Scaling Class Reference

#include <Pt/Gfx/Scaling.h>

Conversion between logical units and pixels. More...

Public Member Functions
	Scaling (double scaleFactor=1.0)
	Constructs a scaling with the given factor.
double	scaleFactor () const
	Returns the scale factor.
void	setScaleFactor (double scaleFactor)
	Sets the scale factor.
double	toPhysical (double n) const
	Converts a scalar value to physical units.
Gfx::PointF	toPhysical (const Gfx::PointF &p) const
	Converts a point to physical units.
Gfx::SizeF	toPhysical (const Gfx::SizeF &s) const
	Converts a size to physical units.
Gfx::RectF	toPhysical (const Gfx::RectF &r) const
	Converts a rectangle to physical units.
double	toLogical (double n) const
	Converts a scalar value to logical units.
Gfx::PointF	toLogical (const Gfx::PointF &p) const
	Converts a point to logical units.
Gfx::SizeF	toLogical (const Gfx::SizeF &s) const
	Converts a size to logical units.
Gfx::RectF	toLogical (const Gfx::RectF &r) const
	Converts a rectangle to logical units.
double	align (double n) const
	Aligns a scalar value to the nearest physical pixel.
double	alignPixel (double n) const
	Aligns a scalar value to a pixel center.
double	alignContour (size_t n) const
	Aligns a contour width while preserving visible thickness.
Gfx::PointF	align (const Gfx::PointF &p) const
	Aligns a point to physical pixels.
Gfx::SizeF	align (const Gfx::SizeF &s) const
	Aligns a size to physical pixels.
Gfx::RectF	align (const Gfx::RectF &rect) const
	Aligns a rectangle to physical pixels.

Related Symbols
(Note that these are not member symbols.)
bool	operator== (const Scaling &a, const Scaling &b)
	Returns true if both scalings are equal.
bool	operator!= (const Scaling &a, const Scaling &b)
	Returns true if both scalings are different.
bool	operator< (const Scaling &a, const Scaling &b)
	Returns true if one scaling sorts before another.

Detailed Description

Scaling is the factor a PaintSurface uses to map logical drawing coordinates to physical pixels. toPhysical() multiplies by that factor. toLogical() divides. Alignment helpers snap geometry to pixel boundaries. A painter reads scaling from the target; set it on a Bitmap with setScaleFactor().