public override void OnModifierKeyDown(ModifierKeyArgs e)
{
base.OnModifierKeyDown(e);
double factor = 0;
if ((e.Key == Key.Add || e.Key == Key.OemPlus) && Keyboard.Modifiers.HasFlag(ModifierKeys.Control))
{
// On CTRL+, Zoom In
factor = -ZoomFraction;
}
if ((e.Key == Key.Subtract || e.Key == Key.OemMinus) && Keyboard.Modifiers.HasFlag(ModifierKeys.Control))
{
// On CTRL-, Zoom Out
factor = ZoomFraction;
}
using (ParentSurface.SuspendUpdates())
{
// Zoom the XAxis by the required factor
XAxis.ZoomBy(factor, factor, TimeSpan.FromMilliseconds(500));
// Zoom the YAxis by the required factor
YAxis.ZoomBy(factor, factor, TimeSpan.FromMilliseconds(500));
// Note.. can be extended for multiple YAxis XAxis, just iterate over all axes on the parent surface
}
}
public override void OnModifierMouseWheel(ModifierMouseArgs e)
{
e.Handled = true;
var usey = Keyboard.IsKeyDown(Key.LeftCtrl) || Keyboard.IsKeyDown(Key.RightCtrl);
var usex = true;
var factor = 1 - e.Delta * 0.001;
using (ParentSurface.SuspendUpdates())
{
var p = TransformMousePoint(GetPointRelativeTo(e.MousePoint, ParentSurface.RenderSurface));
if (usex)
{
var vr = ParentSurface.XAxis.VisibleRange.AsDoubleRange();
var leftPart = p.X - vr.Min;
var rightPart = vr.Max - p.X;
leftPart *= factor;
rightPart *= factor;
ParentSurface.XAxis.VisibleRange = new DoubleRange(p.X - leftPart, p.X + rightPart);
}
if (usey)
{
var vr = ParentSurface.YAxis.VisibleRange.AsDoubleRange();
var bottomPart = p.Y - vr.Min;
var topPart = vr.Max - p.Y;
bottomPart *= factor;
topPart *= factor;
ParentSurface.YAxis.VisibleRange = new DoubleRange(p.Y - bottomPart, p.Y + topPart);
}
}
}
public override void OnModifierMouseMove(ModifierMouseArgs e)
{
base.OnModifierMouseMove(e);
if (_lastPoint == null)
{
return;
}
var currentPoint = e.MousePoint;
var xDelta = currentPoint.X - _lastPoint.Value.X;
var yDelta = _lastPoint.Value.Y - currentPoint.Y;
using (ParentSurface.SuspendUpdates())
{
// Scroll the XAxis by the number of pixels since the last update
XAxis.Scroll(XAxis.IsHorizontalAxis ? xDelta : -yDelta, ClipMode.None);
// Scroll the YAxis by the number of pixels since the last update
YAxis.Scroll(YAxis.IsHorizontalAxis ? -xDelta : yDelta, ClipMode.None);
// Note.. can be extended for multiple YAxis XAxis, just iterate over all axes on the parent surface
}
_lastPoint = currentPoint;
}
public void FlipAxes(AxisCollection axes)
{
using (ParentSurface.SuspendUpdates())
{
foreach (var axis in axes)
{
axis.FlipCoordinates = !axis.FlipCoordinates;
}
}
}
public override void OnModifierMouseWheel(ModifierMouseArgs e)
{
foreach (var axis in YAxes)
{
// Find the axis under the mouse now
var axisBounds = axis.GetBoundsRelativeTo(RootGrid);
if (axis.IsHorizontalAxis && axisBounds.Height < MinTouchArea)
{
axisBounds.Y -= (MinTouchArea - axisBounds.Height) / 2;
axisBounds.Height = MinTouchArea;
}
if (!axis.IsHorizontalAxis && axisBounds.Width < MinTouchArea)
{
axisBounds.X -= (MinTouchArea - axisBounds.Width) / 2;
axisBounds.Width = MinTouchArea;
}
// Look only for the first axis that has been hit
if (axisBounds.Contains(e.MousePoint))
{
e.Handled = true;
const double mouseWheelDeltaCoef = 120;
using (ParentSurface.SuspendUpdates())
{
double value = -e.Delta / mouseWheelDeltaCoef;
var mousePoint = GetPointRelativeTo(e.MousePoint, ModifierSurface);
// Do the zoom on the axis
const double GrowFactor = 0.1;
double fraction = GrowFactor * value;
GrowBy(mousePoint, axis, fraction);
}
}
}
}
public IUpdateSuspender SuspendUpdates()
{
return(ParentSurface.SuspendUpdates());
}