Index: /trunk/ab5.0/ablib/src/basic/prompt.sbp
===================================================================
--- /trunk/ab5.0/ablib/src/basic/prompt.sbp	(revision 687)
+++ /trunk/ab5.0/ablib/src/basic/prompt.sbp	(revision 688)
@@ -632,8 +632,6 @@
 'Prompt graphic command functions
 
-Sub Circle(x As Long , y As Long, radius As Double, ColorCode As Long, StartPos As Double, EndPos As Double, Aspect As Double, bFill As Long, BrushColor As Long)
-	Dim i1 As Long, i2 As Long, i3 As Long, i4 As Long
-
-	Dim hPen = CreatePen(PS_SOLID,1,GetBasicColor(ColorCode))
+Sub Circle(x As Double, y As Double, radius As Double, ColorCode As Long, StartPos As Double, EndPos As Double, Aspect As Double, bFill As Long, BrushColor As Long)
+	Dim hPen = CreatePen(PS_SOLID, 1, GetBasicColor(ColorCode))
 	Dim hBrush As HBRUSH
 	If bFill Then
@@ -643,90 +641,59 @@
 	End If
 
-	Dim hDC = GetDC(_PromptSys_hWnd)
-	Dim hOldPenDC = SelectObject(hDC, hPen)
-	Dim hOldBrushDC = SelectObject(hDC, hBrush)
+	Dim hdc = GetDC(_PromptSys_hWnd)
+	Dim hOldPenDC = SelectObject(hdc, hPen)
+	Dim hOldBrushDC = SelectObject(hdc, hBrush)
 	Dim hOldPen = SelectObject(_PromptSys_hMemDC, hPen)
 	Dim hOldBrush = SelectObject(_PromptSys_hMemDC, hBrush)
 
-	Dim radi2 As Long
-	Dim iRadius As Long
-	If Aspect<1 Then
-		radi2 = (radius * Aspect) As Long
-		iRadius = radius As Long
+	Dim yRadius As Double
+	Dim xRadius As Double
+	If Aspect = 1 Then
+		yRadius = radius
+		xRadius = radius
+	ElseIf Aspect < 1 Then
+		yRadius = radius * Aspect
+		xRadius = radius
 	Else
-		radi2 = radius As Long
-		iRadius = (radius / Aspect) As Long
-	End If
-
-	If StartPos=0 And EndPos=0 Then
-		Ellipse(hDC,x-iRadius,y-radi2,x+iRadius,y+radi2)
-		Ellipse(_PromptSys_hMemDC,x-iRadius,y-radi2,x+iRadius,y+radi2)
+		yRadius = radius
+		xRadius = radius / Aspect
+	End If
+
+	Dim x1 = (x - xRadius) As Long
+	Dim x2 = (x + xRadius) As Long
+	Dim y1 = (y - yRadius) As Long
+	Dim y2 = (y + yRadius) As Long
+
+	If StartPos = 0 And EndPos = 0 Then
+		Ellipse(hdc, x1, y1, x2, y2)
+		Ellipse(_PromptSys_hMemDC, x1, y1, x2, y2)
 	Else
-		Dim sw As Boolean
-		StartPos *= 100
-		EndPos *= 100
-
-		If StartPos<0 Or EndPos<0 Then
-			sw = True
+		Dim isPie As Boolean
+		If StartPos < 0 Or EndPos < 0 Then
+			isPie = True
 			StartPos = Math.Abs(StartPos)
 			EndPos = Math.Abs(EndPos)
 		Else
-			sw = False
+			isPie = False
 		End If
 
-		If StartPos<=78.5 Then
-			i1=78
-			i2=Int(StartPos)
-		ElseIf StartPos<=235.5 Then
-			StartPos -= 78.5
-			i1=78-Int(StartPos)
-			i2=78
-		ElseIf StartPos<=392.5 Then
-			StartPos -= 235.5
-			i1=-78
-			i2=78-Int(StartPos)
-		ElseIf StartPos<=549.5 Then
-			StartPos -= 392.5
-			i1=-78+Int(StartPos)
-			i2=-78
-		ElseIf StartPos<=628 Then
-			StartPos -= 549.5
-			i1=78
-			i2=-78+Int(StartPos)
+		Dim scaleRadial = (x + y) * 0.5
+		Dim startX = (x + ActiveBasic.Math.Cos(StartPos) * scaleRadial) As Long
+		Dim startY = (y - ActiveBasic.Math.Sin(StartPos) * scaleRadial) As Long
+		Dim endX = (x + ActiveBasic.Math.Cos(EndPos) * scaleRadial) As Long
+		Dim endY = (y - ActiveBasic.Math.Sin(EndPos) * scaleRadial) As Long
+
+		If isPie Then
+			Pie(hdc, x1, y1, x2, y2, startX, startY, endX, endY)
+			Pie(_PromptSys_hMemDC, x1, y1, x2, y2, startX, startY, endX, endY)
+		Else
+			Arc(hdc, x1, y1, x2, y2, startX, startY, endX, endY)
+			Arc(_PromptSys_hMemDC, x1, y1, x2, y2, startX, startY, endX, endY)
 		End If
-
-		If EndPos<=78.5 Then
-			i3=78
-			i4=Int(EndPos)
-		ElseIf EndPos<=235.5 Then
-			EndPos -= 78.5
-			i3=78-Int(EndPos)
-			i4=78
-		ElseIf EndPos<=392.5 Then
-			EndPos -= 235.5
-			i3=-78
-			i4=78-Int(EndPos)
-		ElseIf EndPos<=549.5 Then
-			EndPos -= 392.5
-			i3=-78+Int(EndPos)
-			i4=-78
-		ElseIf EndPos<=628 Then
-			EndPos -= 549.5
-			i3=78
-			i4=-78+Int(EndPos)
-		End If
-
-		If sw Then
-			Pie(hDC,x-iRadius,y-radi2,x+iRadius,y+radi2, x+i1,y-i2,x+i3,y-i4)
-			Pie(_PromptSys_hMemDC,x-iRadius,y-radi2,x+iRadius,y+radi2, x+i1,y-i2,x+i3,y-i4)
-		Else
-			Arc(hDC,x-iRadius,y-radi2,x+iRadius,y+radi2, x+i1,y-i2,x+i3,y-i4)
-			Arc(_PromptSys_hMemDC,x-iRadius,y-radi2,x+iRadius,y+radi2, x+i1,y-i2,x+i3,y-i4)
-		End If
-	End If
-
-	SelectObject(hDC, hOldPenDC)
-	SelectObject(hDC, hOldBrushDC)
-	ReleaseDC(_PromptSys_hWnd, hDC)
+	End If
+
+	SelectObject(hdc, hOldPenDC)
+	SelectObject(hdc, hOldBrushDC)
+	ReleaseDC(_PromptSys_hWnd, hdc)
 	SelectObject(_PromptSys_hMemDC, hOldPen)
 	SelectObject(_PromptSys_hMemDC, hOldBrush)
@@ -912,5 +879,5 @@
 	'呼び出し方法は以下のようになります（コンパイラがパラメータの並びを最適化します）
 	'Circle (x, y), radius [, color] [, start] [, end] [, aspect] [, f] [, color2]
-	ActiveBasic.Prompt.Detail.Circle(x As Long, y As Long, radius, ColorCode, StartPos, EndPos, Aspect, bFill, BrushColor)
+	ActiveBasic.Prompt.Detail.Circle(x, y, radius, ColorCode, StartPos, EndPos, Aspect, bFill, BrushColor)
 End Macro