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GraphElementGridBase

touchgfx/widgets/graph/GraphElements.hpp

GraphElementGridBase is a helper class used to implement classed to draw grid lines in the graph.

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

Inherited by: GraphElementGridX, GraphElementGridY

Public Functions

virtual voiddraw(const Rect & invalidatedArea) const
Draws the given invalidated area.
virtual intgetCorrectlyScaledGridInterval(const AbstractDataGraph * graph) const =0
Gets correctly scaled minor interval, as the minor grid may have a scale that differs the scale of the graph and this grid line.
virtual intgetCorrectlyScaledMajorInterval(const AbstractDataGraph * graph) const
Gets correctly scaled major interval, as the major grid may have a scale that differs the scale of the graph and this grid line.
FORCE_INLINE_FUNCTION floatgetIntervalAsFloat() const
Gets the interval between each grid line.
FORCE_INLINE_FUNCTION intgetIntervalAsInt() const
Gets the interval between each grid line.
FORCE_INLINE_FUNCTION intgetIntervalScaled() const
Gets the interval between each grid line.
FORCE_INLINE_FUNCTION uint8_tgetLineWidth() const
Gets line width.
FORCE_INLINE_FUNCTION intgetScale() const
Gets the scaling factor set using setScale.
GraphElementGridBase()
Default constructor.
virtual voidinvalidateGraphPointAt(int16_t index)
Invalidate the point at the given index.
FORCE_INLINE_FUNCTION voidsetInterval(float interval)
Sets the interval between each grid line.
FORCE_INLINE_FUNCTION voidsetInterval(int interval)
Sets the interval between each grid line.
FORCE_INLINE_FUNCTION voidsetIntervalScaled(int interval)
Sets the interval between each grid line.
FORCE_INLINE_FUNCTION voidsetLineWidth(uint8_t width)
Sets line width of the grid lines.
FORCE_INLINE_FUNCTION voidsetMajorGrid(const GraphElementGridBase & major)
Sets "major" grid that will be responsible for drawing major grid lines.
FORCE_INLINE_FUNCTION voidsetScale(int scale)
Sets a scaling factor to be multiplied on the grid interval.

Protected Functions

virtual voiddrawLine(const Rect & invalidatedArea, int16_t start, int16_t length, int16_t pos, int16_t width, uint8_t a) const
Draw vertical line using LCD::fillRect and handles negative dimensions properly.
virtual RectenclosingArea(const AbstractDataGraph * graph) const =0
Return the enclosing area for the grid lines.
virtual intgetGraphAreaEndPos(const AbstractDataGraph * graph) const =0
Gets graph area end position.
virtual intgetGraphAreaLength(const AbstractDataGraph * graph) const =0
Gets graph area length (distance from border to border).
virtual intgetGraphAreaStart(const AbstractDataGraph * graph) const =0
Gets graph area start (distance from the border).
virtual intgetGraphAreaStartPos(const AbstractDataGraph * graph) const =0
Gets graph area start position.
virtual intgetGraphRangeMaxScaled(const AbstractDataGraph * graph) const =0
Gets graph range maximum x/y scaled.
virtual intgetGraphRangeMinScaled(const AbstractDataGraph * graph) const =0
Gets graph range minimum x/y scaled.
virtual RectlineRect(int16_t start, int16_t length, int16_t pos, int16_t width) const =0
Return the specific rectangle for line.
virtual CWRUtil::Q5valueToScreenQ5(const AbstractDataGraph * graph, int value) const =0
The graph value to the correct screen coordinate in Q5.

Protected Attributes

intdataScale
The scaling factor.
intgridInterval
The grid line interval.
uint8_tlineWidth
Width of the line.
const GraphElementGridBase *majorGrid
A pointer to a major grid, if any.

Additional inherited members

Public Functions inherited from AbstractGraphElementNoCWR

AbstractGraphElementNoCWR()
virtual booldrawCanvasWidget(const Rect & invalidatedArea) const
Draw canvas widget for the given invalidated area.
virtual colortypegetColor() const
Gets the color of the graph element.
virtual voidsetColor(colortype newColor)
Sets the color of the graph element.

