GraphLabelsX

GraphLabelsX will draw labels along the X axis at given intervals. By combining two GraphLabelsX it is possible to have different appearance for major and minor y offsets.

Inherits from: GraphLabelsBase, AbstractGraphDecoration, AbstractGraphElementNoCWR, AbstractGraphElement, CanvasWidget, Widget, Drawable

Public Functions

virtual void	draw(const Rect & invalidatedArea) const
	Draws the given invalidated area.
virtual void	invalidateGraphPointAt(int16_t index)
	Invalidate the point at the given index.

Protected Functions

void	drawIndexRange(const Rect & invalidatedArea, const Font fontToDraw, const AbstractDataGraph graph, int indexLow, int indexHigh, const uint8_t alpha) const
	Draw labels for all indexes in the given range.
void	drawString(const Rect & invalidatedArea, const Font fontToDraw, const AbstractDataGraph graph, int index, const uint8_t alpha) const
	Draw string using rotation and clipping to make sure it is written properly.

Additional inherited members

Public Functions inherited from GraphLabelsBase

float	getIntervalAsFloat() const
	Gets the interval between each label.
int	getIntervalAsInt() const
	Gets the interval between each label.
Unicode::UnicodeChar	getLabelDecimalPoint() const
	Gets label decimal point previously set.
uint16_t	getLabelDecimals() const
	Gets number of decimals for labels.
TextRotation	getLabelRotation() const
	Gets label rotation.
TypedText	getLabelTypedText() const
	Gets TypedText label.
	GraphLabelsBase()
void	setInterval(float interval)
	Sets the interval between each label.
void	setInterval(int interval)
	Sets the interval between each label.
void	setLabelDecimalPoint(Unicode::UnicodeChar decimalPoint)
	Sets label decimal point.
void	setLabelDecimals(uint16_t decimals)
	Sets number of decimals for labels, default is no decimals and no decimal point.
void	setLabelRotation(TextRotation rotation)
	Sets label rotation.
void	setLabelTypedText(const TypedText & typedText)
	Sets TypedText to use for the label.
void	setMajorLabel(const GraphLabelsBase & major)
	Sets "major" label that will be responsible for drawing major labels.

Protected Functions inherited from GraphLabelsBase

void	formatLabel(Unicode::UnicodeChar * buffer, int16_t bufferSize, int label, int decimals, Unicode::UnicodeChar decimalPoint, int scale) const
	Format label according to the set number of decimals and the decimal point.
int	getCorrectlyScaledMajorInterval(const AbstractDataGraph * graph) const
	Gets correctly scaled major interval, as the major label may have a scale that differs the scale of the graph and this label.
int	getIntervalScaled() const
	Gets the interval between each label.
void	setIntervalScaled(int interval)
	Sets the interval between each label.

Protected Attributes inherited from GraphLabelsBase

Unicode::UnicodeChar	labelDecimalPoint
	The label decimal point character.
uint16_t	labelDecimals
	The number of decimals on the label.
int	labelInterval
	The interval between each label.
TextRotation	labelRotation
	The TextRotation to use for the label.
TypedText	labelTypedText
	The TypedText to use for the label.
const GraphLabelsBase *	majorLabel
	A pointer to a major label, if any.

Public Functions inherited from AbstractGraphElementNoCWR

	AbstractGraphElementNoCWR()
virtual bool	drawCanvasWidget(const Rect & invalidatedArea) const
	Draw canvas widget for the given invalidated area.
virtual colortype	getColor() const
	Gets the color of the graph element.
virtual void	setColor(colortype newColor)
	Sets the color of the graph element.

Protected Functions inherited from AbstractGraphElementNoCWR

void	normalizeRect(Rect & rect) const
	Normalize rectangle by changing a rectangle with negative width or height to a rectangle with positive width or height at the correct position.
virtual void	setPainter(AbstractPainter & painter)
	Protected function to prevent users from setting a painter.

Protected Attributes inherited from AbstractGraphElementNoCWR

colortype	color
	The currently assigned color.

Public Functions inherited from AbstractGraphElement

	AbstractGraphElement()
int	getScale() const
	Gets the scaling factor set using setScale.
void	setScale(int scale)
	Sets a scaling factor to be multiplied on each added element.

