NChart Class Reference

Inherits from NSObject
Declared in NChart.h

Overview

The NChart class provides a container for the chart.

  series

Array of series.

@property (nonatomic, readonly) NSArray *series

Declared In

NChart.h

– addSeries:

Add series to chart.

- (void)addSeries:(NChartSeries *)series

Parameters

series
  • series to add.

See Also

Declared In

NChart.h

– removeSeries:

Remove series from chart.

- (void)removeSeries:(NChartSeries *)series

Parameters

series
  • series to remove.

See Also

Declared In

NChart.h

– removeAllSeries

Remove all series from chart.

- (void)removeAllSeries

Declared In

NChart.h

– addSeriesSettings:

Add global settings for the series. If you previously set some settings, they will be overwritten by new ones.

- (void)addSeriesSettings:(NChartSeriesSettings *)settings

Parameters

settings
  • settings for the series.

See Also

Declared In

NChart.h

– removeSeriesSettings:

Remove all the global settings for the series by given class.

- (void)removeSeriesSettings:(Class)settingsClass

Parameters

settingsClass
  • class of the series settings to remove.

Declared In

NChart.h

– removeAllSeriesSettings

Remove all the global settings for the series.

- (void)removeAllSeriesSettings

Declared In

NChart.h

– seriesSettings:

Get settings of given settings class. If there were no settings set, default settings container for the given type is returned.

- (NChartSeriesSettings *)seriesSettings:(Class)settingsClass

Parameters

settingsClass
  • class of the series settings to search for.

Return Value

settings of the given class.

See Also

Declared In

NChart.h

– updateData

Force chart to be updated. Call this method when you want to reload data from the data source and rebuild the chart. Data are processed by this call and minimums / maximums on axes are calculated.

- (void)updateData

Declared In

NChart.h

– extendData

Force chart to extend the points arrays of series. Only newly added data are processed by this call. Minimums and maximums may change.
Call this method always you want to extend the data array without changing old data. This method causes series to query new portion of data through - (NSArray )seriesDataSourceExtraPointsForSeries:(NChartSeries )series; call of their data sources. But you cannot extend the array of points forever, so there is a property pointsHistoryLength that determines the length of history.

- (void)extendData

Discussion

The difference with updateData is that only newly added points are processed and the array of these points is queried through - (NSArray )seriesDataSourceExtraPointsForSeries:(NChartSeries )series; call of NChartSeriesDataSource. This can save you time by updating large data sets.

See Also

Declared In

NChart.h

  pointsHistoryLength

Property that determines the maximal length of series' points array. The default value is 1000.
The array of points in series is determined after updateData call (by querying points from series' data sources) and then can be extended after extendData call. The property pointsHistoryLength takes effect by using extendData only. The new points are added to the end of the points' array of the series and if the array exceeds the given length, first n points are deleted, where n = array.length - pointsHistoryLength.

@property (nonatomic, assign) NSUInteger pointsHistoryLength

Declared In

NChart.h

– rebuildSeries

Force series to rebuild by reloading data from data source. Call this method when you know that the chart layout (including layout of axes, so min and max values) has not changed, but the data in series have. This method invokes updateSeries automatically. Data are not processed by this call, so values on axes remain unchanged. Use this method if you are absolutely sure minimums and maximums have not changed!

- (void)rebuildSeries

Declared In

NChart.h

– updateSeries

Force series to be updated without reloading data from data source. Call this method when you want to reflect some changes you made in the visual appearance of a series (brush, etc.). A call of rebuildSeries invokes updateSeries automatically.

- (void)updateSeries

Declared In

NChart.h

  streamingMode

Flag determining if streaming mode is enabled. The default value is NO.

@property (nonatomic, assign) BOOL streamingMode

Discussion

If streaming mode is set to YES, pointSelectionEnabled is automatically set to NO to boost the performance of data updating.

See Also

Declared In

NChart.h

– streamData

Stream the data. This causes the updating of chart to display new states of points. The data are going to be processed, so minimum and maximum on the axes may change. Use this method in the following use-case: if your set of points was not changed, but the values in the states of points do, you can update the chart through this method much faster than through regular updateData.

- (void)streamData

Discussion

The difference with rebuildSeries is that streamData does not reload data from data source, but does the optimized data processing (it’s faster than regular data processing). Series will use the points they already have (the points are mutable, so you can change their data anywhere you want).

The difference with updateSeries is that streamData is even faster and does the optimized data processing. So use it to reflect some realtime “streaming” changes of data.

