The TRSScatterChart component is a RSCharts.TRSCustomPointChart descendant that represents a scatter chart. The scatter chart displays chart values ( TRSScatterChartValue) as scattered points which may optionally be connected by lines and filled in (see
LineChartElements property).
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Charts are TGraphicControl descendants for VCL and TControl descendants for FMX. Display charts on a chart panel (with integrated axes, legend, header, footers, etc) or stand-alone (allowing use of FMX effects or embedding within other controls). Set the Panel property to the RSChartPanel.TRSChartPanel you want the chart displayed inside or nil for stand-alone use. |
Namespace: RSCharts
TGraphicControl |
Delphi |
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(Inherited from RSChartPanel.TRSCustomChart.) |
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Draw(TCanvas,TCanvasRect,TRSChartAxis,TRSChartAxis,Boolean,Boolean) |
Overloaded. Paints the chart to the specified Canvas in the specified location. The Draw Method uses the supplied TRSChartAxis (instead of the HorizontalAxis and VerticalAxis properties) to convert the chart values into pixel coordinates. Unlike the regular Draw method, this method draws the axes as well (useful for when the chart is not connected to a panel). Use the Draw method to paint the chart to any canvas and anywhere and with any size on the canvas. |
(Inherited from RSChartPanel.TRSCustomChart.)
DrawArea(TCanvas,TCanvasRect,Boolean)
Overloaded. Represents method DrawArea(TCanvas,TCanvasRect,Boolean).
DrawAxes(TCanvas,TCanvasRect,TRSChartAxis,TRSChartAxis)
Draws the specified axes to the Canvas (Inherited from RSChartPanel.TRSCustomChart.)
DrawGlyph(TCanvas,TCanvasRect)
Overloaded. Represents method DrawGlyph(TCanvas,TCanvasRect). (Inherited from RSChartPanel.TRSCustomChart.)
DrawGlyph(TCanvas,TRSChartValue,TCanvasRect)
Represents method DrawGlyph(TCanvas,TRSChartValue,TCanvasRect). (Overrides RSChartPanel.TRSCustomChart.DrawGlyph(TCanvas,TRSChartValue,TCanvasRect).)
Calls the OnDrawing event and returns True if the draw process should continue.
This method is called before the InternalDraw method.
DrawLabel(TCanvas,String,TCanvasPixel,TCanvasPixel,Single)
Overloaded. Draws the text caption centered above the X, Y point without clipping.
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The Opacity is ignored in VCL |
DrawLabel(TCanvas,String,TCanvasRect,Single)
Overloaded. Draws the text caption centered within the rectangle. The text is clipped
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The Opacity is ignored in VCL |
DrawLabel(TCanvas,TRSChartValue,TCanvasPixel,TCanvasPixel)
Overloaded. Draws the text caption centered above the X, Y point without clipping.
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The Opacity is specified by the RSChartPanel.TRSChartValue.Opacity property |
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.
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The Opacity is specified by the RSChartPanel.TRSChartValue.Opacity property |
DrawLine(TCanvas,TCanvasRect,Boolean)
Draws the entire line for the chart. The method calls other methods depending on the LineStyle. (Overrides RSCharts.TRSCustomLineChart.DrawLine(TCanvas,TCanvasRect,Boolean).)
DrawLine(TCanvas,TRS2DChartValue,TCanvasRect,TCanvasPixel,TCanvasPixel,Boolean)
Overloaded. Draws the line for the line segment (from last point value to this point value) (Inherited from RSCharts.TRSCustomLineChart.)
Calls the OnDraw event.
This method is called after the InternalDraw method.
DrawPoint(TCanvas,TCanvasRect,TRSPointChartValue)
Draws one point at the specified rectangle (Inherited from RSCharts.TRSCustomPointChart.)
DrawSmoothline(TCanvas,TCanvasRect,Boolean)
Draws the smooth line for the entire values collection (i.e., the LineStyle is lsCurveInterpolation or lsCurveApproximation). If the LineStyle is lsCurveInterpolation, it uses the DrawSmoothSegment method for each segment of the line. (Inherited from RSCharts.TRSCustomLineChart.)
DrawSmoothSegment(TCanvas,TRS2DChartValue,TCanvasPoint,TCanvasPoints,Boolean)
Draws a smooth line segment using the SegmentPoints. The Line is assumed to touch all the segment points (i.e., the LineStyle is lsCurveInterpolation) (Inherited from RSCharts.TRSCustomLineChart.)
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.)
FormatValue(TRSChartValue,TRSLabelTextStyle)
Generates a label for the Value based on the TextStyle (Inherited from RSChartPanel.TRSCustomChart.)
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.
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.)
Returns the chart type enumerated value for this class. Each chart class overrides this class function to return the RSChartConsts|TRSChartType enumerated value (Overrides RSCharts.TRSCustomPointChart.GetChartType.)
Represents method GetColor. (Overrides RSChartPanel.TRSCustomChart.GetColor.)
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.)
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.
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.
Represents method GetGroupDimension. (Inherited from RSChartPanel.TRSCustomChart.)
GetPoints(TCanvasPoint,TCanvasPoint,TCanvasRect)
Returns an array of points from StartPoint to EndPoint based on the LineStyle and LineChartElements (Inherited from RSCharts.TRSCustomLineChart.)
