TiledImage

touchgfx/widgets/TiledImage.hpp

Simple widget capable of showing a bitmap tiled indefinitely horizontally and vertically. This means that when the TiledImageWidget is larger than the provided Bitmap, the Bitmap is repeated over and over horizontally and vertically. The bitmap can be alpha- blended with the background and have areas of transparency.

Inherits from: Image, Widget, Drawable

Public Functions

virtual void	draw(const Rect & invalidatedArea) const
	Draw this drawable.
virtual void	getOffset(int16_t & x, int16_t & y)
	Gets the offset into the bitmap where the tile drawing should start.
virtual Rect	getSolidRect() const
	Get (the largest possible) rectangle that is guaranteed to be solid (opaque).
virtual int16_t	getXOffset()
	Get x offset.
virtual int16_t	getYOffset()
	Get y coordinate offset.
virtual void	setBitmap(const Bitmap & bmp)
	Sets the bitmap for this Image and updates the width and height of this widget to match those of the Bitmap.
virtual void	setOffset(int16_t x, int16_t y)
	Sets an offset into the bitmap where the tile drawing should start.
virtual void	setXOffset(int16_t x)
	Sets x offset into the bitmap where the tile drawing should start.
virtual void	setYOffset(int16_t y)
	Sets y offset into the bitmap where the tile drawing should start.
	TiledImage(const Bitmap & bmp =Bitmap())
	Constructs a new TiledImage with a default alpha value of 255 (solid) and a default Bitmap (undefined) if none is specified.

Protected Attributes

int16_t	xOffset
	The X offset into the bitmap to start drawing in range 0..bitmap.width-1.
int16_t	yOffset
	The Y offset into the bitmap to start drawing in range 0..bitmap.height-1.

Additional inherited members

Public Functions inherited from Image

uint8_t	getAlpha() const
	Gets the current alpha value of the widget.
Bitmap	getBitmap() const
	Gets the Bitmap currently assigned to the Image widget.
BitmapId	getBitmapId() const
	Gets the BitmapId currently assigned to the Image widget.
	Image(const Bitmap & bmp =Bitmap())
	Constructs a new Image with a default alpha value of 255 (solid) and a default Bitmap (undefined) if none is specified.
virtual void	invalidateContent() const
	Tell the framework that the contents of the Drawable needs to be redrawn.
void	setAlpha(uint8_t newAlpha)
	Sets the opacity (alpha value).

Protected Attributes inherited from Image

uint8_t	alpha
	The Alpha for this image.
Bitmap	bitmap
	The Bitmap to display.

Public Functions inherited from Widget

virtual void	getLastChild(int16_t , int16_t , Drawable ** last)
	Since a Widget is only one Drawable, Widget::getLastChild simply yields itself as result, but only if the Widget isVisible and isTouchable.

Public Functions inherited from Drawable

void	center()
	Centers the Drawable inside its parent.
void	centerX()
	Center the Drawable horizontally inside its parent.
void	centerY()
	Center the Drawable vertically inside its parent.
virtual void	childGeometryChanged()
	This function can be called on parent nodes to signal that the size or position of one or more of its children has changed.
	Drawable()
	Initializes a new instance of the Drawable class.
void	drawToDynamicBitmap(BitmapId id)
	Render the Drawable object into a dynamic bitmap.
void	expand(int margin =0)
	Expands the Drawable to have the same size as its parent with a given margin around the edge.
Rect	getAbsoluteRect() const
	Helper function for obtaining the rectangle this Drawable covers, expressed in absolute coordinates.
virtual Drawable *	getFirstChild()
	Function for obtaining the first child of this drawable if any.
int16_t	getHeight() const
	Gets the height of this Drawable.
virtual void	getLastChild(int16_t x, int16_t y, Drawable ** last) =0
	Function for obtaining the the last child of this drawable that intersects with the specified point.
Drawable *	getNextSibling()
	Gets the next sibling node.
Drawable *	getParent() const
	Returns the parent node.
const Rect &	getRect() const
	Gets the rectangle this Drawable covers, in coordinates relative to its parent.
virtual Rect	getSolidRectAbsolute()
	Helper function for obtaining the largest solid rect (as implemented by getSolidRect()) expressed in absolute coordinates.
virtual void	getVisibleRect(Rect & rect) const
	Function for finding the visible part of this drawable.
int16_t	getWidth() const
	Gets the width of this Drawable.
int16_t	getX() const
	Gets the x coordinate of this Drawable, relative to its parent.
int16_t	getY() const
	Gets the y coordinate of this Drawable, relative to its parent.
virtual void	handleClickEvent(const ClickEvent & event)
	Defines the event handler interface for ClickEvents.
virtual void	handleDragEvent(const DragEvent & event)
	Defines the event handler interface for DragEvents.
virtual void	handleGestureEvent(const GestureEvent & event)
	Defines the event handler interface for GestureEvents.
virtual void	handleTickEvent()
	Called periodically by the framework if the Drawable instance has subscribed to timer ticks.
virtual void	invalidate() const
	Tell the framework that this entire Drawable needs to be redrawn.
virtual void	invalidateContent() const
	Tell the framework that the contents of the Drawable needs to be redrawn.
virtual void	invalidateRect(Rect & invalidatedArea) const
	Request that a region of this drawable is redrawn.
bool	isTouchable() const
	Gets whether this Drawable receives touch events or not.
bool	isVisible() const
	Gets whether this Drawable is visible.
virtual void	moveRelative(int16_t x, int16_t y)
	Moves the drawable.
virtual void	moveTo(int16_t x, int16_t y)
	Moves the drawable.
virtual void	setHeight(int16_t height)
	Sets the height of this drawable.
void	setPosition(const Drawable & drawable)
	Sets the position of the Drawable to the same as the given Drawable.
void	setPosition(int16_t x, int16_t y, int16_t width, int16_t height)
	Sets the size and position of this Drawable, relative to its parent.
void	setTouchable(bool touch)
	Controls whether this Drawable receives touch events or not.
void	setVisible(bool vis)
	Controls whether this Drawable should be visible.
virtual void	setWidth(int16_t width)
	Sets the width of this drawable.
void	setWidthHeight(const Bitmap & bitmap)
	Sets the dimensions (width and height) of the Drawable without changing the x and y coordinates).
void	setWidthHeight(const Drawable & drawable)
	Sets the dimensions (width and height) of the Drawable without changing the x and y coordinates).
void	setWidthHeight(const Rect & other)
	Sets the dimensions (width and height) of the Drawable without changing the x and y coordinates).
void	setWidthHeight(int16_t width, int16_t height)
	Sets the dimensions (width and height) of the Drawable without changing the x and y coordinates).
virtual void	setX(int16_t x)
	Sets the x coordinate of this Drawable, relative to its parent.
void	setXY(const Drawable & drawable)
	Sets the x and y coordinates of this Drawable.
void	setXY(int16_t x, int16_t y)
	Sets the x and y coordinates of this Drawable, relative to its parent.
virtual void	setY(int16_t y)
	Sets the y coordinate of this Drawable, relative to its parent.
virtual void	translateRectToAbsolute(Rect & r) const
	Helper function for converting a region of this Drawable to absolute coordinates.
virtual	~Drawable()
	Finalizes an instance of the Drawable class.