Protected Functions inherited from AbstractGraphElement

int	convertToGraphScale(const AbstractDataGraph * graph, int value, int scale) const
	Converts a number with one scale to a number that has the same scale as the graph.
AbstractDataGraph *	getGraph() const
	Gets a pointer to the the graph containing the GraphElement.
int	getGraphRangeYMaxScaled(const AbstractDataGraph * graph) const
	Gets maximum y coordinate for the graph.
int	getGraphRangeYMinScaled(const AbstractDataGraph * graph) const
	Gets minimum y coordinate for the graph.
int	getGraphXAxisOffsetScaled(const AbstractDataGraph * graph) const
	Get x axis offset as a scaled value.
int	getGraphXAxisScaleScaled(const AbstractDataGraph * graph) const
	Get x axis scale as a scaled value.
CWRUtil::Q5	indexToScreenXQ5(const AbstractDataGraph * graph, int16_t index) const
	Gets screen x coordinate for a specific data point added to the graph.
CWRUtil::Q5	indexToScreenYQ5(const AbstractDataGraph * graph, int16_t index) const
	Gets screen y coordinate for a specific data point added to the graph.
bool	isCenterInvisible(const AbstractDataGraph * graph, int16_t index) const
	Query if the center of a given data point index is visible inside the graph area.
Rect	rectAround(CWRUtil::Q5 xQ5, CWRUtil::Q5 yQ5, CWRUtil::Q5 diameterQ5) const
	Find the screen rectangle around a given point with the specified diameter.
Rect	rectFromQ5Coordinates(CWRUtil::Q5 screenXminQ5, CWRUtil::Q5 screenYminQ5, CWRUtil::Q5 screenXmaxQ5, CWRUtil::Q5 screenYmaxQ5) const
	Find the screen rectangle containing the Q5 screen rectangle by rounding the coordinates up/down.
CWRUtil::Q5	roundQ5(CWRUtil::Q5 q5) const
	Round the given CWRUtil::Q5 to the nearest integer and return it as a CWRUtil::Q5 instead of an integer.
CWRUtil::Q5	valueToScreenXQ5(const AbstractDataGraph * graph, int x) const
	Gets graph screen x for x value.
CWRUtil::Q5	valueToScreenYQ5(const AbstractDataGraph * graph, int y) const
	Gets graph screen y for y value.
bool	xScreenRangeToIndexRange(int16_t xLow, int16_t xHigh, int16_t & elementLow, int16_t & elementHigh) const
	Gets graph element range for screen x coordinate range.

Protected Attributes inherited from AbstractGraphElement

int	dataScale
	The scaling factor.

Public Functions inherited from CanvasWidget

	CanvasWidget()
virtual bool	drawCanvasWidget(const Rect & invalidatedArea) const =0
	Draw canvas widget for the given invalidated area.
virtual uint8_t	getAlpha() const
	Gets the current alpha value of the widget.
virtual Rect	getMinimalRect() const
	Gets minimal rectangle containing the shape drawn by this widget.
virtual AbstractPainter &	getPainter() const
	Gets the current painter for the CanvasWidget.
virtual Rect	getSolidRect() const
	Gets the largest solid (non-transparent) rectangle.
virtual void	invalidate() const
	Invalidates the area covered by this CanvasWidget.
void	resetMaxRenderLines()
	Resets the maximum render lines.
virtual void	setAlpha(uint8_t newAlpha)
	Sets the opacity (alpha value).
virtual void	setPainter(AbstractPainter & painter)
	Sets a painter for the CanvasWidget.

Public Functions inherited from Widget

virtual void	getLastChild(int16_t x, int16_t y, 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	getSolidRect() const =0
	Get (the largest possible) rectangle that is guaranteed to be solid (opaque).
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	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 & rect)
	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	)

Draws the given invalidated area.

If the underlying CanvasWidgetRenderer fail to render the widget (if the widget is too complex), the invalidated area is cut into smaller slices (horizontally) which are then drawn separately. If drawing a single raster line fails, that line is considered too complex and skipped (it is left blank/transparent) and drawing continues on the next raster line.

If drawing has failed at least once, which means that the number of horizontal lines draw has been reduced, the number of successfully drawn horizontal lines is remembered for the next invocation of draw(). A future call to draw() would then start off with the reduced number of horizontal lines to prevent potentially drawing the canvas widget in vain, as happened previously in draw().

Parameters:

invalidatedArea	The invalidated area.

Note

Subclasses of CanvasWidget should implement drawCanvasWidget(), not draw(). The term "too complex" means that the size of the buffer (assigned to CanvasWidgetRenderer using CanvasWidgetRenderer::setupBuffer()) is too small.

See also:

drawCanvasWidget

Reimplements: touchgfx::CanvasWidget::draw

invalidateGraphPointAt

virtual void invalidateGraphPointAt	(	int16_t	index	)

Invalidate the point at the given index.

This allows a graph element to only invalidate the minimum rectangle required for the given index. The Graph will call this function before and after changing a point to ensure that both the old and the new area are redrawn (invalidated).

Parameters:

index	Zero-based index of the point.

Reimplements: touchgfx::GraphLabelsBase::invalidateGraphPointAt

Protected Functions Documentation

drawIndexRange

void drawIndexRange	(	const Rect &	invalidatedArea ,		const
		const Font *	fontToDraw ,		const
		const AbstractDataGraph *	graph ,		const
		int	indexLow ,		const
		int	indexHigh ,		const
		const uint8_t	alpha		const
		)	const

Draw labels for all indexes in the given range.

This is used where there is a gap in the graph and the labels have to be drawn using different x scales.

Parameters:

invalidatedArea	The canvas.
fontToDraw	The font to draw.
graph	The graph.
indexLow	The minimum index.
indexHigh	The maximum index.
alpha	The alpha.

drawString

void drawString	(	const Rect &	invalidatedArea ,		const
		const Font *	fontToDraw ,		const
		const AbstractDataGraph *	graph ,		const
		int	index ,		const
		const uint8_t	alpha		const
		)	const

Draw string using rotation and clipping to make sure it is written properly.

Parameters:

invalidatedArea	The invalidated area.
fontToDraw	The font to draw.
graph	The graph.
index	index of the data point.
alpha	The alpha.