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Class PegLineChart

PegLineChart is a simple abstract down from PegChart and supports the displaying of a single line on a given scale.

class PegLineChart : public PegChart
{ 
   public: 
      PegLineChart(const PegRect& Rect, LONG lMinX, LONG lMaxX, LONG lMinY, 
                   LONG lMaxY, PEGUINT wXScale, PEGUINT wYScale); 
      virtual void Draw(void); 
      virtual PEGINT Message(const PegMessage& Mesg); 
      virtual void RecalcSize(const PegRect& NewSize, BOOL bRedraw = TRUE); 
      void RecalcLine(); 
      void ResetLine(); 
      PegChartPoint * AddPoint(LONG lX, LONG lY); 
      PegChartPoint * InsertPoint(PegChartPoint * pPreviousPoint, 
         LONG lX, LONG lY); 
      PegChartPoint * RemovePoint(PegChartPoint * pPoint); 
      PegChartPoint * GetFirstPoint(void) const; 
      COLORVAL GetLineColor(void) const; 
      COLORVAL SetLineColor(COLORVAL cColor); 
};

Style Flags

PegLineChart supports the same styles as PegChart.

Constructor

The constructor is identical to the base class PegChart.

Method Draw

PegLineChart overrides the Draw() function to draw the line segments that make up the line.

Method Message

PegLineChart overrides the Message method in order to provide appropriate layout recalculation when its parent is moved, or optionally, resized.

Method RecalcSize

This method is overridden in order to ensure that the line data is up to date. In other words, if the chart is moved or resized, the screen coordinates associated with a given data point will change. In order to keep up with these changes, this method calls the RecalcLine method to update the screen coordinates of all the data points associated with the line.

Method RecalcLine

Forces a recalculation of the screen coordinates for every point on the line.

Method ResetLine

Removes all of the points associated with the line.

Method AddPoint

Adds a point to the end of the line segment and returns a pointer to the point.

Method InsertPoint

Inserts a point after the point pointed to by pPoint and returns a pointer to the point.

Method RemovePoint

Removes the point pointed to by pPoint. It returns a pointer to the point proceeding the deleted point, or NULL if there is none.

Method GetFirstPoint

Returns the first point of the line segment.

Method GetLineColor

Returns the COLORVAL used for determining the color of the line.

Method SetLineColor

Sets the COLORVAL used for determining the color the line.

Examples

The following code snippet produces the PegLineChart pictured below.

PegLineChart * pLineChart = new PegLineChart(Rect, 0, 1000, 0, 1000, 100, 100); 
pLineChart->SetXLabelScale(200);  
pLineChart->SetExStyle(CS_DRAWXTICS | CS_DRAWYTICS | CS_DRAWXGRID | 
   CS_DRAWYGRID | CS_AUTOSIZE | CS_DRAWYLABELS | CS_DRAWXLABELS); 
pLineChart->AddPoint(100, 100);  
pLineChart->AddPoint(200, 200);  
pLineChart->AddPoint(300, 300);  
PegChartPoint * pPoint = pLineChart->AddPoint(400, 400);  
pLineChart->AddPoint(500, 500);  
pLineChart->AddPoint(600, 600);  
pLineChart->AddPoint(700, 800);  
pLineChart->InsertPoint(pPoint, 450, 0);

Class PegChart

Class PegMultiLineChart