From bd0f3345a938b35ce6a12f6150373b0955b8dd12 Mon Sep 17 00:00:00 2001
From: Timothy Pearson <kb9vqf@pearsoncomputing.net>
Date: Sun, 10 Jul 2011 15:24:15 -0500
Subject: Add Qt3 development HEAD version

---
 examples/opengl/overlay_x11/gearwidget.cpp | 268 +++++++++++++++++++++++++++++
 1 file changed, 268 insertions(+)
 create mode 100644 examples/opengl/overlay_x11/gearwidget.cpp

(limited to 'examples/opengl/overlay_x11/gearwidget.cpp')

diff --git a/examples/opengl/overlay_x11/gearwidget.cpp b/examples/opengl/overlay_x11/gearwidget.cpp
new file mode 100644
index 0000000..e98938d
--- /dev/null
+++ b/examples/opengl/overlay_x11/gearwidget.cpp
@@ -0,0 +1,268 @@
+/****************************************************************************
+**
+** Copyright (C) 1992-2008 Trolltech ASA.  All rights reserved.
+**
+** This file is part of an example program for Qt.  This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+//
+// A Qt OpenGL widget that draws a gear.
+//
+// Portions of this code has been borrowed from Brian Paul's Mesa
+// distribution.
+//
+
+#include "gearwidget.h"
+#include <math.h>
+#if defined(Q_WS_X11)
+#include <X11/Xlib.h>
+#endif
+
+#if defined(Q_CC_MSVC)
+#pragma warning(disable:4305) // init: truncation from const double to float
+#endif
+
+/*
+ * Draw a gear wheel.  You'll probably want to call this function when
+ * building a display list since we do a lot of trig here.
+ *
+ * Input:  inner_radius - radius of hole at center
+ *	   outer_radius - radius at center of teeth
+ *	   width - width of gear
+ *	   teeth - number of teeth
+ *	   tooth_depth - depth of tooth
+ */
+static void gear( GLfloat inner_radius, GLfloat outer_radius, GLfloat width,
+		  GLint teeth, GLfloat tooth_depth )
+{
+    GLint i;
+    GLfloat r0, r1, r2;
+    GLfloat angle, da;
+    GLfloat u, v, len;
+
+    r0 = inner_radius;
+    r1 = outer_radius - tooth_depth/2.0;
+    r2 = outer_radius + tooth_depth/2.0;
+
+    const double pi = 3.14159264;
+    da = 2.0*pi / teeth / 4.0;
+
+    glShadeModel( GL_FLAT );
+
+    glNormal3f( 0.0, 0.0, 1.0 );
+
+    /* draw front face */
+    glBegin( GL_QUAD_STRIP );
+    for (i=0;i<=teeth;i++) {
+	angle = i * 2.0*pi / teeth;
+	glVertex3f( r0*cos(angle), r0*sin(angle), width*0.5 );
+	glVertex3f( r1*cos(angle), r1*sin(angle), width*0.5 );
+	glVertex3f( r0*cos(angle), r0*sin(angle), width*0.5 );
+	glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), width*0.5 );
+    }
+    glEnd();
+
+    /* draw front sides of teeth */
+    glBegin( GL_QUADS );
+    da = 2.0*pi / teeth / 4.0;
+    for (i=0;i<teeth;i++) {
+	angle = i * 2.0*pi / teeth;
+
+	glVertex3f( r1*cos(angle),      r1*sin(angle),	  width*0.5 );
+	glVertex3f( r2*cos(angle+da),   r2*sin(angle+da),	  width*0.5 );
+	glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), width*0.5 );
+	glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), width*0.5 );
+    }
+    glEnd();
+
+
+    glNormal3f( 0.0, 0.0, -1.0 );
+
+    /* draw back face */
+    glBegin( GL_QUAD_STRIP );
+    for (i=0;i<=teeth;i++) {
+	angle = i * 2.0*pi / teeth;
+	glVertex3f( r1*cos(angle), r1*sin(angle), -width*0.5 );
+	glVertex3f( r0*cos(angle), r0*sin(angle), -width*0.5 );
+	glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), -width*0.5 );
+	glVertex3f( r0*cos(angle), r0*sin(angle), -width*0.5 );
+    }
+    glEnd();
+
+    /* draw back sides of teeth */
+    glBegin( GL_QUADS );
+    da = 2.0*pi / teeth / 4.0;
+    for (i=0;i<teeth;i++) {
+	angle = i * 2.0*pi / teeth;
+
+	glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), -width*0.5 );
+	glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), -width*0.5 );
+	glVertex3f( r2*cos(angle+da),   r2*sin(angle+da),	  -width*0.5 );
+	glVertex3f( r1*cos(angle),      r1*sin(angle),	  -width*0.5 );
+    }
+    glEnd();
+
+
+    /* draw outward faces of teeth */
+    glBegin( GL_QUAD_STRIP );
+    for (i=0;i<teeth;i++) {
+	angle = i * 2.0*pi / teeth;
+
+	glVertex3f( r1*cos(angle),      r1*sin(angle),	   width*0.5 );
+	glVertex3f( r1*cos(angle),      r1*sin(angle),	  -width*0.5 );
+	u = r2*cos(angle+da) - r1*cos(angle);
+	v = r2*sin(angle+da) - r1*sin(angle);
