != TCL_OK) {
return TCL_ERROR;
}
yAngle = fmod(yAngle, 360.0);
if (yAngle < 0)
yAngle += 360.0;
/* Let result string equal value */
Tcl_SetObjResult(interp, objv[1]);
return TCL_OK;
}
/*
* Called by Tcl to let me initialize the modules (Togl) I will need.
*/
EXTERN int
Double_Init(Tcl_Interp *interp)
{
/*
* Initialize Tcl and the Togl widget module.
*/
if (Tcl_InitStubs(interp, "8.1", 0) == NULL
|| Togl_InitStubs(interp, "2.0", 0) == NULL) {
return TCL_ERROR;
}
/*
* Specify the C callback functions for widget creation, display,
* and reshape.
*/
Tcl_CreateObjCommand(interp, "double::create_cb", create_cb, NULL, NULL);
Tcl_CreateObjCommand(interp, "double::display_cb", display_cb, NULL, NULL);
Tcl_CreateObjCommand(interp, "double::reshape_cb", reshape_cb, NULL, NULL);
/*
* Make a new Togl widget command so the Tcl code can set a C variable.
*/
Tcl_CreateObjCommand(interp, "double::setXrot", setXrot_cb, NULL, NULL);
Tcl_CreateObjCommand(interp, "double::setYrot", setYrot_cb, NULL, NULL);
/*
* Call Tcl_CreateCommand for application-specific commands, if
* they weren't already created by the init procedures called above.
*/
return TCL_OK;
}