This method requires streamingMode to be on, use streamingMode = YES for this.

The first appearance of series should be initialized by the updateData call. streamData is to change the already displayed series only.

If you want to change the data in separate thread, you should wrap all the data changing routines in the beginTransaction and endTransaction calls.

Declared In

NChart.h

  incrementalMinMaxMode

Incremental minimum and maximum calculation mode. This mode makes sense in streaming mode only. If the incremental mode is on, new minimum cannot be greater and new maximum cannot be less than the ones calculated on the previous datasets. The default value is NO.

@property (nonatomic, assign) BOOL incrementalMinMaxMode

Declared In

NChart.h

– flushChanges

Synchronize all the changes with visual appearance. You may call this method after all your data is updated (it means after you called updateData and playTransition:reverse: because playTransition:reverse: only says that transition should start playing and does not wait till it plays completely) to ensure that the visual appearance will be updated as soon as possible. You may call this method on the big dataset to reduce lag between your updateData call and actual updating. Alternatively, you may call [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:0.1]]; but this will affect your runloop, while flushChanges will not.

- (void)flushChanges

Declared In

NChart.h

– relayout

Force chart to relayout. Call this method if you made some changes but do not want to update data. A call of updateData invokes relayout automatically.

- (void)relayout

Declared In

NChart.h

– alignCenter:

Change position so that the chart is aligned to the center of the screen. This method takes effect in 3D mode only.

- (void)alignCenter:(float)duration

Parameters

duration
  • duration of the animation in seconds.

Declared In

NChart.h

– fitToScreen:

Change zoom and position so that the chart fits the screen (with current rotation, if in 3D).

- (void)fitToScreen:(float)duration

Parameters

duration
  • duration of the animation in seconds.

Declared In

NChart.h

  zoom

Zoom of the chart. The default zoom is 1 which corresponds to the fitting the chart to screen (both in 2D and 3D). The zooming is proportional. If you want non-proportional zoom in 2D mode, you should use zoomToRegionFrom method of NChartValueAxis.

@property (nonatomic, assign) float zoom

Discussion

If you want to alter the initial zoom, you should change the value of this property after updateData call.

Declared In

NChart.h

– zoomTo:duration:delay:

Set zoom for the chart with animation. The zooming is proportional. If you want non-proportional zoom in 2D mode, you should use zoomToRegionFrom method of NChartValueAxis.

- (void)zoomTo:(float)zoom duration:(float)duration delay:(float)delay

Parameters

zoom
  • new zoom of the chart.
duration
  • duration of animation in seconds.
delay
  • delay of animation in seconds.

Discussion

If you want to alter the initial zoom, you should change the value of this property after updateData call.

Declared In

NChart.h

  minZoom

Minimal zoom of the chart. After this zoom is reached by user interactions, chart starts bouncing zoom. The minimal zoom differs in 2D and 3D mode. In 3D mode the default value is 0.5. In 2D it is 1.

@property (nonatomic, assign) float minZoom

Declared In

NChart.h

  maxZoom

Maximal zoom of the chart. After this zoom is reached by user interactions, chart starts bouncing zoom. The maximal zoom differs in 2D and 3D mode. In 2D mode the default value is recalculated each time the chart is laid out (by changing of the frame or by updating data) according to the data on the axes in case shouldCalculate2DZoomBoundsAutomatically flag is set to YES. In 3D the default value is 2.

@property (nonatomic, assign) float maxZoom

Declared In

NChart.h

  shouldCalculate2DZoomBoundsAutomatically

Flag determining if zoom in 2D mode should be calculated automatically (YES) or not (NO). The default value is YES.

@property (nonatomic, assign) BOOL shouldCalculate2DZoomBoundsAutomatically

Declared In

NChart.h

  pivot

Pivot of the chart in the internal chart scene coordinates.
Use this property if you want to save and than restore position of the chart. This property works for 2D and 3D modes. Theoretically you can use this property to pan the chart programmatically, however it is better to use zoomToRegionFrom method of NChartValueAxis.

@property (nonatomic, assign) CGPoint pivot

Declared In

NChart.h

– rotateAroundYToAngle:duration:delay:

Rotate chart around the Y-Axis (vertical axis) with animation (has effect in 3D mode only).

- (void)rotateAroundYToAngle:(float)angle duration:(float)duration delay:(float)delay

Parameters

angle
  • angle around the Y-Axis in radians.
duration
  • duration of the animation in seconds.
delay
  • delay of animation in seconds.

