| 50 |
50 |
mDragging = true;
|
| 51 |
51 |
delete mRubberBand;
|
| 52 |
52 |
mRubberBand = new QgsRubberBand( mCanvas, true );
|
| 53 |
|
mZoomRect.setTopLeft( e->pos() );
|
|
53 |
// the starting point is already captured
|
| 54 |
54 |
}
|
| 55 |
55 |
mZoomRect.setBottomRight( e->pos() );
|
| 56 |
56 |
if ( mRubberBand )
|
| ... | ... | |
| 66 |
66 |
if ( e->button() != Qt::LeftButton )
|
| 67 |
67 |
return;
|
| 68 |
68 |
|
| 69 |
|
mZoomRect.setRect( 0, 0, 0, 0 );
|
|
69 |
// store the starting point
|
|
70 |
mZoomRect.setRect( e->pos().x(), e->pos().y(), 0, 0 );
|
| 70 |
71 |
}
|
| 71 |
72 |
|
| 72 |
73 |
|
| ... | ... | |
| 75 |
76 |
if ( e->button() != Qt::LeftButton )
|
| 76 |
77 |
return;
|
| 77 |
78 |
|
|
79 |
// ctrl key reverses zoom direction
|
|
80 |
bool isZoomOut = ( e->modifiers() & Qt::ControlModifier ) ? ! mZoomOut : mZoomOut;
|
|
81 |
|
| 78 |
82 |
if ( mDragging )
|
| 79 |
83 |
{
|
| 80 |
84 |
mDragging = false;
|
| ... | ... | |
| 82 |
86 |
mRubberBand = 0;
|
| 83 |
87 |
|
| 84 |
88 |
// store the rectangle
|
| 85 |
|
mZoomRect.setRight( e->pos().x() );
|
| 86 |
|
mZoomRect.setBottom( e->pos().y() );
|
| 87 |
|
|
| 88 |
|
const QgsMapToPixel* coordinateTransform = mCanvas->getCoordinateTransform();
|
| 89 |
|
|
| 90 |
|
// set the extent to the zoomBox
|
| 91 |
|
QgsPoint ll = coordinateTransform->toMapCoordinates( mZoomRect.left(), mZoomRect.bottom() );
|
| 92 |
|
QgsPoint ur = coordinateTransform->toMapCoordinates( mZoomRect.right(), mZoomRect.top() );
|
|
89 |
mZoomRect.setBottomRight( e->pos() );
|
| 93 |
90 |
|
| 94 |
|
QgsRectangle r;
|
| 95 |
|
r.setXMinimum( ll.x() );
|
| 96 |
|
r.setYMinimum( ll.y() );
|
| 97 |
|
r.setXMaximum( ur.x() );
|
| 98 |
|
r.setYMaximum( ur.y() );
|
| 99 |
|
r.normalize();
|
|
91 |
// before getting map coords
|
|
92 |
mZoomRect = mZoomRect.normalized();
|
| 100 |
93 |
|
| 101 |
94 |
// prevent zooming to an empty extent
|
| 102 |
|
if ( r.width() == 0 || r.height() == 0 )
|
|
95 |
if ( mZoomRect.width() == 0)
|
|
96 |
{
|
|
97 |
mZoomRect.setWidth( 1 );
|
|
98 |
}
|
|
99 |
if ( mZoomRect.height() == 0 )
|
| 103 |
100 |
{
|
| 104 |
|
return;
|
|
101 |
mZoomRect.setHeight( 1 );
|
| 105 |
102 |
}
|
| 106 |
103 |
|
| 107 |
|
if ( mZoomOut )
|
|
104 |
const QgsMapToPixel* coordinateTransform = mCanvas->getCoordinateTransform();
|
|
105 |
|
|
106 |
// set the extent to the zoomBox
|
|
107 |
// Need to adjust the right and bottom to account for integer values equating to one edge of a pixel.
|
|
108 |
// This gets the outside of the zoom rectangle.
|
|
109 |
QgsPoint ll = coordinateTransform->toMapCoordinates( mZoomRect.left(), mZoomRect.bottom() + 1 );
|
|
110 |
QgsPoint ur = coordinateTransform->toMapCoordinates( mZoomRect.right() + 1, mZoomRect.top() );
|
|
111 |
|
|
112 |
QgsRectangle r( ll, ur );
|
|
113 |
|
|
114 |
if ( isZoomOut )
|
| 108 |
115 |
{
|
| 109 |
116 |
QgsPoint cer = r.center();
|
| 110 |
117 |
QgsRectangle extent = mCanvas->extent();
|
| 111 |
118 |
|
| 112 |
|
double sf;
|
| 113 |
|
if ( mZoomRect.width() > mZoomRect.height() )
|
| 114 |
|
{
|
| 115 |
|
sf = extent.width() / r.width();
|
| 116 |
|
}
|
| 117 |
|
else
|
| 118 |
|
{
|
| 119 |
|
sf = extent.height() / r.height();
|
| 120 |
|
}
|
| 121 |
|
r.expand( sf );
|
|
119 |
// calculate the ratios: width, height - of old to new rectangles
|
|
120 |
double wRatio = extent.width() / r.width();
|
|
121 |
double hRatio = extent.height() / r.height();
|
|
122 |
|
|
123 |
// take the smaller ratio (the direction the zoom rect is closer to the edges of the map)
|
|
124 |
double sf = wRatio < hRatio ? wRatio : hRatio;
|
|
125 |
|
|
126 |
//set the rectangle representing the new location to the original extent's size
|
|
127 |
double w2 = extent.width() / 2.0;
|
|
128 |
double h2 = extent.height() / 2.0;
|
|
129 |
r.set( QgsPoint( cer.x() - w2, cer.y() - h2 ),
|
|
130 |
QgsPoint( cer.x() + w2, cer.y() + h2 ) );
|
|
131 |
|
|
132 |
// then scale it
|
|
133 |
r.scale( sf );
|
| 122 |
134 |
|
| 123 |
135 |
QgsDebugMsg( QString( "Extent scaled by %1 to %2" ).arg( sf ).arg( r.toString().toLocal8Bit().constData() ) );
|
| 124 |
136 |
QgsDebugMsg( QString( "Center of currentExtent after scaling is %1" ).arg( r.center().toString().toLocal8Bit().constData() ) );
|
| ... | ... | |
| 131 |
143 |
else // not dragging
|
| 132 |
144 |
{
|
| 133 |
145 |
// change to zoom in/out by the default multiple
|
| 134 |
|
mCanvas->zoomWithCenter( e->x(), e->y(), !mZoomOut );
|
|
146 |
mCanvas->zoomWithCenter( e->x(), e->y(), !isZoomOut );
|
| 135 |
147 |
}
|
| 136 |
148 |
}
|
| 137 |
149 |
|