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The TRSPieChart component is a RSChartPanel.TRSCustomChart descendant that represents a pie chart. The Pie Chart displays each chart value ( RSCharts.TRSPieChartValue) as a slice of the pie in the pie chart. The size of the slice is dependant on all the other slices in the pie chart, e.g., the size of a slice is proportional to the percentage that the pie slice's value is to the sum of all slices. The pie chart draws each slice starting from 3 o'clock position on a clock and goes counter-clockwise from there. Modify the    Offset angle to change the starting angle.

Note that the pie chart always fills the rectangle between the axes on the chart panel, e.g., you cannot zoom in on a pie chart. You can, however, change the    OuterRadius property to shrink the pie chart and the    Origin property to move its center point.
 

PieChartExample2

Namespace: RSCharts

 (Inherited from RSChartPanel.TRSCustomChart.)

public method

DrawAxes(TCanvas,TCanvasRect,TRSChartAxis,TRSChartAxis)

Draws the specified axes to the Canvas (Inherited from RSChartPanel.TRSCustomChart.)

public method

DrawGlyph(TCanvas,TCanvasRect)

Overloaded. Represents method DrawGlyph(TCanvas,TCanvasRect). (Inherited from RSChartPanel.TRSCustomChart.)

public method

DrawGlyph(TCanvas,TRSChartValue,TCanvasRect)

Overloaded. Represents method DrawGlyph(TCanvas,TRSChartValue,TCanvasRect). (Inherited from RSChartPanel.TRSCustomChart.)

protected method

Drawing(TCanvas,TCanvasRect)

Calls the OnDrawing event and returns True if the draw process should continue.

This method is called before the InternalDraw method.

public method

DrawLabel(TCanvas,String,TCanvasPixel,TCanvasPixel,Single)

Overloaded. Draws the text caption centered above the X, Y point without clipping.

noteNote

The Opacity is ignored in VCL

public method

DrawLabel(TCanvas,String,TCanvasRect,Single)

Overloaded. Draws the text caption centered within the rectangle. The text is clipped

noteNote

The Opacity is ignored in VCL

public method

DrawLabel(TCanvas,TRSChartValue,TCanvasPixel,TCanvasPixel)

Overloaded. Draws the text caption centered above the X, Y point without clipping.

noteNote

The Opacity is specified by the RSChartPanel.TRSChartValue.Opacity property

public method

DrawLabel(TCanvas,TRSChartValue,TCanvasRect)

Overloaded.  Draws a label for the TRSChartValue on the canvas. The text of the label is controlled by the ValueLabelStyle property.

The label is drawn within the specified rectangle.

noteNote

The Opacity is specified by the RSChartPanel.TRSChartValue.Opacity property

protected method

Drawn(TCanvas,TCanvasRect)

Calls the OnDraw event.

This method is called after the InternalDraw method.

protected method

DrawPieSlice(TCanvas,TCanvasRect,Double,Double,TRSPieChartValue,TPieSliceOptions)

Draw One Pie Slice

protected method

DrawSlices(TCanvas,TCanvasRect,TPieSliceOptions)

Draw all the pie slices of the chart

public method

EndUpdate

Re-enables screen repainting and change events. Use EndUpdate to re-enable screen repainting and change events that were turned off with the BeginUpdate method. (Inherited from RSChartPanel.TRSCustomChart.)

public method

FormatValue(TRSChartValue,TRSLabelTextStyle)

Generates a label for the Value based on the TextStyle (Inherited from RSChartPanel.TRSCustomChart.)

public method

GetAdjOffsetVertical

Returns the vertical offset (     OffsetVertical).

