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Starts supporting DXF POLYLINE

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git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@1543 8e941d3f-bd1b-0410-a28a-d453659cc2b4
This commit is contained in:
sekelsenmat
2011-03-31 10:53:47 +00:00
parent a48578d736
commit 9ba91cef51
2 changed files with 104 additions and 13 deletions
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102
applications/fpvviewer/fpvectorialsrc/dxfvectorialreader.pas
View File

@ -72,6 +72,9 @@ type
INSBASE, EXTMIN, EXTMAX, LIMMIN, LIMMAX: T3DPoint;
// Calculated HEADER data
DOC_OFFSET: T3DPoint;
// For building the POLYLINE objects which is composed of multiple records
IsReadingPolyline: Boolean;
PolylineX, PolylineY: array of Double;
//
function SeparateString(AString: string; ASeparator: Char): T10Strings;
procedure ReadHEADER(ATokens: TDXFTokens; AData: TvVectorialDocument);
@ -84,6 +87,9 @@ type
procedure ReadENTITIES_TEXT(ATokens: TDXFTokens; AData: TvVectorialDocument);
procedure ReadENTITIES_LWPOLYLINE(ATokens: TDXFTokens; AData: TvVectorialDocument);
procedure ReadENTITIES_SPLINE(ATokens: TDXFTokens; AData: TvVectorialDocument);
procedure ReadENTITIES_POLYLINE(ATokens: TDXFTokens; AData: TvVectorialDocument);
procedure ReadENTITIES_VERTEX(ATokens: TDXFTokens; AData: TvVectorialDocument);
procedure ReadENTITIES_SEQEND(ATokens: TDXFTokens; AData: TvVectorialDocument);
function GetCoordinateValue(AStr: shortstring): Double;
public
{ General reading methods }
@ -428,6 +434,8 @@ var
i: Integer;
CurToken: TDXFToken;
begin
IsReadingPolyline := False;
for i := 0 to ATokens.Count - 1 do
begin
CurToken := TDXFToken(ATokens.Items[i]);
@ -437,8 +445,20 @@ begin
else if CurToken.StrValue = 'ELLIPSE' then ReadENTITIES_ELLIPSE(CurToken.Childs, AData)
else if CurToken.StrValue = 'LINE' then ReadENTITIES_LINE(CurToken.Childs, AData)
else if CurToken.StrValue = 'TEXT' then ReadENTITIES_TEXT(CurToken.Childs, AData)
// else if CurToken.StrValue = 'LWPOLYLINE' then ReadENTITIES_LWPOLYLINE(CurToken.Childs, AData)
else if CurToken.StrValue = 'LWPOLYLINE' then ReadENTITIES_LWPOLYLINE(CurToken.Childs, AData)
else if CurToken.StrValue = 'SPLINE' then ReadENTITIES_SPLINE(CurToken.Childs, AData)
// A Polyline can have multiple child objects
else if CurToken.StrValue = 'POLYLINE' then
begin
IsReadingPolyline := True;
ReadENTITIES_POLYLINE(CurToken.Childs, AData);
end
else if CurToken.StrValue = 'VERTEX' then ReadENTITIES_VERTEX(CurToken.Childs, AData)
else if CurToken.StrValue = 'SEQEND' then
begin
ReadENTITIES_SEQEND(CurToken.Childs, AData);
IsReadingPolyline := False;
end
else
begin
// ...
@ -888,7 +908,7 @@ begin
AData.AddText(PosX, PosY, PosZ, '', Round(FontSize), Str);
end;
{$define FPVECTORIALDEBUG_LWPOLYLINE}
//{$define FPVECTORIALDEBUG_LWPOLYLINE}
procedure TvDXFVectorialReader.ReadENTITIES_LWPOLYLINE(ATokens: TDXFTokens;
AData: TvVectorialDocument);
var
@ -949,13 +969,14 @@ begin
end;
end;
{$define FPVECTORIALDEBUG_SPLINE}
procedure TvDXFVectorialReader.ReadENTITIES_SPLINE(ATokens: TDXFTokens;
AData: TvVectorialDocument);
var
CurToken: TDXFToken;
i, curPoint: Integer;
// LINE
LineX, LineY, LineZ: array of Double;
LineX, LineY{, LineZ}: array of Double;
begin
curPoint := -1;
@ -992,17 +1013,86 @@ begin
if curPoint >= 0 then // otherwise the polyline is empty of points
begin
