Class: Canvas

Inherits:
Qt::GLWidget show all
Defined in:
ext/ruby/qtruby/examples/ruboids/ruboids/Canvas.rb

Constant Summary collapse

GRASS_COLOR = 
[0, 0.75, 0]
MDA_ROTATE = 
:MDA_ROTATE
MDA_ZOOM = 
:MDA_ZOOM
MDA_CHANGE_FOCUS = 
:MDA_CHANGE_FOCUS

Instance Method Summary collapse

Methods inherited from Qt::GLWidget

#format

Methods inherited from Qt::Base

#%, #&, #*, #**, #+, #-, #-@, #/, #<, #<<, #<=, #==, #>, #>=, #>>, #QCOMPARE, #QEXPECT_FAIL, #QFAIL, #QSKIP, #QTEST, #QVERIFY, #QVERIFY2, #QWARN, #^, ancestors, #is_a?, #methods, private_slots, #protected_methods, #public_methods, q_classinfo, q_signal, q_slot, signals, #singleton_methods, slots, #|, #~

Constructor Details

#initialize(parent = nil, name = '') ⇒ Canvas

Returns a new instance of Canvas.



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# File 'ext/ruby/qtruby/examples/ruboids/ruboids/Canvas.rb', line 25

def initialize(parent = nil, name = '')
    super(parent)
    @grassObject = nil
end

Instance Method Details

#initializeGL ⇒ Object 



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# File 'ext/ruby/qtruby/examples/ruboids/ruboids/Canvas.rb', line 34

def initializeGL()
    ClearColor(0.4, 0.4, 1.0, 0.0) # Let OpenGL clear to light blue
    @grassObject = makeGrassObject()
    ShadeModel(FLAT)
end

#makeGrassObject ⇒ Object 



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# File 'ext/ruby/qtruby/examples/ruboids/ruboids/Canvas.rb', line 81

def makeGrassObject
    halfXSize = $PARAMS['world_width']
    halfYSize = $PARAMS['world_depth'] / 2
    halfZSize = $PARAMS['world_height']

    list = GenLists(1)
    NewList(list, COMPILE)
    LineWidth(2.0)
    Begin(QUADS)

    Color(GRASS_COLOR)
    # Counter-clockwise
    Vertex( halfXSize, -halfYSize,  halfZSize)
    Vertex(-halfXSize, -halfYSize,  halfZSize)
    Vertex(-halfXSize, -halfYSize, -halfZSize)
    Vertex( halfXSize, -halfYSize, -halfZSize)

    End()
    EndList()
    return list
end

#mouseMoveEvent(e) ⇒ Object

Rotate around sphere with right (#2) button. Zoom with left button. Change focus with left button.



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# File 'ext/ruby/qtruby/examples/ruboids/ruboids/Canvas.rb', line 117

def mouseMoveEvent(e)
    return if @mouseLoc.nil?

    dx = dy = 0
    if e.x() != @mouseLoc.x()
        dx = e.x() - @mouseLoc.x() # move right increases dx
        @mouseLoc.setX(e.x())
    end
    if e.y() != @mouseLoc.y()
        dy = @mouseLoc.y() - e.y() # move up increases dy
        @mouseLoc.setY(e.y())
    end

    return if dx == 0 && dy == 0

    case @mouseDragAction
    when MDA_ZOOM
        return if (dy == 0)
        World.instance.camera.zoom += 0.1 * -dy
    when MDA_ROTATE
        break
    when MDA_CHANGE_FOCUS
        break
    end
    World.instance.setupTranslation()
end

#mousePressEvent(e) ⇒ Object 



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# File 'ext/ruby/qtruby/examples/ruboids/ruboids/Canvas.rb', line 103

def mousePressEvent(e)
    @mouseLoc = e.pos()
    case e.button()
    when Qt::LeftButton
        @mouseDragAction = MDA_ZOOM
    when Qt::RightButton
        @mouseDragAction = MDA_ROTATE
    when Qt::MidButton
        @mouseDragAction = MDA_CHANGE_FOCUS
    end
end

#paintGL ⇒ Object 



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# File 'ext/ruby/qtruby/examples/ruboids/ruboids/Canvas.rb', line 40

def paintGL()
    Enable(DEPTH_TEST)
    Clear(COLOR_BUFFER_BIT | DEPTH_BUFFER_BIT)

    MatrixMode(MODELVIEW)

    camera = World.instance.camera

    LoadIdentity()
    Rotate(camera.rotation.x, 1, 0, 0)
    Rotate(camera.rotation.y, 0, 1, 0)
    Rotate(camera.rotation.z, 0, 0, 1.0)
    Translate(-camera.position.x, -camera.position.y, -camera.position.z)
    Scale(camera.zoom, camera.zoom, camera.zoom)

    CallList(@grassObject)

    World.instance.clouds.each { | cloud | cloud.draw() }
    World.instance.flock.draw()
end

#resizeGL(w, h) ⇒ Object

Set up the OpenGL view port, matrix mode, etc.



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# File 'ext/ruby/qtruby/examples/ruboids/ruboids/Canvas.rb', line 62

def resizeGL(w, h)
    Viewport(0, 0, w, h)
    MatrixMode(PROJECTION)
    LoadIdentity()

#          # left, right, bottom, top, front, back (focal_length)
    halfXSize = $PARAMS['world_width'] / 2 * 1.25
    halfYSize = $PARAMS['world_height'] / 2 * 1.25
    halfZSize = $PARAMS['world_depth'] / 2 * 1.25

#            Frustum(-halfXSize, halfXSize, -halfYSize, halfYSize,
#                  5, halfZSize * 2)

    Ortho(-halfXSize, halfXSize, -halfYSize, halfYSize,
          -halfZSize, halfZSize)

    MatrixMode(MODELVIEW)
end

#update ⇒ Object 



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# File 'ext/ruby/qtruby/examples/ruboids/ruboids/Canvas.rb', line 30

def update
    updateGL()
end