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unit TAPolygonSeries;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, Graphics,
TAChartUtils, TADrawUtils, TACustomSeries, TALegend;
type
TPolygonSeries = class(TBasicPointSeries)
private
FBrush: TBrush;
FPen: TPen;
FPoints: array of TPoint;
FStart: array of Integer;
procedure SetBrush(AValue: TBrush);
procedure SetPen(AValue: TPen);
protected
procedure GetLegendItems(AItems: TChartLegendItems); override;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure Draw(ADrawer: IChartDrawer); override;
function GetNearestPoint(const AParams: TNearestPointParams;
out AResults: TNearestPointResults): Boolean; override;
published
property Brush: TBrush read FBrush write SetBrush;
property Pen: TPen read FPen write SetPen;
property ToolTargets default [nptPoint, nptCustom];
// inherited
property AxisIndexX;
property AxisIndexY;
property Source;
end;
implementation
uses
TAChartStrConsts, TAGeometry, TAGraph;
constructor TPolygonSeries.Create(AOwner: TComponent);
begin
inherited;
ToolTargets := [nptPoint, nptCustom];
FPen := TPen.Create;
FPen.OnChange := @StyleChanged;
FBrush := TBrush.Create;
FBrush.OnChange := @StyleChanged;
end;
destructor TPolygonSeries.Destroy;
begin
FPoints := nil;
FStart := nil;
FPen.Free;
FBrush.Free;
inherited;
end;
procedure TPolygonSeries.Draw(ADrawer: IChartDrawer);
const
START_BLOCKSIZE = 100;
var
ext: TDoubleRect;
ap, apStart: TDoublePoint; // axis units
gp: TDoublePoint; // graph units
pt: TPoint; // image units
nSource, nPoints: Integer;
nStart: Integer;
newPolygon: Boolean;
i, j: Integer;
procedure SavePolygonStartIndex(AIndex: Integer);
begin
if nStart mod START_BLOCKSIZE = 0 then
SetLength(FStart, Length(FStart) + START_BLOCKSIZE);
FStart[nStart] := AIndex;
inc(nStart);
end;
begin
if IsEmpty or (not Active) then
exit;
// Do not draw anything if the series extent does not intersect CurrentExtent.
with Extent do begin
ext.a := AxisToGraph(a);
ext.b := AxisToGraph(b);
end;
NormalizeRect(ext);
if not RectIntersectsRect(ext, ParentChart.CurrentExtent) then
exit;
nSource := Source.Count;
SetLength(FPoints, nSource);
SetLength(FStart, START_BLOCKSIZE);
nStart := 0;
nPoints := 0;
newPolygon := true;
for i := 0 to nSource-1 do begin
// a new polygon begins with the current index --> store index in array FStart[].
if newPolygon then begin
SavePolygonStartIndex(nPoints);
// Since the polygon ends if the start point is met again we must store the start point.
apStart := Source.Item[i]^.Point;
end;
// Get polygon point in image coordinates
ap := Source.Item[i]^.Point;
if IsRotated then
gp := DoublePoint(AxisToGraphX(ap.Y), AxisToGraphY(ap.X))
else
gp := AxisToGraph(ap);
pt := ParentChart.GraphToImage(gp);
// Store image point in FPoints array
FPoints[nPoints] := pt;
inc(nPoints);
// Current point coincides with the polygon start point
// --> polygon is closed, set flag "newPolygon" to be processed in next iteration
if (ap = apStart) then
newPolygon := not newPolygon;
end;
if nPoints = 0 then
exit;
// Single polygon --> we can use the standard Polygon() routine
if nStart = 1 then
begin
SetLength(FPoints, nPoints);
ADrawer.SetBrush(FBrush);
if FBrush.Color = clDefault then
ADrawer.SetBrushColor(FChart.GetDefaultColor(dctBrush))
else
ADrawer.SetBrushColor(FBrush.Color);
ADrawer.SetPen(FPen);
if FPen.Color = clDefault then
ADrawer.SetPenColor(FChart.GetDefaultColor(dctFont))
else
ADrawer.SetPenColor(FPen.Color);
ADrawer.Polygon(FPoints, 0, Length(FPoints));
exit;
end;
// If we get here we have multiple polygons. We must add points for a
// "clean retreat" to the starting point, and then we fill the borderless
// polygon and draw the border separately.
// Use length of FStart array as last array element for easier calculation
SavePolygonStartIndex(nPoints);
// Trim length of FStart array to occupied length
SetLength(FStart, nStart);
SetLength(FPoints, nPoints + Length(FStart) - 1);
j := nPoints;
for i := High(FStart) downto 1 do
begin
FPoints[j] := FPoints[FStart[i]];
inc(j);
end;
// Draw polygon fill
if FBrush.Style <> bsClear then
begin
ADrawer.SetBrush(FBrush);
if Brush.Color = clDefault then
ADrawer.SetBrushColor(FChart.GetDefaultColor(dctBrush))
else
ADrawer.SetBrushColor(Brush.Color);
ADrawer.SetPenParams(psClear, clTAColor);
ADrawer.Polygon(FPoints, 0, Length(FPoints));
end;
// Draw border
if FPen.Style <> psClear then
begin
ADrawer.Pen := FPen;
if FPen.Color = clDefault then
ADrawer.SetPenColor(FChart.GetDefaultColor(dctFont))
else
ADrawer.SetPenColor(FPen.Color);
for i := 0 to High(FStart) - 1 do
ADrawer.PolyLine(FPoints, FStart[i], FStart[i+1] - FStart[i]);
end;
end;
procedure TPolygonSeries.GetLegendItems(AItems: TChartLegendItems);
begin
GetLegendItemsRect(AItems, FBrush, FPen);
end;
{ Is overridden in order to detect tool events inside the polygon (nptCustom).
Otherwise only events on the perimenter would be detected. }
function TPolygonSeries.GetNearestPoint(const AParams: TNearestPointParams;
out AResults: TNearestPointResults): Boolean;
var
ext: TDoubleRect;
begin
Result := false;
AResults.FDist := sqr(AParams.FRadius) + 1;
AResults.FIndex := -1;
AResults.FXIndex := 0;
AResults.FYIndex := 0;
Result := inherited;
if Result or not ((nptCustom in AParams.FTargets) and (nptCustom in ToolTargets)) then
exit;
with Extent do begin
ext.a := AxisToGraph(a);
ext.b := AxisToGraph(b);
end;
NormalizeRect(ext);
// Do not do anything if the series extent does not intersect CurrentExtent.
if not RectIntersectsRect(ext, ParentChart.CurrentExtent) then
exit;
Result := IsPointInPolygon(AParams.FPoint, FPoints);
if Result then
begin
AResults.FDist := 0;
AResults.FIndex := 0;
AResults.FYIndex := 0;
AResults.FValue := ParentChart.ImageToGraph(AParams.FPoint);
AResults.FImg := AParams.FPoint;
end;
end;
procedure TPolygonSeries.SetBrush(AValue: TBrush);
begin
FBrush.Assign(AValue);
UpdateParentChart;
end;
procedure TPolygonSeries.SetPen(AValue: TPen);
begin
FPen.Assign(AValue);
UpdateParentChart;
end;
initialization
RegisterSeriesClass(TPolygonSeries, @rsPolygonSeries);
end.
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