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.)
Initialize the OnChange events of structures. Use this method to assign event handlers for structures (e.g., Pen.OnChange := MyChangeMethod).
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The constructor calls this method after it calls the InitializeChart method, which is where the structures should be actually created and initialized. |
Creates and initialize structures and values of chart. This method is the safe place to initialize chart values without change events occurring.
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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) |
InternalDraw(TCanvas,TCanvasRect)
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.
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The default InternalDraw method implementation assigns the Brush, Pen , and Font to the Canvas. |
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
Returns True if any value in the chart intersects with the SelectionRect (Inherited from RSChartPanel.TRSCustomChart.)
Represents method IsValuesStored. (Inherited from RSChartPanel.TRSCustomChart.)
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.)
Represents method Loaded. (Inherited from RSChartPanel.TRSCustomChart.)
Represents method MouseHover(TCanvasRect). (Inherited from RSChartPanel.TRSCustomChart.)
Notification(TComponent,TOperation)
Represents method Notification(TComponent,TOperation). (Overrides RSChartPanel.TRSCustomChart.Notification(TComponent,TOperation).)
Represents method Paint. (Inherited from RSChartPanel.TRSCustomChart.)
Represents method PanelChanged. (Inherited from RSChartPanel.TRSCustomChart.)
Represents method RSVisibleChanged. (Inherited from RSChartPanel.TRSCustomChart.)
SaveCanvasResources(TCanvas,TBrush,TRSPen,TFont)
Represents method SaveCanvasResources(TCanvas,TBrush,TRSPen,TFont). (Inherited from RSChartPanel.TRSCustomChart.)
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
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Descendant classes override the InternalSelect method |
Represents method SelectionColorChanged. (Inherited from RSChartPanel.TRSCustomChart.)
Overloaded. Represents method SenderChanged(TObject). (Inherited from RSChartPanel.TRSCustomChart.)
SetCanvasResources(TCanvas,TBrush,TRSPen,TFont,Boolean,Boolean)
Overloaded. Represents method SetCanvasResources(TCanvas,TBrush,TRSPen,TFont,Boolean,Boolean). (Inherited from RSChartPanel.TRSCustomChart.)
SetCanvasResources(TCanvas,TRSChartValue,Boolean,Boolean)
Represents method SetCanvasResources(TCanvas,TRSChartValue,Boolean,Boolean). (Overrides RSChartPanel.TRSCustomChart.SetCanvasResources(TCanvas,TRSChartValue,Boolean,Boolean).)
Represents method SetColor(TCanvasColor). (Overrides RSChartPanel.TRSCustomChart.SetColor(TCanvasColor).)
Represents method SetOptions(TChartOptions). (Overrides RSChartPanel.TRSCustomChart.SetOptions(TChartOptions).)
Represents method UpdateAxisInfo(TRSChartAxis). (Inherited from RSChartPanel.TRSCustomChart.)
Updates the values to the current color scheme. If PanelColorScheme is True then uses the Panel's color scheme (Inherited from RSChartPanel.TRSCustomChart.)
ValueSelectionChanged(TRSChartValue)
Represents method ValueSelectionChanged(TRSChartValue). (Inherited from RSChartPanel.TRSCustomChart.)
ValueVisibleChanged(TRSChartValue)
Represents method ValueVisibleChanged(TRSChartValue). (Inherited from RSChartPanel.TRSCustomChart.)
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.)
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To display a chart, you drop the component on a form and optionally connect its Panel property to the RSChartPanel.TRSChartPanel component where you want it to be displayed. The Values property is the most important property of the chart type and allows you to define the chart values at design-time or run-time. For the Scatter Chart, the Values property contains TRSScatterChartValue collection items which define the each point in the chart. The LineChartElements property controls how to connect the scattered points. The LineStyle property controls the style of the lines that connect the points. To display a scatter chart inside a chart panel: • Drop a TRSScatterChart component on a form • Drop a TRSChartPanel component where you want the chart to be displayed. (Note, more than one chart can share the same chart panel) • Connect the Panel property of the chart to the chart panel |
To add a point to the chart (at Design-Time):
• Select the TRSScatterChart component • Click the ellipsis button (...) for the Values property of the chart. This action displays Delphi's Collection Editor for the TRSPointChartValues collection. • Use the Add button to add areas (TRSPointChartValue collection item) to the chart. • Edit the X and Y properties for the point • Edit the Color property to change the color of the area |
To add a point to the chart (at Run-Time):
Delphi |
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var |
To change the appearance of all the points in the chart (at Design-Time):
• Select the TRSScatterChart component
• Expand the PointsInfo property
• Edit the Width and Height properties to change the size of all the points
• Edit the Style property to define the shape of the point. (For Image Points, you also need to set the DefaultStyle property (which is used when the point does not have a valid ImageIndex value. You also need to assign TImageList component to the ImageList property.
• Edit the Brush and Pen properties which control the colors, fill patterns, and lines of the points (except if the Style is ssImage)
Delphi
begin
// Make all the charts 30x30 pixels and the Style to be ssEllipsis
RSScatterChart1.PointsInfo.Height := 30;
RSScatterChart1.PointsInfo.Width := 30;
RSScatterChart1.PointsInfo.Style := ssEllipsis;
end;
Reference•TRSDBScatterChart |
