private void ZoomToPoint(Point zoomPoint, double newZoomLevel)
{
var doublePoint = new DoublePoint()
{
X = zoomPoint.X, Y = zoomPoint.Y
};
// calculate source point BEFORE the zoom is applied since this changes the ViewportWidth value
var logicalSourcePoint = this.map.ConvertPixelToLogicalCoordinate(doublePoint);
newZoomLevel = Math.Max(newZoomLevel, 1);
var context = new ViewChangedContext()
{
PreviousZoomLevel = this.map.ZoomLevel,
PreviousCenter = this.map.Center,
NewZoomLevel = newZoomLevel
};
this.map.ZoomLevel = newZoomLevel;
var logicalTargetPoint = this.map.ConvertPixelToLogicalCoordinate(doublePoint);
var shift = new DoublePoint()
{
X = logicalSourcePoint.X - logicalTargetPoint.X, Y = logicalSourcePoint.Y - logicalTargetPoint.Y
};
var logicalCenter = this.map.SpatialReference.ConvertGeographicToLogicalCoordinate(this.map.Center);
logicalCenter.X += shift.X;
logicalCenter.Y += shift.Y;
context.NewCenter = this.map.SpatialReference.ConvertLogicalToGeographicCoordinate(logicalCenter);
this.ExecuteViewChangedCommand(context);
}
/// <summary>
/// Method is internal for the sake of unit-testing.
/// </summary>
/// <param name="translation">The translation.</param>
internal void OnPan(Point translation)
{
if (!this.IsPanEnabled)
{
return;
}
// NOTE: We can set directly the scroll offset but we need to pass through the coercion mechanism for the Center property instead.
var centerAfterPan = this.map.SpatialReference.ConvertGeographicToLogicalCoordinate(this.map.Center);
double pixelFactorX = this.map.ViewportWidth / this.map.CurrentSize.Width;
double pixelFactorY = this.map.ViewportWidth * this.map.AspectRatio / this.map.CurrentSize.Height;
centerAfterPan.X -= translation.X * pixelFactorX;
centerAfterPan.Y -= translation.Y * pixelFactorY;
double zoom = this.map.ZoomLevel;
var context = new ViewChangedContext()
{
PreviousZoomLevel = zoom,
PreviousCenter = this.map.Center,
NewCenter = map.SpatialReference.ConvertLogicalToGeographicCoordinate(centerAfterPan),
NewZoomLevel = zoom
};
this.ExecuteViewChangedCommand(context);
}
internal override void OnViewChanged(ViewChangedContext context)
{
base.OnViewChanged(context);
if (this.shapeLabelLayoutStrategyCache != null && context.NewZoomLevel != context.PreviousZoomLevel)
{
// we need to re-evaluate the labels upon each zoom since some labels may depend on the zoom level
this.ReevaluateShapeLabelStrategy();
}
}
private void ExecuteViewChangedCommand(ViewChangedContext context)
{
if (context.PreviousCenter == context.NewCenter && context.PreviousZoomLevel == context.NewZoomLevel)
{
// no actual change, do not raise the ViewChanged command
return;
}
if (!this.map.CommandService.ExecuteCommand(CommandId.ViewChanged, context))
{
// command isn't executed, rollback the previous zoom level (Center value does not need to be rolled back as it hasn't been changed yet).
this.map.ZoomLevel = context.PreviousZoomLevel;
}
}
private void NotifyViewChanged(ViewChangedContext context)
{
if (!this.IsTemplateApplied)
{
return;
}
foreach (var layer in this.layers)
{
layer.OnViewChanged(context);
}
foreach (MapBehavior behavior in this.behaviors)
{
behavior.OnMapViewChanged(context);
}
}
/// <summary>
/// Sets the provided <see cref="LocationRect"/> value as the current view of the map.
/// </summary>
/// <param name="boundingRect"></param>
public void SetView(LocationRect boundingRect)
{
boundingRect = this.CoerceLocationRect(boundingRect);
if (boundingRect.IsEmpty)
{
return;
}
if (!this.arrangePassed)
{
this.deferredBoundingRect = boundingRect;
return;
}
var topLeft = this.SpatialReference.ConvertGeographicToLogicalCoordinate(boundingRect.Northwest);
var bottomRight = this.SpatialReference.ConvertGeographicToLogicalCoordinate(boundingRect.Southeast);
var logicalCenter = new DoublePoint()
{
X = (topLeft.X + bottomRight.X) / 2d, Y = (topLeft.Y + bottomRight.Y) / 2d
};
Location center = this.SpatialReference.ConvertLogicalToGeographicCoordinate(logicalCenter);
double viewportWidth = bottomRight.X - topLeft.X;
double viewportHeight = bottomRight.Y - topLeft.Y;
double zoomWidth = Math.Log(this.currentSize.Width / TileSize.Width / viewportWidth, 2d);
double zoomHeight = Math.Log(this.currentSize.Height / TileSize.Height / viewportHeight, 2d);
double zoomLevel = Math.Min(zoomWidth, zoomHeight);
var context = new ViewChangedContext()
{
NewCenter = center,
NewZoomLevel = zoomLevel,
PreviousCenter = this.Center,
PreviousZoomLevel = this.ZoomLevel
};
this.OnViewChanged(context);
}
private void ZoomToCenter(double newZoomLevel)
{
var logicalSourcePoint = this.map.SpatialReference.ConvertGeographicToLogicalCoordinate(this.map.Center);
newZoomLevel = Math.Max(newZoomLevel, 1);
var context = new ViewChangedContext()
{
PreviousZoomLevel = this.map.ZoomLevel,
PreviousCenter = this.map.Center,
NewZoomLevel = newZoomLevel
};
this.map.ZoomLevel = newZoomLevel;
var logicalTargetPoint = this.map.SpatialReference.ConvertGeographicToLogicalCoordinate(this.map.Center);
Point shift = new Point(logicalSourcePoint.X - logicalTargetPoint.X, logicalSourcePoint.Y - logicalTargetPoint.Y);
logicalTargetPoint.X += shift.X;
logicalTargetPoint.Y += shift.Y;
context.NewCenter = this.map.SpatialReference.ConvertLogicalToGeographicCoordinate(logicalTargetPoint);
this.ExecuteViewChangedCommand(context);
}
/// <summary>
/// A callback from the owning <see cref="RadMap" /> instance that notifies for a view change event.
/// </summary>
/// <param name="context">The context.</param>
protected internal override void OnMapViewChanged(ViewChangedContext context)
{
base.OnMapViewChanged(context);
this.HideToolTip();
}
internal void OnViewChanged(ViewChangedContext context)
{
this.SetView(context.NewZoomLevel, context.NewCenter);
this.NotifyViewChanged(context);
}
/// <summary>
/// A callback from the owning <see cref="RadMap" /> instance that notifies for a view change event.
/// </summary>
/// <param name="context">The context.</param>
protected internal virtual void OnMapViewChanged(ViewChangedContext context)
{
}
internal override void OnViewChanged(ViewChangedContext context)
{
base.OnViewChanged(context);
this.UpdateUI();
}
internal virtual void OnViewChanged(ViewChangedContext context)
{
}