ScreenImage Class Reference

Public Member Functions
	ScreenImage (const QString &filename, qreal x, qreal y, bool show=false, qreal scale=1., qreal alpha=1., float fadeDuration=1.)
	Load an image. More...
virtual bool	draw (const StelCore *core)
	Draw the image. More...
virtual void	update (double deltaTime)
	Empty dummy. The various animations are updated by other means.
virtual void	setFadeDuration (float duration)
	Set the duration used for the fade in / fade out of the image.
virtual void	setFlagShow (bool b)
	Show or hide the image (it will fade in/out) More...
virtual bool	getFlagShow (void) const
	Get the display status of the image.
virtual void	setAlpha (qreal a)
	Set the image alpha for when it is in full "on" (after fade in). More...
virtual void	setXY (qreal x, qreal y, float duration=0.)
	Set the x, y position of the image. More...
virtual void	addXY (qreal x, qreal y, float duration=0.)
	Set the x, y position of the image relative to the current position. More...
virtual int	imageHeight (void) const
virtual int	imageWidth (void) const
virtual void	setScale (qreal scale)
	Set the image scale relative to the size originally loaded. More...
virtual void	setScale (qreal scaleX, qreal scaleY, float duration=0.)
	Set the image scale relative to the size originally loaded. More...
virtual qreal	imageScaleX (void) const
virtual qreal	imageScaleY (void) const

Protected Attributes
QGraphicsPixmapItem *	tex
QTimeLine *	moveTimer
QTimeLine *	fadeTimer
QTimeLine *	scaleTimer
QGraphicsItemAnimation *	anim
QGraphicsItemAnimation *	scaleAnim

Constructor & Destructor Documentation

ScreenImage()

ScreenImage::ScreenImage	(	const QString &	filename,
		qreal	x,
		qreal	y,
		bool	show = false,
		qreal	scale = 1.,
		qreal	alpha = 1.,
		float	fadeDuration = 1.
	)

Load an image.

Parameters

filename	the partial path of the file to load. This will be searched for in the scripts directory using StelFileMgr.
x	the screen x-position for the texture (in pixels), measured from the left side of the screen.
y	the screen x-position for the texture (in pixels), measured from the top of the screen.
show	the initial display status of the image (false == hidden).
scale	scale factor for the image. 1 = original size, 0.5 = 50% size etc. Note that this also controls the final resolution of the image! Scale smaller that 1 leads to reduced resolution, larger than 1 of course creates upsampling artifacts. The scaling that happens after loading is a simple stretch of this loaded pixmap. In order to get a small image on screen which you might want to grow later, load with this scale=1 and setScale() later.
fadeDuration	the time it takes for screen images to fade in/out/change alpha in seconds.

Member Function Documentation

addXY()

virtual void ScreenImage::addXY ( qreal  x, qreal  y, float  duration = 0.  )

virtual

Set the x, y position of the image relative to the current position.

Parameters

x	the offset in the x-axis
y	the offset in the y-axis
duration	how long for the movement to take in seconds

draw()

virtual bool ScreenImage::draw ( const StelCore *  core )

virtual

Draw the image.

Parameters

core	the StelCore object

setAlpha()

virtual void ScreenImage::setAlpha ( qreal  a )

virtual

Set the image alpha for when it is in full "on" (after fade in).

Parameters

a	the new alpha (transparency) for the image. 1.0 = totally transparent, 0.0 = fully opaque.
duration	the time for the change in alpha to take effect.

setFlagShow()

virtual void ScreenImage::setFlagShow ( bool  b )

virtual

Show or hide the image (it will fade in/out)

Parameters

b	if true, the image will be shown, else it will be hidden

setScale() [1/2]

virtual void ScreenImage::setScale ( qreal  scale )

virtual

Set the image scale relative to the size originally loaded.

Parameters

scale

new (target) horizontal and vertical scale factor. Native size=1.

setScale() [2/2]

virtual void ScreenImage::setScale ( qreal  scaleX, qreal  scaleY, float  duration = 0.  )

virtual

Set the image scale relative to the size originally loaded.

Parameters

scaleX	new (target) horizontal scale factor. Native size=1.
scaleY	new (target) vertical scale factor. Native size=1.
duration	how long for the resize to take in seconds

setXY()

virtual void ScreenImage::setXY ( qreal  x, qreal  y, float  duration = 0.  )

virtual

Set the x, y position of the image.

Parameters

x	new x position
y	new y position
duration	how long for the movement to take in seconds