Declared In

NChart.h

– rotateAroundYToAngle:duration:delay:interpolator:

Rotate chart around the Y-Axis (vertical axis) with animation (has effect in 3D mode only).

- (void)rotateAroundYToAngle:(float)angle duration:(float)duration delay:(float)delay interpolator:(NChartInterpolator *)interpolator

Parameters

angle
  • angle around the Y-Axis in radians.
duration
  • duration of the animation in seconds.
delay
  • delay of animation in seconds.
interpolator
  • interpolator that controls the angle changing over the time.

See Also

Declared In

NChart.h

  yAngle

Rotation angle around the Y-Axis (vertical axis) in radians (has effect in 3D mode only). The default value is 3.93 (225 degrees).

@property (nonatomic, assign) float yAngle

Declared In

NChart.h

  initialYAngle

Initial rotation angle around the Y-Axis (vertical axis) in radians (has effect in 3D mode only). The default value is 3.93 (225 degrees).
This is the angle the chart is rotated back to if you call resetTransformations: method.

@property (nonatomic, assign) float initialYAngle

Declared In

NChart.h

  permanentRotationY

Flag determining if permanent rotation around Y-Axis is on (YES), or off (NO). The default value is NO. Use this flag if you want the chart to rotate around Y-Axis without any interactions. This property takes effect in 3D mode only.

@property (nonatomic, assign) BOOL permanentRotationY

Declared In

NChart.h

  permanentRotationYSpeed

Speed of permanent rotation around Y-Axis (in radians per second). The default value is 0. See permanentRotationY for more info about permanent rotation.

@property (nonatomic, assign) float permanentRotationYSpeed

Declared In

NChart.h

– rotateAroundXToAngle:duration:delay:

Rotate chart around the X-Axis (horizontal axis) with animation (has effect in 3D mode only).

- (void)rotateAroundXToAngle:(float)angle duration:(float)duration delay:(float)delay

Parameters

angle
  • angle around the X-Axis in radians.
duration
  • duration of the animation in seconds.
delay
  • delay of animation in seconds.

Declared In

NChart.h

– rotateAroundXToAngle:duration:delay:interpolator:

Rotate chart around the X-Axis (horizontal axis) with animation (has effect in 3D mode only).

- (void)rotateAroundXToAngle:(float)angle duration:(float)duration delay:(float)delay interpolator:(NChartInterpolator *)interpolator

Parameters

angle
  • angle around the X-Axis in radians.
duration
  • duration of the animation in seconds.
delay
  • delay of animation in seconds.
interpolator
  • interpolator that controls the angle changing over the time.

See Also

Declared In

NChart.h

  xAngle

Rotation angle around the X-Axis (horizontal axis) in radians (has effect in 3D mode only). The default value is -0.87 (-50 degrees).

@property (nonatomic, assign) float xAngle

Declared In

NChart.h

  initialXAngle

Initial rotation angle around the X-Axis (horizontal axis) in radians (has effect in 3D mode only). The default value is -0.87 (-50 degrees).
This is the angle the chart is rotated back to if you call resetTransformations: method.

@property (nonatomic, assign) float initialXAngle

Declared In

NChart.h

  permanentRotationX

Flag determining if permanent rotation around X-Axis is on (YES), or off (NO). The default value is NO. Use this flag if you want the chart to rotate around X-Axis without any interactions. This property takes effect in 3D mode only.

@property (nonatomic, assign) BOOL permanentRotationX

Declared In

NChart.h

  permanentRotationXSpeed

Speed of permanent rotation around X-Axis (in radians per second). The default value is 0. See permanentRotationX for more info about permanent rotation.

@property (nonatomic, assign) float permanentRotationXSpeed

Declared In

NChart.h

  shouldLimitRotationX

Flag determining if rotation around X-Axis is limited (YES) or not (NO). The default value is YES.

@property (nonatomic, assign) BOOL shouldLimitRotationX

Declared In

NChart.h

– rotatePolarToAngle:duration:delay:

Rotate polar coordinate system with animation (has effect in 2D mode only).

- (void)rotatePolarToAngle:(float)angle duration:(float)duration delay:(float)delay

Parameters

angle
  • angle of the polar coordinate system in radians.
duration
  • duration of the animation in seconds.
delay
  • delay of animation in seconds.

Declared In

NChart.h

– rotatePolarToAngle:duration:delay:interpolator:

Rotate polar coordinate system with animation (has effect in 2D mode only).

