Viewport Class Reference

Handles coordinaive transforation between grids (based on real-world metric coordinates). More...

#include <viewport.h>

Public Member Functions
	Viewport ()
	Viewport (const QRectF worldrect, const QRect screenrect)
const QPointF	toWorld (const QPoint pixel)
	toWorld() converts the pixel-information (e.g. by an mouse event) to the corresponding real world coordinates (defined by viewport). More...
const QPoint	toScreen (const QPointF p)
	toScreen() converts world coordinates in screen coordinates using the defined viewport. More...
const QRect	toScreen (const QRectF world)
const QRectF	viewRect () const
bool	isVisible (const QPointF &world_coord) const
bool	isVisible (const QRectF &world_rect) const
void	zoomToAll ()
	show the full extent of the world. More...
void	zoomTo (const QPoint &screen_point, const double factor)
	zoom using a factor of factor. More...
void	moveTo (const QPoint &screen_from, const QPoint &screen_to)
	move the viewport. screen_from and screen_to give mouse positions (in pixel) from dragging the mouse. More...
void	setViewPoint (const QPointF &world_center, const double px_per_meter)
	set 'world_center' as the new center point of the viewport More...
double	pixelToMeter (const int pixel)
int	meterToPixel (const double meter)
void	setViewRect (const QRectF &viewrect)
void	setWorldRect (const QRectF &worldrect)
void	setScreenRect (const QRect &viewrect)
	sets the screen rect; this also modifies the viewport. More...

Detailed Description

Handles coordinaive transforation between grids (based on real-world metric coordinates).

The visible part of the grid is defined by the "viewport" (defaults to 100% of the grid). The result coordinates are mapped into a "ScreenRect", which is a pixel-based viewing window.

Constructor & Destructor Documentation

Viewport() [1/2]

Viewport::Viewport ( )

inline

Viewport() [2/2]

Viewport::Viewport ( const QRectF  worldrect, const QRect  screenrect  )

inline

Member Function Documentation

isVisible() [1/2]

bool Viewport::isVisible

(

const QPointF &

world_coord

)

const

isVisible() [2/2]

bool Viewport::isVisible

(

const QRectF &

world_rect

)

const

meterToPixel()

int Viewport::meterToPixel ( const double  meter )

inline

moveTo()

void Viewport::moveTo	(	const QPoint &	screen_from,
		const QPoint &	screen_to
	)

move the viewport. screen_from and screen_to give mouse positions (in pixel) from dragging the mouse.

pixelToMeter()

double Viewport::pixelToMeter ( const int  pixel )

inline

setScreenRect()

void Viewport::setScreenRect

(

const QRect &

viewrect

)

sets the screen rect; this also modifies the viewport.

setViewPoint()

void Viewport::setViewPoint	(	const QPointF &	world_center,
		const double	px_per_meter
	)

set 'world_center' as the new center point of the viewport

setViewRect()

void Viewport::setViewRect ( const QRectF &  viewrect )

inline

setWorldRect()

void Viewport::setWorldRect ( const QRectF &  worldrect )

inline

toScreen() [1/2]

const QPoint Viewport::toScreen

(

const QPointF

p

)

toScreen() converts world coordinates in screen coordinates using the defined viewport.

toScreen() [2/2]

const QRect Viewport::toScreen ( const QRectF  world )

inline

toWorld()

const QPointF Viewport::toWorld

(

const QPoint

pixel

)

toWorld() converts the pixel-information (e.g. by an mouse event) to the corresponding real world coordinates (defined by viewport).

viewRect()

const QRectF Viewport::viewRect ( ) const

inline

zoomTo()

void Viewport::zoomTo	(	const QPoint &	screen_point,
		const double	factor
	)

zoom using a factor of factor.

Values > 1 means zoom out, < 1 zoom in. (factor=1 would have no effect). after zooming, the world-point under the mouse screen_point is still under the mouse.

zoomToAll()

void Viewport::zoomToAll

(

)

show the full extent of the world.

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

• C:/dev/iland/src/tools/viewport.h
• C:/dev/iland/src/tools/viewport.cpp