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{
Implements support for drawing to the LCL TCanvas
License: The same modified LGPL as the Free Pascal RTL
See the file COPYING.modifiedLGPL for more details
AUTHORS: Felipe Monteiro de Carvalho
}
unit fpvectorial2canvas;
{$ifdef fpc}
{$mode objfpc}{$h+}
{$endif}
{$define USE_CANVAS_CLIP_REGION}
{.$define DEBUG_CANVAS_CLIP_REGION}
{$define USE_LCL_CANVAS}
{.$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,
// fpvectorial
fpvutils, fpvectorial;
type
{ TFPVCanvasRenderer }
TFPVCanvasRenderer = class(TvRenderer)
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
{ TFPVCanvasRenderer }
procedure TFPVCanvasRenderer.BeginRender(var ARenderInfo: TvRenderInfo;
ADoDraw: Boolean);
begin
end;
procedure TFPVCanvasRenderer.EndRender(var ARenderInfo: TvRenderInfo;
ADoDraw: Boolean);
begin
end;
procedure TFPVCanvasRenderer.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: Integer;
j, n: Integer;
x1, y1, x2, y2: Integer;
pts: TPointsArray;
ACanvas: TCanvas absolute ARenderInfo.Canvas;
coordX, coordY: Integer;
curSegment: TPathSegment;
cur2DSegment: T2DSegment absolute curSegment;
lRect: TRect;
gv1, gv2: T2DPoint;
begin
with APath do begin
ConvertPathToPolygons(APath, ADestX, ADestY, AMulX, AMulY, FPolyPoints, FPolyStarts);
x1 := MaxInt;
y1 := maxInt;
x2 := -MaxInt;
y2 := -MaxInt;
for i := 0 to High(FPolyPoints) do
begin
{$ifdef FPVECTORIAL_AUTOFIT_DEBUG}
if AutoFitDebug <> nil then AutoFitDebug.Add(Format('==[%d=%d]', [FPolyPoints[i].X, FPolyPoints[i].Y]));
{$endif}
x1 := min(x1, FPolyPoints[i].X);
y1 := min(y1, FPolyPoints[i].Y);
x2 := max(x2, FPolyPoints[i].X);
y2 := max(y2, FPolyPoints[i].Y);
end;
CalcEntityCanvasMinMaxXY_With2Points(ARenderInfo, x1, y1, x2, y2);
// Boundary rect of shape filled with a gradient
lRect := Rect(x1, y1, x2, y2);
if ADoDraw then
begin
// (1) draw background only
ADest.Pen.Style := psClear;
if (Length(FPolyPoints) > 2) then
case Brush.Kind of
bkSimpleBrush:
if Brush.Style <> bsClear then
begin
if (Brush.Style = bsSolid) and (Length(FPolyStarts) > 1) then
// Non-contiguous polygon (polygon with "holes") --> use special procedure
// Disadvantage: it can only do solid fills!
APath.DrawPolygon(ARenderInfo, FPolyPoints, FPolyStarts, lRect)
else
{$IFDEF USE_LCL_CANVAS}
for i := 0 to High(FPolyStarts) do
begin
j := FPolyStarts[i];
if i = High(FPolyStarts) then
n := Length(FPolyPoints) - j
else
n := FPolyStarts[i+1] - FPolyStarts[i]; // + 1;
ACanvas.Polygon(@FPolyPoints[j], n, WindingRule = vcmNonZeroWindingRule);
end;
{$ELSE}
ADest.Polygon(FPolyPoints);
{$ENDIF}
end;
bkHorizontalGradient,
bkVerticalGradient,
bkOtherLinearGradient:
begin
// calculate gradient vector
CalcGradientVector(gv1, gv2, lRect, ADestX, ADestY, AMulX, AMulY);
// Draw the gradient
DrawPolygonBrushLinearGradient(ARenderInfo, FPolyPoints, FPolyStarts, lRect, gv1, gv2);
end;
bkRadialGradient:
DrawPolygonBrushRadialGradient(ARenderInfo, FPolyPoints, lRect);
end; // case Brush.Kind of...
// (2) draw border, take care of the segments with modified pen
ADest.Brush.Style := bsClear; // We will paint no background
ApplyPenToCanvas(ARenderInfo, Pen); // Restore pen
PrepareForSequentialReading;
for j := 0 to Len - 1 do
begin
curSegment := TPathSegment(Next);
case curSegment.SegmentType of
stMoveTo:
begin
inc(i);
coordX := CoordToCanvasX(cur2DSegment.X, ADestX, AMulX);
coordY := CoordToCanvasY(cur2DSegment.Y, ADestY, AMulY);
ADest.MoveTo(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
ADest.Pen.FPColor := AdjustColorToBackground(T2DSegmentWithPen(Cur2DSegment).Pen.Color, ARenderInfo);
ADest.Pen.Width := T2DSegmentWithPen(cur2DSegment).Pen.Width;
ADest.Pen.Style := T2DSegmentWithPen(cur2DSegment).Pen.Style;
ADest.LineTo(coordX, coordY);
ApplyPenToCanvas(ARenderInfo, Pen);
end else
ADest.LineTo(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);
if Length(pts) > 0 then
begin
ADest.PolyLine(pts);
ADest.MoveTo(pts[High(pts)].X, pts[High(pts)].Y);
end;
end;
end;
end;
end;
end;
end;
initialization
RegisterDefaultRenderer(TFPVCanvasRenderer);
end.
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