Protected Attributes inherited from Drawable

Drawable *	nextSibling
	Pointer to the next Drawable.
Drawable *	parent
	Pointer to this drawable's parent.
Rect	rect
	The coordinates of this Drawable, relative to its parent.
bool	touchable
	True if this drawable should receive touch events.
bool	visible
	True if this drawable should be drawn.

Public Functions Documentation

draw

virtual void draw	(	const Rect &	invalidatedArea	)

Draw this drawable.

It is a requirement that the draw implementation does not draw outside the region specified by invalidatedArea.

Parameters:

invalidatedArea	The sub-region of this drawable that needs to be redrawn, expressed in coordinates relative to its parent (e.g. for a complete redraw, invalidatedArea will be (0, 0, width, height).

Reimplements: touchgfx::Image::draw

getOffset

virtual void getOffset	(	int16_t &	x ,
		int16_t &	y
		)

Gets the offset into the bitmap where the tile drawing should start.

Please note that the offsets set using setOffset have been normalized so that x is in the range 0 to bitmap width - 1, and y is in the range 0 to bitmap height - 1.

Parameters:

x	The x offset.
y	The y offset.

See also:

getXOffset, getYOffset

getSolidRect

virtual Rect getSolidRect	(			)	const

Get (the largest possible) rectangle that is guaranteed to be solid (opaque).

This information is important, as any Drawable underneath the solid area does not need to be drawn.

Returns:

The solid rectangle part of the Drawable.

Note

The rectangle returned must be relative to upper left corner of the Drawable, meaning that a completely solid widget should return the full size Rect(0, 0, getWidth(), getHeight()). If no area can be guaranteed to be solid, an empty Rect must be returned. Failing to return the correct rectangle may result in errors on the display.

Reimplements: touchgfx::Image::getSolidRect

getXOffset

virtual int16_t getXOffset	(			)

Get x offset.

This is the value set using setXOffset() (or setOffset()) normalized to be in the range 0 to bitmap width - 1.

Returns:

The x offset.

See also:

getYOffset, getOffset

getYOffset

virtual int16_t getYOffset	(			)

Get y coordinate offset.

This is the value set using setYOffset() (or setOffset()) normalized to be in the range 0 to bitmap height - 1.

Returns:

The y offset.

See also:

getXOffset, getOffset

setBitmap

virtual void setBitmap	(	const Bitmap &	bmp	)

Sets the bitmap for this Image and updates the width and height of this widget to match those of the Bitmap.

Parameters:

bmp	The bitmap instance.

Note

The user code must call invalidate() in order to update the image on the display.

Reimplements: touchgfx::Image::setBitmap

setOffset

virtual void setOffset	(	int16_t	x ,
		int16_t	y
		)

Sets an offset into the bitmap where the tile drawing should start.

By default the first image is aligned along the top and left, i.e. offset at (0, 0).

Parameters:

x	The x coordinate offset.
y	The y coordinate offset.

See also:

setXOffset, setYOffset

setXOffset

virtual void setXOffset	(	int16_t	x	)

Sets x offset into the bitmap where the tile drawing should start.

Setting the x offset to 1 will push all images one pixel to the left.

Parameters:

x	The x offset.

See also:

setYOffset, setOffset

setYOffset

virtual void setYOffset	(	int16_t	y	)

Sets y offset into the bitmap where the tile drawing should start.

Setting the y offset to 1 will push all images one pixel up.

Parameters:

y	The y offset.

See also:

setXOffset, setOffset

TiledImage

TiledImage	(	const Bitmap &	bmp =Bitmap()	)

Constructs a new TiledImage with a default alpha value of 255 (solid) and a default Bitmap (undefined) if none is specified.

If a Bitmap is passed to the constructor, the width and height of this widget is set to those of the bitmap.

Parameters:

bmp	(Optional) The bitmap to display.

See also:

setBitmap

Protected Attributes Documentation

xOffset

int16_t xOffset

The X offset into the bitmap to start drawing in range 0..bitmap.width-1.

yOffset

int16_t yOffset

The Y offset into the bitmap to start drawing in range 0..bitmap.height-1.