QOpenGLTessellator Class Reference

Inheritance diagram for QOpenGLTessellator:

Public Functions
	QOpenGLTessellator ()
QGLTrapezoid	toGLTrapezoid (const Trapezoid &trap)
	~QOpenGLTessellator ()
Public Functions inherited from QTessellator
virtual void	addTrap (const Trapezoid &trap)=0
	QTessellator ()
void	setWinding (bool w)
QRectF	tessellate (const QPointF *points, int nPoints)
void	tessellateConvex (const QPointF *points, int nPoints)
void	tessellateRect (const QPointF &a, const QPointF &b, qreal width)
virtual	~QTessellator ()

Detailed Description

Definition at line 1674 of file qpaintengine_opengl.cpp.

Constructors and Destructors

QOpenGLTessellator()

QOpenGLTessellator::QOpenGLTessellator ( )

inline

Definition at line 1677 of file qpaintengine_opengl.cpp.

{}

~QOpenGLTessellator()

QOpenGLTessellator::~QOpenGLTessellator ( )

inline

Definition at line 1678 of file qpaintengine_opengl.cpp.

{ }

Functions

toGLTrapezoid()

QGLTrapezoid QOpenGLTessellator::toGLTrapezoid

(

const Trapezoid &

trap

)

Definition at line 1682 of file qpaintengine_opengl.cpp.

{
    QGLTrapezoid t;

    t.top = Q27Dot5ToDouble(trap.top);
    t.bottom = Q27Dot5ToDouble(trap.bottom);

    Q27Dot5 y = trap.topLeft->y - trap.bottomLeft->y;

    qreal topLeftY = Q27Dot5ToDouble(trap.topLeft->y);

    qreal tx = Q27Dot5ToDouble(trap.topLeft->x);
    qreal m = (-tx + Q27Dot5ToDouble(trap.bottomLeft->x)) / Q27Dot5ToDouble(y);
    t.topLeftX = tx + m * (topLeftY - t.top);
    t.bottomLeftX = tx + m * (topLeftY - t.bottom);

    y = trap.topRight->y - trap.bottomRight->y;

    qreal topRightY = Q27Dot5ToDouble(trap.topRight->y);

    tx = Q27Dot5ToDouble(trap.topRight->x);
    m = (-tx + Q27Dot5ToDouble(trap.bottomRight->x)) / Q27Dot5ToDouble(y);

    t.topRightX = tx + m * (topRightY - Q27Dot5ToDouble(trap.top));
    t.bottomRightX = tx + m * (topRightY - Q27Dot5ToDouble(trap.bottom));

    return t;
}

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The documentation for this class was generated from the following file:

• /src/opengl/qpaintengine_opengl.cpp