+	len = sqrt( u*u + v*v );
+	u /= len;
+	v /= len;
+	glNormal3f( v, -u, 0.0 );
+	glVertex3f( r2*cos(angle+da),   r2*sin(angle+da),	   width*0.5 );
+	glVertex3f( r2*cos(angle+da),   r2*sin(angle+da),	  -width*0.5 );
+	glNormal3f( cos(angle), sin(angle), 0.0 );
+	glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da),  width*0.5 );
+	glVertex3f( r2*cos(angle+2*da), r2*sin(angle+2*da), -width*0.5 );
+	u = r1*cos(angle+3*da) - r2*cos(angle+2*da);
+	v = r1*sin(angle+3*da) - r2*sin(angle+2*da);
+	glNormal3f( v, -u, 0.0 );
+	glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da),  width*0.5 );
+	glVertex3f( r1*cos(angle+3*da), r1*sin(angle+3*da), -width*0.5 );
+	glNormal3f( cos(angle), sin(angle), 0.0 );
+    }
+
+    glVertex3f( r1*cos(0.0), r1*sin(0.0), width*0.5 );
+    glVertex3f( r1*cos(0.0), r1*sin(0.0), -width*0.5 );
+
+    glEnd();
+
+
+    glShadeModel( GL_SMOOTH );
+
+    /* draw inside radius cylinder */
+    glBegin( GL_QUAD_STRIP );
+    for (i=0;i<=teeth;i++) {
+	angle = i * 2.0*pi / teeth;
+	glNormal3f( -cos(angle), -sin(angle), 0.0 );
+	glVertex3f( r0*cos(angle), r0*sin(angle), -width*0.5 );
+	glVertex3f( r0*cos(angle), r0*sin(angle), width*0.5 );
+    }
+    glEnd();
+
+}
+
+
+static GLfloat view_rotx=20.0, view_roty=30.0, view_rotz=0.0;
+static GLint gear1, gear2, gear3;
+static GLfloat angle = 0.0;
+
+
+static void draw()
+{
+    angle += 2.0;
+    view_roty += 1.0;
+
+    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+    glPushMatrix();
+    glRotatef( view_rotx, 1.0, 0.0, 0.0 );
+    glRotatef( view_roty, 0.0, 1.0, 0.0 );
+    glRotatef( view_rotz, 0.0, 0.0, 1.0 );
+
+    glPushMatrix();
+    glTranslatef( -3.0, -2.0, 0.0 );
+    glRotatef( angle, 0.0, 0.0, 1.0 );
+    glCallList(gear1);
+    glPopMatrix();
+
+    glPushMatrix();
+    glTranslatef( 3.1, -2.0, 0.0 );
+    glRotatef( -2.0*angle-9.0, 0.0, 0.0, 1.0 );
+    glCallList(gear2);
+    glPopMatrix();
+
+    glPushMatrix();
+    glTranslatef( -3.1, 2.2, -1.8 );
+    glRotatef( 90.0, 1.0, 0.0, 0.0 );
+    glRotatef( 2.0*angle-2.0, 0.0, 0.0, 1.0 );
+    glCallList(gear3);
+    glPopMatrix();
+
+    glPopMatrix();
+}
+
+
+
+GearWidget::GearWidget( QWidget *parent, const char *name )
+     : QGLWidget( parent, name )
+{
+}
+
+void GearWidget::initializeGL()
+{
+    static GLfloat pos[4] = {5.0, 5.0, 10.0, 1.0 };
+    static GLfloat redgear[4] = {0.8, 0.1, 0.0, 1.0 };
+    static GLfloat greengear[4] = {0.0, 0.8, 0.2, 1.0 };
+    static GLfloat bluegear[4] = {0.2, 0.2, 1.0, 1.0 };
+
+    glLightfv( GL_LIGHT0, GL_POSITION, pos );
+    glEnable( GL_CULL_FACE );
+    glEnable( GL_LIGHTING );
+    glEnable( GL_LIGHT0 );
+    glEnable( GL_DEPTH_TEST );
+
+    /* make the gears */
+    gear1 = glGenLists(1);
+    glNewList(gear1, GL_COMPILE);
+    glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, redgear );
+    gear( 1.0, 4.0, 1.0, 20, 0.7 );
+    glEndList();
+
+    gear2 = glGenLists(1);
+    glNewList(gear2, GL_COMPILE);
+    glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, greengear );
+    gear( 0.5, 2.0, 2.0, 10, 0.7 );
+    glEndList();
+
+    gear3 = glGenLists(1);
+    glNewList(gear3, GL_COMPILE);
+    glMaterialfv( GL_FRONT, GL_AMBIENT_AND_DIFFUSE, bluegear );
+    gear( 1.3, 2.0, 0.5, 10, 0.7 );
+    glEndList();
+
+    glEnable( GL_NORMALIZE );
+}
+
+
+void GearWidget::resizeGL( int width, int height )
+{
+    GLfloat w = (float) width / (float) height;
+    GLfloat h = 1.0;
+
+    glViewport( 0, 0, width, height );
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glFrustum( -w, w, -h, h, 5.0, 60.0 );
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glTranslatef( 0.0, 0.0, -40.0 );
+}
+
+
+void GearWidget::paintGL()
+{
+    qDebug( "GearWidget: Doing GL rendering." );
+#if defined (Q_GLX)
+    static bool doneIt = FALSE;
+    if ( !doneIt ) {
+	doneIt = TRUE;
+	// Print out the Visual ID. Access to this will be made
+	// simpler in future versions of Qt!
+	XWindowAttributes a;
+	XGetWindowAttributes( x11Display(), winId(), &a );
+	qDebug( "QGLWidget: using Visual ID: 0x%x.",
+	       (int)XVisualIDFromVisual( a.visual ) );
+    }
+#endif
+    draw();
+}
+
-- 
cgit v1.2.3