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mapwidget.qml: implement centerOnRectangle()

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First, this function calculates the zoom out effect until both the
current Map center and the target rectangle are visible - see the
"calculate zoom out" part.

Then it calculates a zoom level, so that the target rectangle
fits the viewport, but also so that the zoom is not too much (clamped).
see the "calculate zoom in" part.

NOTE: "centerStored" (the variable used to store the current map center)
is created using QtPositioning.coordinate(), because the code needs a new
object and not a reference of the map.center QGeoCoordinate object.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>
This commit is contained in:
Lubomir I. Ivanov 2017-08-07 02:18:09 +03:00 • committed by Dirk Hohndel
parent 0fc9a3bf4a
commit 5db2460168
1 changed files with 43 additions and 2 deletions
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45
mobile-widgets/qml/MapWidget.qml
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@ -181,8 +181,49 @@ Item {
mapAnimationZoomOut.stop()
}
function centerOnRectangle(topLeft, bottomRight, center) {
// TODO
function centerOnRectangle(topLeft, bottomRight, centerRect) {
stopZoomAnimations()
newCenter = centerRect
if (newCenter.latitude === 0.0 && newCenter.longitude === 0.0) {
newZoom = 2.6
newZoomOut = newZoom
} else {
var centerStored = QtPositioning.coordinate(center.latitude, center.longitude)
var zoomStored = zoomLevel
var ptCenter
var ptTopLeft
var ptBottomRight
// calculate zoom out
newZoomOut = zoomLevel
while (zoomLevel > minimumZoomLevel) {
ptCenter = fromCoordinate(centerStored)
ptTopLeft = fromCoordinate(topLeft)
ptBottomRight = fromCoordinate(bottomRight)
if (pointIsVisible(ptCenter) && pointIsVisible(ptTopLeft) && pointIsVisible(ptBottomRight)) {
newZoomOut = zoomLevel
break
}
zoomLevel--
}
// calculate zoom in
center = newCenter
zoomLevel = maximumZoomLevel
while (zoomLevel > minimumZoomLevel) {
ptTopLeft = fromCoordinate(topLeft)
ptBottomRight = fromCoordinate(bottomRight)
if (pointIsVisible(ptTopLeft) && pointIsVisible(ptBottomRight)) {
newZoom = zoomLevel
break
}
zoomLevel--
}
if (newZoom > defaultZoomIn)
newZoom = defaultZoomIn
zoomLevel = zoomStored
center = centerStored
}
mapAnimationZoomIn.restart()
mapAnimationZoomOut.stop()
}
function deselectMapLocation() {