- (void)rotatePolarToAngle:(float)angle duration:(float)duration delay:(float)delay interpolator:(NChartInterpolator *)interpolator

Parameters

angle
  • angle of the polar coordinate system in radians.
duration
  • duration of the animation in seconds.
delay
  • delay of animation in seconds.
interpolator
  • interpolator that controls the angle changing over the time.

Declared In

NChart.h

  polarAngle

Rotation angle of the polar coordinate system in radians (has effect in 2D mode only). The default value is 0 (0 degrees).

@property (nonatomic, assign) float polarAngle

Declared In

NChart.h

  initialPolarAngle

Initial rotation angle of the polar coordinate system in radians (has effect in 2D mode only). The default value is 0 (0 degrees).
This is the angle the chart is rotated back to if you call resetTransformations: method.

@property (nonatomic, assign) float initialPolarAngle

Declared In

NChart.h

  background

Brush that fills the chart’s background.

@property (nonatomic, strong) NChartBrush *background

See Also

Declared In

NChart.h

  drawIn3D

Flag that determines if a chart should be drawn in 3D (YES) or in 2D (NO). The default value is NO.

@property (nonatomic, assign) BOOL drawIn3D

Declared In

NChart.h

  useParallelProjection

Flag that determines if a chart use parallel projection (YES) or perspective projection (NO) in 3D-mode. The default value is NO.

@property (nonatomic, assign) BOOL useParallelProjection

Discussion

This flag takes effect in 3D-mode only.

Declared In

NChart.h

  cartesianSystem

Cartesian coordinates system used to store value axes and supplementary visual items.

@property (nonatomic, readonly) NChartCartesianSystem *cartesianSystem

See Also

Declared In

NChart.h

  polarSystem

Polar coordinates system used to store value axes and supplementary visual items.

@property (nonatomic, readonly) NChartPolarSystem *polarSystem

See Also

Declared In

NChart.h

  sizeAxis

Size axis used to scale the sizes of markers.

@property (nonatomic, readonly) NChartSizeAxis *sizeAxis

See Also

Declared In

NChart.h

  timeAxis

Time axis used to navigate through the time ticks.

@property (nonatomic, readonly) NChartTimeAxis *timeAxis

See Also

Declared In

NChart.h

  pointSelectionEnabled

Flag determining if the chart points can be selected by tap (YES) or not (NO). The default value is YES. If you do not want to select points by tap, it is better to disable selection, because it will save memory and boost the data updating.

@property (nonatomic, assign) BOOL pointSelectionEnabled

Declared In

NChart.h

– resetTransformations:

Reset all transformations to initial values.

- (void)resetTransformations:(float)duration

Parameters

duration
  • duration of animation from current transformations to the beginning.

Declared In

NChart.h

– playTransition:reverse:

Play animated transition from old state to new one. The old state is cached automatically, so the only thing you need to do for animation is to change the series (by calling addSeries: / removeSeries: / removeAllSeries) or data in the series (by updating data source and calling updateData) and than call playTransition:reverse:. State is cached when updateData is called.

- (void)playTransition:(float)duration reverse:(BOOL)reverse

Parameters

duration
  • duration of transition’s animation in seconds.
reverse
  • flag determining if animation should be played in reverse.

Declared In

NChart.h

– resetTransition

Reset transition by cleaning up the cache made from the previous updateData call. Call this method if you want to see animation from the default start positions as if you just started the app.

- (void)resetTransition

Declared In

NChart.h

– isTransitionPlaying

Check if transition is playing.

- (BOOL)isTransitionPlaying

Return Value

YES if playing, NO if not.

Declared In

NChart.h

– stopTransition

Stop transition. This will stop all the transition animations, even if they are not played till the end or if they where delayed and did not even start animating.

- (void)stopTransition

Declared In

NChart.h

  legend

Legend of the chart.

@property (nonatomic, readonly) NChartLegend *legend

See Also

Declared In

NChart.h

  scaleLegends

Scale legends array. It’s empty by default.

@property (nonatomic, readonly) NSArray *scaleLegends

See Also

Declared In

NChart.h

– addScaleLegend:

Add scale legend.

- (void)addScaleLegend:(NChartScaleLegend *)scaleLegend

Parameters

scaleLegend
  • scale legend to add.

See Also

Declared In

NChart.h

– removeScaleLegend:

Remove scale legend.

- (void)removeScaleLegend:(NChartScaleLegend *)scaleLegend

Parameters

scaleLegend
  • scale legend to remove.