AData.StartPath(LineX[0], LineY[0]);
{$ifdef FPVECTORIALDEBUG_LWPOLYLINE}
{$ifdef FPVECTORIALDEBUG_SPLINE}
Write(Format('SPLINE %f,%f', [LineX[0], LineY[0]]));
{$endif}
for i := 1 to curPoint do
begin
AData.AddLineToPath(LineX[i], LineX[i]);
{$ifdef FPVECTORIALDEBUG_LWPOLYLINE}
{$ifdef FPVECTORIALDEBUG_SPLINE}
Write(Format(' %f,%f', [LineX[i], LineX[i]]));
{$endif}
end;
{$ifdef FPVECTORIALDEBUG_LWPOLYLINE}
{$ifdef FPVECTORIALDEBUG_SPLINE}
WriteLn('');
{$endif}
AData.EndPath();
end;
end;
procedure TvDXFVectorialReader.ReadENTITIES_POLYLINE(ATokens: TDXFTokens;
AData: TvVectorialDocument);
begin
SetLength(PolylineX, 0);
SetLength(PolylineY, 0);
end;
procedure TvDXFVectorialReader.ReadENTITIES_VERTEX(ATokens: TDXFTokens;
AData: TvVectorialDocument);
var
CurToken: TDXFToken;
i, curPoint: Integer;
begin
if not IsReadingPolyline then raise Exception.Create('[TvDXFVectorialReader.ReadENTITIES_VERTEX] Unexpected record: VERTEX before a POLYLINE');
curPoint := Length(PolylineX);
Inc(curPoint);
SetLength(PolylineX, curPoint+1);
SetLength(PolylineY, curPoint+1);
for i := 0 to ATokens.Count - 1 do
begin
// Now read and process the item name
CurToken := TDXFToken(ATokens.Items[i]);
// Avoid an exception by previously checking if the conversion can be made
if CurToken.GroupCode in [10, 20, 30] then
begin
CurToken.FloatValue := StrToFloat(Trim(CurToken.StrValue), FPointSeparator);
end;
// Loads the coordinates
// With Position fixing for documents with negative coordinates
case CurToken.GroupCode of
10: PolylineX[curPoint] := CurToken.FloatValue - DOC_OFFSET.X;
20: PolylineY[curPoint] := CurToken.FloatValue - DOC_OFFSET.Y;
end;
end;
end;
{$define FPVECTORIALDEBUG_POLYLINE}
procedure TvDXFVectorialReader.ReadENTITIES_SEQEND(ATokens: TDXFTokens;
AData: TvVectorialDocument);
var
i: Integer;
begin
if not IsReadingPolyline then raise Exception.Create('[TvDXFVectorialReader.ReadENTITIES_SEQEND] Unexpected record: SEQEND before a POLYLINE');
// Write the Polyline to the document
if Length(PolylineX) >= 0 then // otherwise the polyline is empty of points
begin
AData.StartPath(PolylineX[0], PolylineY[0]);
{$ifdef FPVECTORIALDEBUG_POLYLINE}
Write(Format('POLYLINE %f,%f', [PolylineX[0], PolylineY[0]]));
{$endif}
for i := 1 to Length(PolylineX) do
begin
AData.AddLineToPath(PolylineX[i], PolylineY[i]);
{$ifdef FPVECTORIALDEBUG_POLYLINE}
Write(Format(' %f,%f', [PolylineX[i], PolylineY[i]]));
{$endif}
end;
{$ifdef FPVECTORIALDEBUG_POLYLINE}
WriteLn('');
{$endif}
AData.EndPath();

15
applications/fpvviewer/fpvv_mainform.lfm
View File

@ -11,7 +11,7 @@ object frmFPVViewer: TfrmFPVViewer
LCLVersion = '0.9.31'
object editFileName: TFileNameEdit
Left = 8
Height = 23
Height = 25
Top = 8
Width = 304
DialogOptions = []
@ -33,9 +33,10 @@ object frmFPVViewer: TfrmFPVViewer
end
object spinScale: TFloatSpinEdit
Left = 72
Height = 23
Height = 25
Top = 72
Width = 64
Width = 168
DecimalPlaces = 6
Increment = 1
MaxValue = 100
MinValue = 0
@ -44,9 +45,9 @@ object frmFPVViewer: TfrmFPVViewer
end
object Label1: TLabel
Left = 8
Height = 16
Height = 18
Top = 79
Width = 47
Width = 58
Caption = 'Scale by:'
ParentColor = False
end
@ -75,8 +76,8 @@ object frmFPVViewer: TfrmFPVViewer
object pageViewer: TPage
end
object Page2: TPage
ClientWidth = 86016
ClientHeight = 80128
ClientWidth = 132
ClientHeight = 156
object DXFTreeView: TTreeView
Left = 8
Height = 313