That-One-Nerd/Graphing
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Zooming now focuses on the mouse cursor.

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That_One_Nerd 2024-05-01 12:30:48 -04:00
parent eea0bba358
commit 861c7c5a03
1 changed files with 9 additions and 0 deletions
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9
Base/Forms/GraphForm.cs
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@ -414,11 +414,20 @@ public partial class GraphForm : Form
{ {
if (ViewportLocked) return; if (ViewportLocked) return;
Point clientMousePos = PointToClient(Cursor.Position);
Int2 mousePos = new(clientMousePos.X, clientMousePos.Y);
Float2 mouseOver = ScreenSpaceToGraphSpace(mousePos);
Float2 newZoom = ZoomLevel; Float2 newZoom = ZoomLevel;
newZoom.x *= 1 - e.Delta * 0.00075; // Zoom factor. newZoom.x *= 1 - e.Delta * 0.00075; // Zoom factor.
newZoom.y *= 1 - e.Delta * 0.00075; newZoom.y *= 1 - e.Delta * 0.00075;
ZoomLevel = newZoom; ZoomLevel = newZoom;
// Keep the mouse as the zoom hotspot.
Float2 newOver = ScreenSpaceToGraphSpace(mousePos);
Float2 delta = new(newOver.x - mouseOver.x, newOver.y - mouseOver.y);
ScreenCenter = new(ScreenCenter.x - delta.x, ScreenCenter.y + delta.y);
Invalidate(false); Invalidate(false);
} }