private void MainCanvas_MouseDown(object sender, MouseButtonEventArgs e)
{
Canvas canvas = sender as Canvas;
if (canvas == null)
{
return;
}
if (medianMode)
{
if (lastClickedLine != null)
{
Line median = lastClickedLine.GetMedian(e.GetPosition(canvas));
MyLine line = new MyLine(median);
lines.Add(median, line);
MainCanvas.Children.Add(median);
medianMode = false;
}
return;
}
if (heightMode)
{
if (lastClickedLine != null)
{
Line height = lastClickedLine.GetHeight(e.GetPosition(canvas));
MyLine line = new MyLine(height);
lines.Add(height, line);
MainCanvas.Children.Add(height);
heightMode = false;
}
return;
}
HitTestResult hitTestResult = VisualTreeHelper.HitTest(canvas, e.GetPosition(canvas));
if (hitTestResult.VisualHit is Line selectedLine)
{
if (morphingLine != null && selectedLine == morphingLine)
{
return;
}
ICanvasObject myLine = lines[selectedLine];
if (Keyboard.IsKeyDown(Key.LeftCtrl) == false)
{
foreach (var line in currentSelection)
{
line.Deselect();
}
currentSelection.Clear();
currentGroupSelection.Clear();
}
//Select new element
if (currentSelection.Contains(myLine) == false)
{
myLine.Select();
currentSelection.Add(myLine);
currentSelection.Last().Select();
lastClickedLine = selectedLine;
lbEquation.Text = $"Уравнение: {lastClickedLine.GetLineConstants()}";
}
}
else if (hitTestResult.VisualHit is Canvas)
{
foreach (var line in currentSelection)
{
line.Deselect();
}
currentSelection.Clear();
}
//Save mouse position
previousMousePosition = e.GetPosition(canvas);
isMousePressed = true;
}
