|
1 // Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies). |
|
2 // All rights reserved. |
|
3 // This component and the accompanying materials are made available |
|
4 // under the terms of "Eclipse Public License v1.0" |
|
5 // which accompanies this distribution, and is available |
|
6 // at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
7 // |
|
8 // Initial Contributors: |
|
9 // Nokia Corporation - initial contribution. |
|
10 // |
|
11 // Contributors: |
|
12 // |
|
13 // Description: |
|
14 // |
|
15 |
|
16 #ifndef SWDIRECTGDIELLIPSE_H_ |
|
17 #define SWDIRECTGDIELLIPSE_H_ |
|
18 |
|
19 /** |
|
20 @file |
|
21 @internalComponent |
|
22 */ |
|
23 |
|
24 #include <e32std.h> |
|
25 #include <gdi.h> |
|
26 |
|
27 /** |
|
28 A utility class to efficiently draw and fill ellipses |
|
29 */ |
|
30 class TSwDirectGdiEllipse |
|
31 { |
|
32 public: |
|
33 /** |
|
34 Enumeration for the ellipse production life cycle |
|
35 */ |
|
36 enum TEllipseStatus |
|
37 { |
|
38 /** |
|
39 Ellipse has been initialised but has no area |
|
40 */ |
|
41 EInitialised, |
|
42 /** |
|
43 The ellipse is drawn as two parabolas. These are in two sectors, the top and bottom |
|
44 half of the rectangle. The first sector means the top parabola has been produced. |
|
45 */ |
|
46 EFirstSector, |
|
47 /** |
|
48 The parabola that occupies the bottom half of the rectangle has been produced. |
|
49 */ |
|
50 ESecondSector, |
|
51 /** |
|
52 The ellipse is complete |
|
53 */ |
|
54 EComplete, |
|
55 /** |
|
56 The ellipse has either a height or width of two units or less |
|
57 and so takes the appearance of a line |
|
58 */ |
|
59 ELine |
|
60 }; |
|
61 public: |
|
62 void Construct(const TRect& aRect); |
|
63 TBool SingleStep(TPoint& aTopLeft,TPoint& aTopRight,TPoint& aBottomLeft,TPoint& aBottomRight); |
|
64 TBool NextStep(TPoint& aTopLeft,TPoint& aTopRight,TPoint& aBottomLeft,TPoint& aBottomRight); |
|
65 TPoint Intersection(const TRect& aRect,const TPoint& aPoint); |
|
66 protected: |
|
67 TBool Output(TPoint& aTopLeft,TPoint& aTopRight,TPoint& aBottomLeft,TPoint& aBottomRight); |
|
68 protected: |
|
69 TEllipseStatus iStatus; |
|
70 TInt iA; |
|
71 TInt iB; |
|
72 TInt64 iASquared; |
|
73 TInt64 iBSquared; |
|
74 TInt64 iASquBSqu; |
|
75 TInt iX; |
|
76 TInt iY; |
|
77 TInt iXAdj; |
|
78 TInt iYAdj; |
|
79 TPoint iOffset; |
|
80 TInt64 iD1; |
|
81 TInt64 iD2; |
|
82 }; |
|
83 |
|
84 #endif /*SWDIRECTGDIELLIPSE_H_*/ |