Protected Functions inherited from AbstractGraphElementNoCWR

voidnormalizeRect(Rect & r) const
Normalize rectangle by changing a rectangle with negative width or height to a rectangle with positive width or height at the correct position.

Protected Attributes inherited from AbstractGraphElementNoCWR

colortypecolor
The currently assigned color.

Public Functions inherited from AbstractGraphElement

AbstractGraphElement()
Default constructor.

Protected Functions inherited from AbstractGraphElement

FORCE_INLINE_FUNCTION intconvertToGraphScaleX(const AbstractDataGraph * graph, int value, int scale) const
Converts the value to the proper X scale of the graph.
FORCE_INLINE_FUNCTION intconvertToGraphScaleY(const AbstractDataGraph * graph, int value, int scale) const
Converts the value to the proper Y scale of the graph.
FORCE_INLINE_FUNCTION AbstractDataGraph *getGraph() const
Gets a pointer to the the graph containing the GraphElement.
FORCE_INLINE_FUNCTION intgetIndexToXAxis(const AbstractDataGraph * graph, const int valueScaled, const int labelScaled) const
Convert the given valueScaled (index) to x axis value.
FORCE_INLINE_FUNCTION CWRUtil::Q5indexToScreenXQ5(const AbstractDataGraph * graph, int16_t index) const
Gets screen x coordinate for a specific data point added to the graph.
FORCE_INLINE_FUNCTION CWRUtil::Q5indexToScreenYQ5(const AbstractDataGraph * graph, int16_t index) const
Gets screen y coordinate for a specific data point added to the graph.
boolisCenterInvisible(const AbstractDataGraph * graph, int16_t index) const
Query if the center of a given data point index is visible inside the graph area.
RectrectAround(CWRUtil::Q5 xQ5, CWRUtil::Q5 yQ5, CWRUtil::Q5 diameterQ5) const
Find the screen rectangle around a given point with the specified diameter.
RectrectFromQ5Coordinates(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.
FORCE_INLINE_FUNCTION CWRUtil::Q5roundQ5(CWRUtil::Q5 q5) const
Round the given CWRUtil::Q5 to the nearest integer and return it as a CWRUtil::Q5 instead of an integer.
FORCE_INLINE_FUNCTION CWRUtil::Q5valueToScreenXQ5(const AbstractDataGraph * graph, int x) const
Gets graph screen x for x value.
FORCE_INLINE_FUNCTION CWRUtil::Q5valueToScreenYQ5(const AbstractDataGraph * graph, int y) const
Gets graph screen y for y value.
FORCE_INLINE_FUNCTION boolxScreenRangeToIndexRange(const AbstractDataGraph * graph, int16_t xMin, int16_t xMax, int16_t & indexMin, int16_t & indexMax) const
Gets graph element range for screen x coordinate range.

Public Functions inherited from CanvasWidget

CanvasWidget()
virtual booldrawCanvasWidget(const Rect & invalidatedArea) const =0
Draw canvas widget for the given invalidated area.
virtual uint8_tgetAlpha() const
Gets the current alpha value of the widget.
virtual RectgetMinimalRect() const
Gets minimal rectangle containing the shape drawn by this widget.
const AbstractPainter *getPainter() const
Gets the current painter for the CanvasWidget.
virtual RectgetSolidRect() const
Gets the largest solid (non-transparent) rectangle.
virtual voidinvalidate() const
Invalidates the area covered by this CanvasWidget.
virtual voidsetAlpha(uint8_t newAlpha)
Sets the opacity (alpha value).
voidsetPainter(const AbstractPainter & painter)
Sets a painter for the CanvasWidget.

Protected Attributes inherited from CanvasWidget

uint8_talpha
The Alpha for this CanvasWidget.

