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