Finishes fixing the arc to canvas drawing

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@1490 8e941d3f-bd1b-0410-a28a-d453659cc2b4

applications/fpvviewer/fpvectorialsrc/fpvtocanvas.pas

@@ -114,6 +114,7 @@ var
   CurCircle: TvCircle;
   CurEllipse: TvEllipse;
   CurArc: TvCircularArc;
+  FinalStartAngle, FinalEndAngle: double;
 begin
   {$ifdef FPVECTORIALDEBUG}
   WriteLn(':>DrawFPVectorialToCanvas');
@@ -198,14 +199,27 @@ begin
     begin
       CurArc := CurEntity as TvCircularArc;
       {$ifdef USE_LCL_CANVAS}
+      // ToDo: Consider a X axis inversion
+      // If the Y axis is inverted, then we need to mirror our angles as well
+      if AMulY > 0 then
+      begin
+        FinalStartAngle := CurArc.StartAngle;
+        FinalEndAngle := CurArc.EndAngle;
+      end
+      else // AMulY is negative
+      begin
+        // Inverting the angles generates the correct result for Y axis inversion
+        FinalStartAngle := 360 - 1* CurArc.EndAngle;
+        FinalEndAngle := 360 - 1* CurArc.StartAngle;
+      end;
       // Arc(ALeft, ATop, ARight, ABottom, Angle16Deg, Angle16DegLength: Integer);
       ADest.Arc(
         Round(ADestX + AmulX * (CurArc.CenterX - CurArc.Radius)),
         Round(ADestY + AmulY * (CurArc.CenterY - CurArc.Radius)),
         Round(ADestX + AmulX * (CurArc.CenterX + CurArc.Radius)),
         Round(ADestY + AmulY * (CurArc.CenterY + CurArc.Radius)),
-        Round(16*CurArc.StartAngle),
+        Round(16*FinalStartAngle),
-        Round(16*(CurArc.EndAngle - CurArc.StartAngle))
+        Round(16*(FinalEndAngle - FinalStartAngle))
         );
       {$endif}
     end;

applications/fpvviewer/fpvv_mainform.lfm

@@ -9,7 +9,7 @@ object frmFPVViewer: TfrmFPVViewer
   LCLVersion = '0.9.31'
   object editFileName: TFileNameEdit
     Left = 8
-    Height = 23
+    Height = 22
     Top = 8
     Width = 304
     DialogOptions = []
@@ -31,7 +31,7 @@ object frmFPVViewer: TfrmFPVViewer
   end
   object spinScale: TFloatSpinEdit
     Left = 72
-    Height = 23
+    Height = 16
     Top = 72
     Width = 64
     Increment = 1
@@ -42,23 +42,23 @@ object frmFPVViewer: TfrmFPVViewer
   end
   object Label1: TLabel
     Left = 8
-    Height = 16
+    Height = 17
     Top = 79
-    Width = 47
+    Width = 56
     Caption = 'Scale by:'
     ParentColor = False
   end
   object Label2: TLabel
     Left = 8
-    Height = 16
+    Height = 17
     Top = 104
-    Width = 60
+    Width = 73
     Caption = 'Start Pos X:'
     ParentColor = False
   end
   object spinStartX: TSpinEdit
     Left = 98
-    Height = 23
+    Height = 16
     Top = 99
     Width = 46
     MaxValue = 1000
@@ -67,7 +67,7 @@ object frmFPVViewer: TfrmFPVViewer
   end
   object spinStartY: TSpinEdit
     Left = 240
-    Height = 23
+    Height = 16
     Top = 99
     Width = 50
     MaxValue = 1000
@@ -76,9 +76,9 @@ object frmFPVViewer: TfrmFPVViewer
   end
   object Label3: TLabel
     Left = 152
-    Height = 16
+    Height = 17
     Top = 104
-    Width = 60
+    Width = 72
     Caption = 'Start Pos Y:'
     ParentColor = False
   end
@@ -97,35 +97,34 @@ object frmFPVViewer: TfrmFPVViewer
     AnchorSideBottom.Control = Owner
     AnchorSideBottom.Side = asrBottom
     Left = 0
-    Height = 340
+    Height = 345
     Top = 128
-    Width = 370
+    Width = 375
     PageIndex = 0
     Anchors = [akTop, akLeft, akRight, akBottom]
-    BorderSpacing.Right = 5
-    BorderSpacing.Bottom = 5
     TabOrder = 6
     TabStop = True
     object Page1: TPage
-      ClientWidth = 370
+      ClientWidth = 375
-      ClientHeight = 340
+      ClientHeight = 345
       object imageView: TImage
         AnchorSideRight.Control = Page1
         AnchorSideRight.Side = asrBottom
         AnchorSideBottom.Control = Page1
         AnchorSideBottom.Side = asrBottom
         Left = 8
-        Height = 327
+        Height = 332
         Top = 8
-        Width = 357
+        Width = 362
         Anchors = [akTop, akLeft, akRight, akBottom]
+        AutoSize = True
         BorderSpacing.Right = 5
         BorderSpacing.Bottom = 5
       end
     end
     object Page2: TPage
-      ClientWidth = 2688
+      ClientWidth = 21504
-      ClientHeight = 2504
+      ClientHeight = 20032
       object DXFTreeView: TTreeView
         Left = 8
         Height = 313

applications/fpvviewer/fpvv_mainform.pas

@@ -64,7 +64,13 @@ begin
     Vec.ReadFromFile(editFileName.FileName, vfDXF);
     imageView.Canvas.Brush.Color := clWhite;
     imageView.Canvas.FillRect(0, 0, imageView.Width, imageView.Height);
-    DrawFPVectorialToCanvas(Vec, imageView.Canvas, spinStartX.Value, spinStartY.Value, spinScale.Value, spinScale.Value);
+    DrawFPVectorialToCanvas(
+      Vec,
+      imageView.Canvas,
+      spinStartX.Value,
+      spinStartY.Value + imageView.Height,
+      spinScale.Value,
+      -1 * spinScale.Value);
   finally
     Vec.Free;
   end;