36 TPoint& aViewPortTopLeft, |
36 TPoint& aViewPortTopLeft, |
37 TGlxPanIncrementType aPanIncrement, |
37 TGlxPanIncrementType aPanIncrement, |
38 TBool* aThresholdReached = NULL); |
38 TBool* aThresholdReached = NULL); |
39 |
39 |
40 /** |
40 /** |
41 * Starts zooming In/out with slider/Keys |
41 * Recalculates the new TL and Dimension values for the viewport to be drawn after a new Zoom Operation |
42 * @ param aMfactor:The Zooming factor with which image has to be zoomed |
42 * @ param aZoomMode : Are we Zooming In our out. Ignored when aExpectedZoomRatio |
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43 * has a non zero value |
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44 * @ param aExpectedZoomRatio : When we need zooming to a particular finite value. |
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45 * Generally for Slider based zoom. |
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46 * @ param aViewPortTopLeft: The new TL location of the viewport after zooming |
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47 * @ param aViewPortDimension: The new dimensions of the viewport after zooming |
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48 * @ param apThresholdReached : Optional parameter. If present, indicates whether we |
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49 * have reached a limit while zooming. |
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50 * @ param apZoomFocus: Optional parameter. If present, indicates the point |
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51 * around wich zooming happens, (offcenter zoom) |
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52 * @ param aRelativeZoomFactor: Percentage of zoom in relation to the previous value. |
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53 * useful in pinch zoom. If this is greater than 0, |
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54 * the first 2 parameters are ignored |
43 */ |
55 */ |
44 TInt Zoom( TZoomMode aZoomMode, // Ignored when aExpectedZoomRatio has a value |
56 TInt Zoom( TZoomMode aZoomMode, // Ignored when aExpectedZoomRatio has a value |
45 TInt aExpectedZoomRatio, // only for slider based zoom. = 0 for key based zoom. |
57 TInt aExpectedZoomRatio, // only for slider based zoom. = 0 for key based zoom. |
46 TPoint& aViewPortTopLeft, |
58 TPoint& aViewPortTopLeft, |
47 TSize& aViewPortDimension, |
59 TSize& aViewPortDimension, |
48 TBool* apThresholdReached = NULL, |
60 TBool* apThresholdReached = NULL, |
49 TPoint* apZoomFocus = NULL, |
61 TPoint* apZoomFocus = NULL, |
50 TInt aRelativeZoomFactor = 0); |
62 TInt aRelativeZoomFactor = 0); |
51 |
63 |
52 // Initialize |
64 /** |
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65 * Initialize the Maths engine |
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66 * @ param aCenter: The center of the VP(View Port) |
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67 * @ param aScreenSize: Screensize of the device. |
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68 * @ param aImageSize: Size of the image. |
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69 * @ param aOriginalZoomedDimensions:The Original zoomed dimension. |
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70 * @ param aInitialZoomRatio:Initial zoom ratio. |
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71 */ |
53 void Initialize(TPoint& aCenter, |
72 void Initialize(TPoint& aCenter, |
54 TSize& aScreenSize, |
73 TSize& aScreenSize, |
55 TSize& aImageSize, |
74 TSize& aImageSize, |
56 TSize& aOriginalZoomedDimensions, |
75 TSize& aOriginalZoomedDimensions, |
57 TUint8 aInitialZoomRatio); |
76 TUint8 aInitialZoomRatio); |
58 |
77 |
59 void UpdatePanFactor(TTime& aPanTime); |
78 /** |
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79 * UpdatePanFactor [Useful only in Key-based Panning] |
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80 */ |
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81 void UpdatePanFactor(); |
60 |
82 |
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83 /** |
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84 * Indicates change of orientation. |
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85 * @ param aNewScreenRect: New Screen size |
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86 */ |
61 // this can have a more generic name. but now it informs only abt screen orientation changes. and hence the name |
87 // this can have a more generic name. but now it informs only abt screen orientation changes. and hence the name |
62 void OrientationChanged(const TRect& aNewScreenRect); |
88 void OrientationChanged(const TRect& aNewScreenRect); |
63 |
89 |
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90 /** |
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91 * Retrieves the Image Virtual Size |
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92 */ |
64 TSize ImageVirtualSize(); |
93 TSize ImageVirtualSize(); |
65 |
94 |
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95 /** |
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96 * Retrieves the Image Virtual Size |
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97 */ |
66 TSize ScreenSize(); |
98 TSize ScreenSize(); |
67 |
99 |
68 TInt NewCenterCoordinate(TInt Center, |
100 /** |
69 TInt Offset, |
101 * Retrieves the New Center Coordinate on one axis. |
70 TUint16 HalfScreenDimension, |
102 * Needs to be called twice for both axes. |
71 TInt MinimumCoordinate, |
103 * @ param aCenter: The Center of the VP. |
72 TInt MaximumCoordinate, |
104 * @ param aOffset: The offset along one axis if we have paned |
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105 * @ param aHalfScreenDimension: Half the screen dimension along this axis. |
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106 * @ param aMinimumCoordinate: Minimum possible coordinate along this axis. Usually 0. |
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107 * @ param aMaximumCoordinate: Maximum possible coordinate along this axis. |
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108 * @ param aLimitReached: Indicates if we have reached a limit while zooming/Panning. |
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109 */ |
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110 TInt NewCenterCoordinate(TInt aCenter, |
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111 TInt aOffset, |
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112 TUint16 aHalfScreenDimension, |
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113 TInt aMinimumCoordinate, |
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114 TInt aMaximumCoordinate, |
73 TBool *aLimitReached = NULL) ; |
115 TBool *aLimitReached = NULL) ; |
74 |
116 |
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117 /** |
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118 * Begin the pan operation |
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119 */ |
75 void SetupPanOperation(); |
120 void SetupPanOperation(); |
76 |
121 |
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122 /** |
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123 * Retrieves the latest ofset by which we panned |
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124 */ |
77 TPoint LastPanOffset(); |
125 TPoint LastPanOffset(); |
78 |
126 |
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127 /** |
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128 * Retrieves the minimum zoom ratio with which we stay in zoomode |
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129 */ |
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130 TInt MinimumZoomRatio(); |
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131 |
79 private: |
132 private: |
80 |
133 |
81 /** |
134 /** |
82 * Get the next Zoomlevel on the basis of Zoom In/Out |
135 * Get the next Zoomlevel on the basis of Zoom In/Out |
83 * @ param aZoomMode:Specifies the zoomode,whether it is Zoom In/Out |
136 * @ param aZoomMode:Specifies the zoomode,whether it is Zoom In/Out |