If coUseVerticalOffset is not in     Options, this method always returns 0. If coUseVerticalOffset is in Options, the function returns the OffsetVertical value.

public method

GetAxisCaption(TRSChartAxis,Integer,TRSChartValueType)

Returns a label for an axis ( RSChartPanel.TRSChartAxis ) based on the input Value. The Index specifies where to start looking in the chart Values (for optimization purposes) and decrements from there until the closest chart value is found. (Inherited from RSChartPanel.TRSCustomChart.)

public methodClass member

GetChartType

Returns the chart type enumerated value for this class. Each chart class overrides this class function to return the RSChartConsts|TRSChartType enumerated value (Overrides RSChartPanel.TRSCustomChart.GetChartType.)

protected method

GetColor

Overloaded. Represents method GetColor. (Inherited from RSChartPanel.TRSCustomChart.)

public method

GetColor(TRSChartValue)

Overloaded. Returns the color of the chart value. The color of the TRSChartValue can change depending on the   Options property as well as any other chart states (e.g., the TRSCandleStickChart class overrides this method to turn the color red or green depending on if the Open value is greater than the Closing Value) (Inherited from RSChartPanel.TRSCustomChart.)

public method

GetCumulativeTotal(Integer,Integer,TRSCustomChartClass)

Determine the cumulative value at this index for all charts in the Group. The ValIndex specifies the     TRSChartValue.Values dimension to compare.

Used for stacking charts.

public method

GetCumulativeValue(Integer,Integer,TRSCustomChartClass)

Determine the cumulative value at this index for all charts below (spatially) this chart in the same     Group. The ValIndex specifies the     TRSChartValue.Values dimension to compare.

Used for stacking charts.

protected method

GetGroupDimension

Represents method GetGroupDimension. (Inherited from RSChartPanel.TRSCustomChart.)

protected method

GetRadius(TRSPieChartValue,Single,Single)

Returns the InnerRadius and OuterRadius of the pie chart

public method

GetSlicePath(TCanvasRect,TRSPieChartValue)

Returns the path data for drawing that pie chart value

public method

GetValueColor

Returns a new chart color based on the   ChartColorScheme and   ChartColorList. Every time a chart is created, it is assigned a new color from the current ChartColorList. (Inherited from RSChartPanel.TRSCustomChart.)

protected method

InitializeChangeEvents

Initialize the OnChange events of structures. Use this method to assign event handlers for structures (e.g., Pen.OnChange := MyChangeMethod).

alert_noteNotes to Inheritors

The constructor calls this method after it calls the InitializeChart method, which is where the structures should be actually created and initialized.

protected method

InitializeChart

Creates and initialize structures and values of chart. This method is the safe place to initialize chart values without change events occurring.

alert_noteNotes to Inheritors

The constructor calls this method. Use this method to actually create and initialize properties. Do not assign event properties in this method (use the InitializeChangeEvents method instead)

protected method

InternalDraw(TCanvas,TCanvasRect)

Overloaded.  Paints the chart graphic to the specified canvas at the specified rectangle. The InternalDraw method is called by the     Draw method.

Descendant classes of TRSCustomChart override the InternalDraw method to actually paint themselves.

alert_noteNotes to Inheritors

The default InternalDraw method implementation assigns the     Brush, Pen , and Font to the Canvas.

protected method

InternalSelect(TCanvasRect,TRSChartSelectionAction)

Selects or deselects chart Values ( RSChartPanel.TRSChartValue ) based on whether they intersect with the selection rectangle (which is in pixel coordinates).

The base method converts the SelectionRect to chart coordinates (based on     HorizontalAxis and     VerticalAxis) and then selects values based on the TRSChartValue.Selectable method

public method

IsSelectable(TCanvasRect)

Returns True if any value in the chart intersects with the SelectionRect (Overrides RSChartPanel.TRSCustomChart.IsSelectable(TCanvasRect).)

protected method

IsValuesStored

Represents method IsValuesStored. (Inherited from RSChartPanel.TRSCustomChart.)

public method

IsVisible

Indicates whether the chart is visible. A chart is visible if its Visible property is True and both axes have been assigned. (Inherited from RSChartPanel.TRSCustomChart.)

protected method

Loaded

Represents method Loaded. (Inherited from RSChartPanel.TRSCustomChart.)

protected method

MouseHover(TCanvasRect)

Represents method MouseHover(TCanvasRect). (Inherited from RSChartPanel.TRSCustomChart.)

protected method

Notification(TComponent,TOperation)

Represents method Notification(TComponent,TOperation). (Inherited from RSChartPanel.TRSCustomChart.)

