/// <summary>
/// Called on ManipulationDelta event detected on Y axis rectangle. Used to change axis scale easily
/// </summary>
private void ChartScroll_ManipulationYDelta(object sender, ManipulationDeltaRoutedEventArgs e)
{
// Make sure that the scale has changed by a sufficient amount to change the chart scale
if (Math.Abs(e.Delta.Scale - 1.0) >= 0.01)
{
// Make sure that the scale is within the bounds
if (ChartYScale <= MaxChartYScale && ChartYScale >= MinChartYScale)
{
ChartYScale *= 1.0 + 0.5 * (e.Delta.Scale - 1.0);
// Make sure the scale doesn't jump outside the bounds
if (ChartYScale < MinChartYScale)
{
ChartYScale = MinChartYScale;
}
if (ChartYScale > MaxChartYScale)
{
ChartYScale = MaxChartYScale;
}
// Change the height if the chart to match the new scale
ExpenseChart.Height = PivotItem2.ActualHeight * ChartYScale;
}
// If the scale is outside the bounds, scale back
else if (ChartYScale < MinChartYScale)
{
ChartYScale = MinChartYScale;
ExpenseChart.Height = PivotItem2.ActualHeight * ChartYScale;
}
else if (ChartYScale > MaxChartYScale)
{
ChartYScale = MaxChartYScale;
ExpenseChart.Height = PivotItem2.ActualHeight * ChartYScale;
}
}
// Adjust the position to the allow for dragging in the axis
double NewPosition = ChartScroll.VerticalOffset * ChartYScale + e.Delta.Translation.Y;
ChartScroll.ChangeView(ChartScroll.HorizontalOffset, NewPosition, ChartScroll.ZoomFactor, true);
}
private void AdjustGridSize()
{
double actualWidth = _maxObjectX - _minObjectX;
double actualHeight = _maxObjectY - _minObjectY;
double rightExtraWidth = 0.00;
if (_maxObjectX > ChartCanvas.Width)
{
rightExtraWidth = _maxObjectX - ChartCanvas.Width + ElementMargin;
}
double leftExtraWidth = 0.00;
if (_minObjectX < 0.00)
{
leftExtraWidth = Math.Abs(_minObjectX) + ElementMargin;
}
double lowerExtraHeight = 0.00;
if (_maxObjectY > ChartCanvas.Height)
{
lowerExtraHeight = _maxObjectY - ChartCanvas.Height + ElementMargin;
}
double upperExtraHeight = 0.00;
if (_minObjectY < 0.00)
{
upperExtraHeight = Math.Abs(_minObjectY) + ElementMargin;
}
double horisontalPadding = Math.Max(leftExtraWidth, rightExtraWidth);
double verticalPadding = Math.Max(lowerExtraHeight, upperExtraHeight);
ChartGrid.Width = horisontalPadding * 2 + ChartCanvas.Width;
ChartGrid.Height = verticalPadding * 2 + ChartCanvas.Height;
ChartScroll.ScrollToHorizontalOffset(horisontalPadding);
ChartScroll.ScrollToVerticalOffset(verticalPadding);
}