Public Functions inherited from Widget

virtual voidgetLastChild(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

voidcenter()
Centers the Drawable inside its parent.
voidcenterX()
Center the Drawable horizontally inside its parent.
voidcenterY()
Center the Drawable vertically inside its parent.
virtual voidchildGeometryChanged()
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.
voiddrawToDynamicBitmap(BitmapId id)
Render the Drawable object into a dynamic bitmap.
voidexpand(int margin =0)
Expands the Drawable to have the same size as its parent with a given margin around the edge.
RectgetAbsoluteRect() 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_tgetHeight() const
Gets the height of this Drawable.
virtual voidgetLastChild(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 RectgetSolidRect() const =0
Get (the largest possible) rectangle that is guaranteed to be solid (opaque).
virtual RectgetSolidRectAbsolute()
Helper function for obtaining the largest solid rect (as implemented by getSolidRect()) expressed in absolute coordinates.
virtual voidgetVisibleRect(Rect & rect) const
Function for finding the visible part of this drawable.
int16_tgetWidth() const
Gets the width of this Drawable.
int16_tgetX() const
Gets the x coordinate of this Drawable, relative to its parent.
int16_tgetY() const
Gets the y coordinate of this Drawable, relative to its parent.
virtual voidhandleClickEvent(const ClickEvent & event)
Defines the event handler interface for ClickEvents.
virtual voidhandleDragEvent(const DragEvent & event)
Defines the event handler interface for DragEvents.
virtual voidhandleGestureEvent(const GestureEvent & event)
Defines the event handler interface for GestureEvents.
virtual voidhandleTickEvent()
Called periodically by the framework if the Drawable instance has subscribed to timer ticks.
virtual voidinvalidate() const
Tell the framework that this entire Drawable needs to be redrawn.
virtual voidinvalidateContent() const
Tell the framework that the contents of the Drawable needs to be redrawn.
virtual voidinvalidateRect(Rect & invalidatedArea) const
Request that a region of this drawable is redrawn.
boolisTouchable() const
Gets whether this Drawable receives touch events or not.
boolisVisible() const
Gets whether this Drawable is visible.
virtual voidmoveRelative(int16_t x, int16_t y)
Moves the drawable.
virtual voidmoveTo(int16_t x, int16_t y)
Moves the drawable.
virtual voidsetHeight(int16_t height)
Sets the height of this drawable.
voidsetPosition(const Drawable & drawable)
Sets the position of the Drawable to the same as the given Drawable.
voidsetPosition(int16_t x, int16_t y, int16_t width, int16_t height)
Sets the size and position of this Drawable, relative to its parent.
voidsetTouchable(bool touch)
Controls whether this Drawable receives touch events or not.
voidsetVisible(bool vis)
Controls whether this Drawable should be visible.
virtual voidsetWidth(int16_t width)
Sets the width of this drawable.
voidsetWidthHeight(const Bitmap & bitmap)
Sets the dimensions (width and height) of the Drawable without changing the x and y coordinates).
voidsetWidthHeight(const Drawable & drawable)
Sets the dimensions (width and height) of the Drawable without changing the x and y coordinates).
voidsetWidthHeight(const Rect & other)
Sets the dimensions (width and height) of the Drawable without changing the x and y coordinates).
voidsetWidthHeight(int16_t width, int16_t height)
Sets the dimensions (width and height) of the Drawable without changing the x and y coordinates).
virtual voidsetX(int16_t x)
Sets the x coordinate of this Drawable, relative to its parent.
voidsetXY(const Drawable & drawable)
Sets the x and y coordinates of this Drawable.
voidsetXY(int16_t x, int16_t y)
Sets the x and y coordinates of this Drawable, relative to its parent.
virtual voidsetY(int16_t y)
Sets the y coordinate of this Drawable, relative to its parent.
virtual voidtranslateRectToAbsolute(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.
Rectrect
The coordinates of this Drawable, relative to its parent.
booltouchable
True if this drawable should receive touch events.
boolvisible
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:
invalidatedAreaThe 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:

Reimplements: touchgfx::CanvasWidget::draw

getCorrectlyScaledGridInterval

Gets correctly scaled minor interval, as the minor grid may have a scale that differs the scale of the graph and this grid line.