See Also

Declared In

NChart.h

– removeAllScaleLegends

Remove all scale legends.

- (void)removeAllScaleLegends

See Also

Declared In

NChart.h

  caption

Caption of the chart.

@property (nonatomic, readonly) NChartCaption *caption

See Also

Declared In

NChart.h

  margin

Margin of the chart that determines how far the content of chart starts from view’s bounds. The default margin is zero on all sides.

@property (nonatomic, assign) NChartMargin margin

Declared In

NChart.h

  showFPS

Flag that determines if FPS rate should be displayed (YES) or not (NO). You may use this for debug purposes or if you are just curious, but it’s a very bad idea to show FPS in production code, because it results in continuous rendering that loads CPU and consumes power. If FPS is off, the picture is re-rendered only if it’s really needed. The default value is NO.

@property (nonatomic, assign) BOOL showFPS

Declared In

NChart.h

  shouldAntialias

Flag that determines if the image should be anti-aliased (YES) or not (NO). Antialiasing makes the picture smoother, but impacts performance. The default value is NO.

@property (nonatomic, assign) BOOL shouldAntialias

Declared In

NChart.h

  adaptiveAntialiasing

Flag that determines if anti-aliasing is adaptive (YES) or not (NO). Adaptivity means that it is switched off automatically for the time-critical periods like user interactions or animation playing. This property takes effect if shouldAntialias is YES only. The default value is YES.

@property (nonatomic, assign) BOOL adaptiveAntialiasing

Declared In

NChart.h

  zoomMode

Zoom mode used in chart. The default is NChartZoomModeProportional.

@property (nonatomic, assign) NChartZoomMode zoomMode

See Also

Declared In

NChart.h

  zoomToPointMode

Flag that determines if chart is zoomed to the cursor (YES) or to the screen center (NO). The default value is NO.

@property (nonatomic, assign) BOOL zoomToPointMode

Declared In

NChart.h

  shouldBounceZoom

Flag that determines if zoom should bounce (YES) or not (NO). The default value is YES.

@property (nonatomic, assign) BOOL shouldBounceZoom

Declared In

NChart.h

  shouldBouncePan

Flag that determines if pan should bounce (YES) or not (NO). The default value is YES.

@property (nonatomic, assign) BOOL shouldBouncePan

Declared In

NChart.h

  userInteractionMode

Interaction mode used in the chart. The default is NChartUserInteractionAll.

@property (nonatomic, assign) NSUInteger userInteractionMode

Discussion

You can use multiple interactions concatenated with bitwise OR to specify the mask of what is available.

See Also

Declared In

NChart.h

  shadingModel

Shading model that is used in 3D mode. The default value is NChartShadingModelPhong.

@property (nonatomic, assign) NChartShadingModel shadingModel

Discussion

This property controls shading for the 3D charts like surfaces, columns, etc. Shading model for point markers is controlled through their brushes.

This property takes effect in 3D mode only.

See Also

Declared In

NChart.h

  alwaysPreserveZoomAndPosition

Flag determining if chart content always preserves zoom and position (YES) or not (NO). This flag takes effect in 3D mode only. If this flag is set to NO, when you change the frame of the chart, 3D content will be zoomed and shifted to fit the screen. If this flag is set to YES, you should call resetTransformations: to fit the content in the screen manually. The default value is NO.
The common use-case for this flag is when you smoothly change the size of the chart. For such resize session you should set this flag to YES, and after the session you should probably call resetTransformations:.

@property (nonatomic, assign) BOOL alwaysPreserveZoomAndPosition

Declared In

NChart.h

  hoverEnabled

Flag determining if hover mode is enabled (YES) or not (NO). With hover enabled, - (void)chartDelegatePointOfChart:(NChart )chart hovered:(NChartPoint )point phase:(NChartHover)phase; method of chart delegate will fire if mouse hovers chart points. The default value is false.
If you do not need to handle hover, you’d better switch off the hover mode, because it slightly lowers the rendering performance. Hover also requires pointSelectionEnabled to be YES, however, does not set it automatically.

@property (nonatomic, assign) BOOL hoverEnabled

See Also

Declared In

NChart.h

– beginTransaction

Begin data changing transaction. You should call this method before any changes of chart settings/data in separate thread. After the changes are made, you should call endTransaction. The typical use-case of multithreading in NChart3D is the streaming - the realtime data updating.

- (void)beginTransaction

Discussion

there is no sense to call this method in main thread.

