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{
Implements support for drawing to the LCL TCanvas via AggPas
License: The same modified LGPL as the Free Pascal RTL
See the file COPYING.modifiedLGPL for more details
AUTHORS: Felipe Monteiro de Carvalho
}
unit fpvectorial2aggpas;
{$ifdef fpc}
{$mode objfpc}{$h+}
{$endif}
{$define USE_CANVAS_CLIP_REGION}
{.$define DEBUG_CANVAS_CLIP_REGION}
{.$define FPVECTORIAL_DEBUG_DIMENSIONS}
{.$define FPVECTORIAL_TOCANVAS_DEBUG}
{.$define FPVECTORIAL_DEBUG_BLOCKS}
{.$define FPVECTORIAL_AUTOFIT_DEBUG}
{.$define FPVECTORIAL_SUPPORT_LAZARUS_1_6}
// visual debugs
{.$define FPVECTORIAL_TOCANVAS_ELLIPSE_VISUALDEBUG}
{.$define FPVECTORIAL_RENDERINFO_VISUALDEBUG}
interface
uses
Classes, SysUtils, Math, TypInfo, contnrs, types,
// FCL-Image
fpcanvas, fpimage, fpwritebmp,
// lazutils
laz2_dom,
// LCL
lazutf8, lazregions,
Graphics, LCLIntf, LCLType, intfgraphics, graphtype, interfacebase,
// AggPas
agg_fpimage, Agg_LCL,
// fpvectorial
fpvutils, fpvectorial;
type
{ TFPVAggPasRenderer }
TFPVAggPasRenderer = class(TvRenderer)
private
Bitmap: TBitmap;
AggLCLCanvas: TAggLCLCanvas;
public
procedure BeginRender(var ARenderInfo: TvRenderInfo; ADoDraw: Boolean); override;
procedure EndRender(var ARenderInfo: TvRenderInfo; ADoDraw: Boolean); override;
// TPath
procedure TPath_Render(var ARenderInfo: TvRenderInfo; ADoDraw: Boolean; APath: TPath); override;
end;
implementation
{ TFPVAggPasRenderer }
procedure TFPVAggPasRenderer.BeginRender(var ARenderInfo: TvRenderInfo; ADoDraw: Boolean);
var
HasFont: Boolean;
FontFilename: String;
begin
Bitmap := TBitmap.Create;
AggLCLCanvas:=TAggLCLCanvas.Create;
AggLCLCanvas.Image.PixelFormat:=afpimRGBA32;
AggLCLCanvas.Image.SetSize(2000, 2000);
{$IFDEF LCLGtk2}
{HasFont:=true;
FontFilename:=SetDirSeparators('../../verdana.ttf');
if not FileExistsUTF8(FontFilename) then begin
ShowMessage('file not found: '+FontFilename+' CurDir='+GetCurrentDirUTF8);
HasFont:=false;
end; }
// paint to agg canvas
{with AggLCLCanvas do begin
if HasFont then begin
Font.LoadFromFile(FontFilename);
Font.Size:=10;
Font.Color:=clBlack;
end;}
{$ELSE}
//HasFont:=false;
{$ENDIF}
// solid white background
AggLCLCanvas.Brush.Color:=clWhite;
AggLCLCanvas.FillRect(0, 0, AggLCLCanvas.Width, AggLCLCanvas.Height);
end;
procedure TFPVAggPasRenderer.EndRender(var ARenderInfo: TvRenderInfo; ADoDraw: Boolean);
begin
// convert to LCL native pixel format
Bitmap.LoadFromIntfImage(AggLCLCanvas.Image.IntfImg);
TCanvas(ARenderInfo.Canvas).Draw(0, 0, Bitmap);
AggLCLCanvas.Free;
Bitmap.Free;
end;
procedure TFPVAggPasRenderer.TPath_Render(var ARenderInfo: TvRenderInfo;
ADoDraw: Boolean; APath: TPath);
var
ADest: TFPCustomCanvas absolute ARenderInfo.Canvas;
ADestX: Integer absolute ARenderInfo.DestX;
ADestY: Integer absolute ARenderInfo.DestY;
AMulX: Double absolute ARenderInfo.MulX;
AMulY: Double absolute ARenderInfo.MulY;
//
i, j, curPt: Integer;
coordX, coordY: Integer;
curSegment: TPathSegment;
cur2DSegment: T2DSegment absolute curSegment;
pts: TPointsArray;
begin
if not ADoDraw then Exit;
AggLCLCanvas.Pen.Style := APath.Pen.Style;
AggLCLCanvas.Pen.Width := APath.Pen.Width;
AggLCLCanvas.Pen.FPColor := APath.Pen.Color;
AggLCLCanvas.Brush.Style := APath.Brush.Style;
AggLCLCanvas.Brush.FPColor := APath.Brush.Color;
AggLCLCanvas.Brush.AggFillEvenOdd := APath.ClipMode = vcmEvenOddRule;
AggLCLCanvas.AggResetPath;
APath.PrepareForSequentialReading;
for j := 0 to APath.Len - 1 do
begin
curSegment := TPathSegment(APath.Next);
case curSegment.SegmentType of
stMoveTo:
begin
inc(i);
coordX := CoordToCanvasX(cur2DSegment.X, ADestX, AMulX);
coordY := CoordToCanvasY(cur2DSegment.Y, ADestY, AMulY);
AggLCLCanvas.AggMoveTo(coordX, coordY);
end;
st2DLineWithPen, st2DLine, st3DLine:
begin
coordX := CoordToCanvasX(cur2DSegment.X, ADestX, AMulX);
coordY := CoordToCanvasY(cur2DSegment.Y, ADestY, AMulY);
if curSegment.SegmentType = st2DLineWithPen then
begin
AggLCLCanvas.Pen.FPColor := APath.AdjustColorToBackground(T2DSegmentWithPen(Cur2DSegment).Pen.Color, ARenderInfo);
AggLCLCanvas.Pen.Width := T2DSegmentWithPen(cur2DSegment).Pen.Width;
AggLCLCanvas.Pen.Style := T2DSegmentWithPen(cur2DSegment).Pen.Style;
AggLCLCanvas.AggLineTo(coordX, coordY);
AggLCLCanvas.Pen.Style := APath.Pen.Style;
AggLCLCanvas.Pen.Width := APath.Pen.Width;
AggLCLCanvas.Pen.FPColor := APath.Pen.Color;
end
else
AggLCLCanvas.AggLineTo(coordX, coordY);
end;
st2DBezier, st3DBezier, st2DEllipticalArc:
begin
coordX := CoordToCanvasX(T2DSegment(curSegment.Previous).X, ADestX, AMulX);
coordY := CoordToCanvasY(T2DSegment(curSegment.Previous).Y, ADestY, AMulY);
SetLength(pts, 1);
pts[0] := Point(coordX, coordY);
curSegment.AddToPoints(ADestX, ADestY, AMulX, AMulY, pts);
for curPt := 0 to Length(pts)-1 do
begin
AggLCLCanvas.AggLineTo(pts[curPt].X, pts[curPt].Y);
end;
AggLCLCanvas.AggMoveTo(pts[High(pts)].X, pts[High(pts)].Y);
end;
end;
end;
if APath.Len > 0 then
begin
AggLCLCanvas.AggClosePolygon;
AggLCLCanvas.AggDrawPath(AGG_FillAndStroke, False);
end;
end;
end.
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