protected method

Paint

Represents method Paint. (Inherited from RSChartPanel.TRSCustomChart.)

protected method

PanelChanged

Represents method PanelChanged. (Inherited from RSChartPanel.TRSCustomChart.)

protected method

RSVisibleChanged

Represents method RSVisibleChanged. (Inherited from RSChartPanel.TRSCustomChart.)

protected method

SaveCanvasResources(TCanvas,TBrush,TRSPen,TFont)

Represents method SaveCanvasResources(TCanvas,TBrush,TRSPen,TFont). (Inherited from RSChartPanel.TRSCustomChart.)

public method

Select(TCanvasRect,TRSChartSelectionAction)

Selects or deselects chart Values ( RSChartPanel.TRSChartValue ) based on whether they intersect with the selection rectangle (which is in pixel coordinates).

The base method converts the SelectionRect to chart coordinates (based on     HorizontalAxis and     VerticalAxis) and then selects values based on the TRSChartValue.Selectable method

alert_noteNotes to Inheritors

Descendant classes override the InternalSelect method

protected method

SelectionColorChanged

Represents method SelectionColorChanged. (Inherited from RSChartPanel.TRSCustomChart.)

protected method

SenderChanged(TObject)

Overloaded. Represents method SenderChanged(TObject). (Inherited from RSChartPanel.TRSCustomChart.)

protected method

SetCanvasResources(TCanvas,TBrush,TRSPen,TFont,Boolean,Boolean)

Overloaded. Represents method SetCanvasResources(TCanvas,TBrush,TRSPen,TFont,Boolean,Boolean). (Inherited from RSChartPanel.TRSCustomChart.)

protected method

SetCanvasResources(TCanvas,TRSChartValue,Boolean,Boolean)

Overloaded. Represents method SetCanvasResources(TCanvas,TRSChartValue,Boolean,Boolean). (Inherited from RSChartPanel.TRSCustomChart.)

protected method

SetColor(TCanvasColor)

Represents method SetColor(TCanvasColor). (Inherited from RSChartPanel.TRSCustomChart.)

protected method

SetOptions(TChartOptions)

Represents method SetOptions(TChartOptions). (Overrides RSChartPanel.TRSCustomChart.SetOptions(TChartOptions).)

protected method

UpdateAxisInfo(TRSChartAxis)

Represents method UpdateAxisInfo(TRSChartAxis). (Inherited from RSChartPanel.TRSCustomChart.)

protected method

UpdateColorScheme

Updates the values to the current color scheme. If PanelColorScheme is True then uses the Panel's color scheme (Inherited from RSChartPanel.TRSCustomChart.)

protected method

ValueSelectionChanged(TRSChartValue)

Represents method ValueSelectionChanged(TRSChartValue). (Inherited from RSChartPanel.TRSCustomChart.)

protected method

ValueVisibleChanged(TRSChartValue)

Represents method ValueVisibleChanged(TRSChartValue). (Inherited from RSChartPanel.TRSCustomChart.)

protected method

WantsCaptions(TRSChartAxis)

Returns true if the chart prefers Captions over Values for its labels on the input Axis. This method provides a hint to the TRSChartAxis when LabelStyle is alsAutomatic. (Inherited from RSChartPanel.TRSCustomChart.)

Top

To add a pie slice to the chart (at Design-Time):

Select the TRSPieChart component
 

Click the ellipsis button (...) for the Values property of the chart. This action displays Delphi's Collection Editor for the TRSPieChartValues collection.

Use the Add button to add pie slices (TRSPieChartValue collection item) to the chart.
 

Edit the Value property for the pie slice. Note that the size of the slice is dependant on the value's proportion of the sum of all pie slice values
 

To add a pie slice to the chart (at Run-Time):

Delphi

var
   Value: TRSPieChartValue;  // note, this type should be the same that the chart uses (e.g., TRS2DChartValue, TRSArrowChartValue, etc)
 begin
   // Add pie slice
   Value := MyChart.Values.Add;
   Value.Color := clRed;
   Value.Value := 10.0;
 end; 

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