Parameters:
graphThe graph.
Returns:

The correctly scaled minor interval.

Reimplemented by: touchgfx::GraphElementGridX::getCorrectlyScaledGridInterval, touchgfx::GraphElementGridY::getCorrectlyScaledGridInterval

getCorrectlyScaledMajorInterval

Gets correctly scaled major interval, as the major grid may have a scale that differs the scale of the graph and this grid line.

Parameters:
graphThe graph.
Returns:

The correctly scaled major interval.

getIntervalAsFloat

FORCE_INLINE_FUNCTION float getIntervalAsFloat()const

Gets the interval between each grid line.

Returns:

The interval between each grid line.

See also:

getIntervalAsInt

FORCE_INLINE_FUNCTION int getIntervalAsInt()const

Gets the interval between each grid line.

Returns:

The interval between each grid line.

See also:

getIntervalScaled

FORCE_INLINE_FUNCTION int getIntervalScaled()const

Gets the interval between each grid line.

Returns:

The interval between each grid line.

Note

The interval returned here is left unscaled.

See also:

getLineWidth

FORCE_INLINE_FUNCTION uint8_t getLineWidth()const

Gets line width.

Returns:

The line width.

See also:

getScale

FORCE_INLINE_FUNCTION int getScale()const

Gets the scaling factor set using setScale.

Returns:

The scaling factor.

See also:

GraphElementGridBase

Default constructor.

invalidateGraphPointAt

virtual void invalidateGraphPointAt(int16_tindex)

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:
indexZero-based index of the point.

Reimplements: touchgfx::AbstractGraphElement::invalidateGraphPointAt

setInterval

FORCE_INLINE_FUNCTION void setInterval(floatinterval)

Sets the interval between each grid line.

Parameters:
intervalThe interval between each grid line.
Note

If interval is 0 only the axis is shown.

See also:

setInterval

FORCE_INLINE_FUNCTION void setInterval(intinterval)

Sets the interval between each grid line.

Parameters:
intervalThe interval between each grid line.
Note

If interval is 0 only the axis is shown.

See also:

setIntervalScaled

FORCE_INLINE_FUNCTION void setIntervalScaled(intinterval)

Sets the interval between each grid line.

Parameters:
intervalThe interval between each grid line.
Note

If interval is 0 only the axis is shown.The interval set here must already be scaled.

See also:

setLineWidth

FORCE_INLINE_FUNCTION void setLineWidth(uint8_twidth)

Sets line width of the grid lines.

Parameters:
widthThe width of the grid lines.
See also:

setMajorGrid

FORCE_INLINE_FUNCTION void setMajorGrid(const GraphElementGridBase &major)

Sets "major" grid that will be responsible for drawing major grid lines.

If a grid line would be drawn at the same position as the major grid line, the grid line will not be drawn.

Parameters:
majorReference to a major grid line object.

setScale

FORCE_INLINE_FUNCTION void setScale(intscale)

Sets a scaling factor to be multiplied on the grid interval.

Any already set grid interval will be updated to the new correctly scaled value. To avoid this, use setIntervalScaled() after setting scale.

Parameters:
scaleThe scaling factor.
See also:

Protected Functions Documentation

drawLine

virtual void drawLine(const Rect &invalidatedArea ,const
int16_tstart ,const
int16_tlength ,const
int16_tpos ,const
int16_twidth ,const
uint8_taconst
)const

Draw vertical line using LCD::fillRect and handles negative dimensions properly.

Parameters:
invalidatedAreaThe invalidated area to intersect the line with.
startThe start coordinate (offset from edge).
lengthThe length of the line.
posThe start coordinate (distance in span).
widthThe width of the line.
aThe alpha of the line.

enclosingArea

virtual Rect enclosingArea(const AbstractDataGraph *graph)

Return the enclosing area for the grid lines.

Vertical lines are allowed to go a bit to the left and right, but not above or below. Vice versa for horizontal gridlines.

