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=begin
**
** Copyright (C) 2004-2005 Trolltech AS. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file. Please review the following information to ensure GNU
** General Public Licensing requirements will be met:
** http://www.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at sales@trolltech.com.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** Translated to QtRuby by Richard Dale
=end
require 'opengl'
include Math
class GLWidget < Qt::GLWidget
slots 'setXRotation(int)',
'setYRotation(int)',
'setZRotation(int)'
signals 'xRotationChanged(int)',
'yRotationChanged(int)',
'zRotationChanged(int)'
slots 'advanceGears()'
def initialize(parent = nil)
super(parent)
@xRot = 0
@yRot = 0
@zRot = 0
@gear1Rot = 0
@lastPos = Qt::Point.new
timer = Qt::Timer.new(self)
connect(timer, SIGNAL('timeout()'), self, SLOT('advanceGears()'))
timer.start(20)
end
def xRotation() return @xRot end
def yRotation() return @yRot end
def zRotation() return @zRot end
def dispose()
makeCurrent()
GL.DeleteLists(@gear1, 1)
GL.DeleteLists(@gear2, 1)
GL.DeleteLists(@gear3, 1)
super
end
def setXRotation(angle)
angle = normalizeAngle(angle)
if angle != @xRot
@xRot = angle
emit xRotationChanged(angle)
updateGL()
end
end
def setYRotation(angle)
angle = normalizeAngle(angle)
if angle != @yRot
@yRot = angle
emit yRotationChanged(angle)
updateGL()
end
end
def setZRotation(angle)
angle = normalizeAngle(angle)
if angle != @zRot
@zRot = angle
emit zRotationChanged(angle)
updateGL()
end
end
def initializeGL
lightPos = [ 5.0, 5.0, 10.0, 1.0 ]
reflectance1 = [ 0.8, 0.1, 0.0, 1.0 ]
reflectance2 = [ 0.0, 0.8, 0.2, 1.0 ]
reflectance3 = [ 0.2, 0.2, 1.0, 1.0 ]
GL.Lightfv(GL::LIGHT0, GL::POSITION, lightPos)
GL.Enable(GL::LIGHTING)
GL.Enable(GL::LIGHT0)
GL.Enable(GL::DEPTH_TEST)
@gear1 = makeGear(reflectance1, 1.0, 4.0, 1.0, 0.7, 20)
@gear2 = makeGear(reflectance2, 0.5, 2.0, 2.0, 0.7, 10)
@gear3 = makeGear(reflectance3, 1.3, 2.0, 0.5, 0.7, 10)
GL.Enable(GL::NORMALIZE)
end
def paintGL()
GL.Clear(GL::COLOR_BUFFER_BIT | GL::DEPTH_BUFFER_BIT)
GL.PushMatrix
GL.Rotated(@xRot / 16.0, 1.0, 0.0, 0.0)
GL.Rotated(@yRot / 16.0, 0.0, 1.0, 0.0)
GL.Rotated(@zRot / 16.0, 0.0, 0.0, 1.0)
drawGear(@gear1, -3.0, -2.0, 0.0, @gear1Rot / 16.0)
drawGear(@gear2, +3.1, -2.0, 0.0, -2.0 * (@gear1Rot / 16.0) - 9.0)
GL.Rotated(+90.0, 1.0, 0.0, 0.0)
drawGear(@gear3, -3.1, -1.8, -2.2, +2.0 * (@gear1Rot / 16.0) - 2.0)
GL.PopMatrix
end
def resizeGL(width, height)
side = [width, height].min
GL.Viewport((width - side) / 2, (height - side) / 2, side, side)
GL.MatrixMode(GL::PROJECTION)
GL.LoadIdentity
GL.Frustum(-1.0, +1.0, -1.0, 1.0, 5.0, 60.0)
GL.MatrixMode(GL::MODELVIEW)
GL.LoadIdentity
GL.Translated(0.0, 0.0, -40.0)
end