See Also

Declared In

NChart.h

– endTransaction

End data changing transaction.

- (void)endTransaction

See Also

Declared In

NChart.h

  shouldConvertZoomToAllowed

Flag determining if all zoom should be converted to the allowed zoom modes (YES) or not (NO). The default value is YES.
If this flag is YES, all the zoom directions are converted to the allowed zoom directions. For example, if only horizontal zoom is allowed, and user zooms in diagonal direction, chart is zoomed horizontally with this flag set to YES.

@property (nonatomic, assign) BOOL shouldConvertZoomToAllowed

Declared In

NChart.h

  shouldAutoScroll

Flag determining if chart should automatically scroll (YES) or not (NO) to the end if new data are added by the extendData call. The default value is NO.
This flag takes effect in 2D mode only.

@property (nonatomic, assign) BOOL shouldAutoScroll

See Also

Declared In

NChart.h

  autoScrollDuration

Duration of auto scroll in seconds. The default value is 0.25.

@property (nonatomic, assign) float autoScrollDuration

See Also

Declared In

NChart.h

  shouldToggleAutoScrollByPan

Flag determining if automatical scroll should be automatically toggled by pan (YES) or not (NO). The default value is NO.
If this flag is YES, automatical scroll is switched on (shouldAutoScroll is set to YES) if user pans to the right-most position of the chart and switched off (shouldAutoScroll is set to NO) if user pans left. This flag takes effect in 2D mode only.

@property (nonatomic, assign) BOOL shouldToggleAutoScrollByPan

See Also

Declared In

NChart.h

  autoScrollLabel

Label that indicates whenever automatical scroll is switched on or off. The default value is nil.
This label takes effect in 2D mode only.

@property (nonatomic, strong) NChartAutoScrollLabel *autoScrollLabel

See Also

Declared In

NChart.h

  staticLines

Array of static lines. Static line are the lines drawn on top of the chart plot area in the given position, not moving with the chart series and not responding to the user interactions.

@property (nonatomic, readonly) NSArray *staticLines

Discussion

You can use static lines to make custom borders or static visual indicators.

Declared In

NChart.h

– addStaticLine:

Add static line.

- (void)addStaticLine:(NChartStaticLine *)staticLine

Parameters

staticLine
  • static line to add.

See Also

Declared In

NChart.h

– removeAllStaticLines

Remove all static lines.

- (void)removeAllStaticLines

See Also

Declared In

NChart.h

  shouldStopAtCenter

Flag indicating if series should stop scrolling at the center of the chart plot area (YES) or at the right/left border (NO). The default value is NO.

@property (nonatomic, assign) BOOL shouldStopAtCenter

Discussion

This property has effect in 2D mode only and only with the series based on the Cartesian system.

Declared In

NChart.h

– performScrollAt:translation:velocity:touchesCount:phase:

Perform scroll. This method is useful if you need to simulate the event of scroll interaction (like pan or drag).

- (void)performScrollAt:(CGPoint)location translation:(CGPoint)translation velocity:(CGPoint)velocity touchesCount:(int)touchesCount phase:(NChartEventPhase)phase

Parameters

location
  • location where the scroll appears in view’s coordinates. In terms of pan or drag it is location of pointer.
translation
  • difference of current location from initial location (location at the beginning of scroll session).
velocity
  • velocity of scroll, i.e. of translation changing.
touchesCount
  • number of pointers performing scroll. In multitouch it is number of fingers.
phase
  • phase of scroll session.

Declared In

NChart.h

– performScaleAt:direction:scale:velocity:phase:

Perform scale. This method is useful if you need to simulate the event of scale interaction (like pinch or zoom).

- (void)performScaleAt:(CGPoint)location direction:(CGPoint)direction scale:(float)scale velocity:(float)velocity phase:(NChartEventPhase)phase

Parameters

location
  • location where the scale appears in view’s coordinates. In terms of pinch or zoom it is location of pointer.
direction
  • direction of scale change. In multitouch it is vector between pinching finger positions.
scale
  • current scale.
velocity
  • velocity of scale change.
phase
  • phase of scale session.

Declared In

NChart.h

  licenseKey

License key of product.

@property (nonatomic, strong) NSString *licenseKey

Declared In

NChart.h

  versionInfo

Get version info.

@property (nonatomic, readonly) NSString *versionInfo

Declared In

NChart.h

  delegate

Chart delegate.

@property (nonatomic, assign) id<NChartDelegate> delegate

See Also

Declared In

NChart.h