Parameters:
graphThe graph.
Returns:

A Rect which the grid lines should be inside.

Reimplemented by: touchgfx::GraphElementGridX::enclosingArea, touchgfx::GraphElementGridY::enclosingArea

getGraphAreaEndPos

virtual int getGraphAreaEndPos(const AbstractDataGraph *graph)

Gets graph area end position.

Horizontal offset of last vertical line or vertical offset of last horizontal line.

Parameters:
graphThe graph.
Returns:

The graph area end position. Horizontal offset of last vertical line or vertical offset of last horizontal line.

Reimplemented by: touchgfx::GraphElementGridX::getGraphAreaEndPos, touchgfx::GraphElementGridY::getGraphAreaEndPos

getGraphAreaLength

virtual int getGraphAreaLength(const AbstractDataGraph *graph)

Gets graph area length (distance from border to border).

Parameters:
graphThe graph.
Returns:

The graph area length (distance from border to border.

Reimplemented by: touchgfx::GraphElementGridX::getGraphAreaLength, touchgfx::GraphElementGridY::getGraphAreaLength

getGraphAreaStart

virtual int getGraphAreaStart(const AbstractDataGraph *graph)

Gets graph area start (distance from the border).

Parameters:
graphThe graph.
Returns:

The graph area start (distance from the border).

Reimplemented by: touchgfx::GraphElementGridX::getGraphAreaStart, touchgfx::GraphElementGridY::getGraphAreaStart

getGraphAreaStartPos

virtual int getGraphAreaStartPos(const AbstractDataGraph *graph)

Gets graph area start position.

Horizontal offset of first vertical line or vertical offset of first horizontal line.

Parameters:
graphThe graph.
Returns:

The graph area start position. Horizontal offset of first vertical line or vertical offset og first horizontal line.

Reimplemented by: touchgfx::GraphElementGridX::getGraphAreaStartPos, touchgfx::GraphElementGridY::getGraphAreaStartPos

getGraphRangeMaxScaled

virtual int getGraphRangeMaxScaled(const AbstractDataGraph *graph)

Gets graph range maximum x/y scaled.

Parameters:
graphThe graph.
Returns:

The graph range maximum scaled.

Reimplemented by: touchgfx::GraphElementGridX::getGraphRangeMaxScaled, touchgfx::GraphElementGridY::getGraphRangeMaxScaled

getGraphRangeMinScaled

virtual int getGraphRangeMinScaled(const AbstractDataGraph *graph)

Gets graph range minimum x/y scaled.

Parameters:
graphThe graph.
Returns:

The graph range minimum scaled.

Reimplemented by: touchgfx::GraphElementGridX::getGraphRangeMinScaled, touchgfx::GraphElementGridY::getGraphRangeMinScaled

lineRect

virtual Rect lineRect(int16_tstart ,const =0
int16_tlength ,const =0
int16_tpos ,const =0
int16_twidthconst =0
)const =0

Return the specific rectangle for line.

Parameters:
startThe start (distance from the border).
lengthThe length (length of the line).
posThe position (horizonal offset for vertical lines, vertical offset for horizontal lines).
widthThe (line) width.
Returns:

A Rect.

Reimplemented by: touchgfx::GraphElementGridX::lineRect, touchgfx::GraphElementGridY::lineRect

valueToScreenQ5

virtual CWRUtil::Q5 valueToScreenQ5(const AbstractDataGraph *graph ,const =0
intvalueconst =0
)const =0

The graph value to the correct screen coordinate in Q5.

Parameters:
graphThe graph.
valueThe value.
Returns:

The graph value to the correct screen coordinate in Q5.

Reimplemented by: touchgfx::GraphElementGridX::valueToScreenQ5, touchgfx::GraphElementGridY::valueToScreenQ5

Protected Attributes Documentation

dataScale

int dataScale

The scaling factor.

gridInterval

int gridInterval

The grid line interval.

lineWidth

uint8_t lineWidth

Width of the line.

majorGrid

const GraphElementGridBase * majorGrid

A pointer to a major grid, if any.