def mousePressEvent(event)
@lastPos = event.pos
end
def mouseMoveEvent(event)
dx = event.x - @lastPos.x
dy = event.y - @lastPos.y
if event.buttons & Qt::LeftButton.to_i != 0
setXRotation(@xRot + 8 * dy)
setYRotation(@yRot + 8 * dx)
elsif event.buttons & Qt::RightButton.to_i != 0
setXRotation(@xRot + 8 * dy)
setZRotation(@zRot + 8 * dx)
end
@lastPos = event.pos
end
def advanceGears
@gear1Rot += 2 * 16
updateGL()
end
def makeGear(reflectance, innerRadius,
outerRadius, thickness,
toothSize, toothCount)
list = GL.GenLists(1)
GL.NewList(list, GL::COMPILE)
GL.Material(GL::FRONT, GL::AMBIENT_AND_DIFFUSE, reflectance)
r0 = innerRadius
r1 = outerRadius - toothSize / 2.0
r2 = outerRadius + toothSize / 2.0
delta = (2.0 * PI / toothCount) / 4.0
z = thickness / 2.0
GL.ShadeModel(GL::FLAT)
for i in 0...2
sign = (i == 0) ? +1.0 : -1.0
GL.Normal3d(0.0, 0.0, sign)
GL.Begin(GL::QUAD_STRIP)
for j in 0..toothCount
angle = 2.0 * PI * j / toothCount
GL.Vertex3d(r0 * cos(angle), r0 * sin(angle), sign * z)
GL.Vertex3d(r1 * cos(angle), r1 * sin(angle), sign * z)
GL.Vertex3d(r0 * cos(angle), r0 * sin(angle), sign * z)
GL.Vertex3d(r1 * cos(angle + 3 * delta), r1 * sin(angle + 3 * delta),
sign * z)
end
GL.End
GL.Begin(GL::QUADS)
for j in 0...toothCount
angle = 2.0 * PI * j / toothCount
GL.Vertex3d(r1 * cos(angle), r1 * sin(angle), sign * z)
GL.Vertex3d(r2 * cos(angle + delta), r2 * sin(angle + delta),
sign * z)
GL.Vertex3d(r2 * cos(angle + 2 * delta), r2 * sin(angle + 2 * delta),
sign * z)
GL.Vertex3d(r1 * cos(angle + 3 * delta), r1 * sin(angle + 3 * delta),
sign * z)
end
GL.End
end
GL.Begin(GL::QUAD_STRIP)
for i in 0...toothCount
for j in 0...2
angle = 2.0 * PI * (i + (j / 2.0)) / toothCount
s1 = r1
s2 = r2
if j == 1
s1, s2 = s2, s1
end
GL.Normal3d(cos(angle), sin(angle), 0.0)
GL.Vertex3d(s1 * cos(angle), s1 * sin(angle), +z)
GL.Vertex3d(s1 * cos(angle), s1 * sin(angle), -z)
GL.Normal3d(s2 * sin(angle + delta) - s1 * sin(angle),
s1 * cos(angle) - s2 * cos(angle + delta), 0.0)
GL.Vertex3d(s2 * cos(angle + delta), s2 * sin(angle + delta), +z)
GL.Vertex3d(s2 * cos(angle + delta), s2 * sin(angle + delta), -z)
end
end
GL.Vertex3d(r1, 0.0, +z)
GL.Vertex3d(r1, 0.0, -z)
GL.End
GL.ShadeModel(GL::SMOOTH)
GL.Begin(GL::QUAD_STRIP)
for i in 0..toothCount
angle = i * 2.0 * PI / toothCount
GL.Normal3d(-cos(angle), -sin(angle), 0.0)
GL.Vertex3d(r0 * cos(angle), r0 * sin(angle), +z)
GL.Vertex3d(r0 * cos(angle), r0 * sin(angle), -z)
end
GL.End
GL.EndList
return list
end
def drawGear(gear, dx, dy, dz, angle)
GL.PushMatrix
GL.Translated(dx, dy, dz)
GL.Rotated(angle, 0.0, 0.0, 1.0)
GL.CallList(gear)
GL.PopMatrix
end
def normalizeAngle(angle)
while angle < 0 do
angle += 360 * 16
end
while angle > 360 * 16 do
angle -= 360 * 16
end
return angle
end
end
|
