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Fully working zoom relative to cursor

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This commit is contained in:
Simon Holmberg
2012-09-28 14:12:26 +02:00
parent a1527e745b
commit 8c6878ef25
1 changed files with 20 additions and 18 deletions
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DepthsBelow/DepthsBelow/Camera.cs
+20 -18
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@@ -47,41 +47,43 @@ namespace DepthsBelow
MouseState ms = Mouse.GetState();
if (ms.X < 20)
Position.X -= Speed * elapsed;
if (ms.X > core.GraphicsDevice.Viewport.Width - 20)
Position.X += Speed * elapsed;
if (ms.X > core.GraphicsDevice.Viewport.Width - 20)
Position.X -= Speed * elapsed;
if (ms.Y < 20)
Position.Y -= Speed * elapsed;
if (ms.Y > core.GraphicsDevice.Viewport.Height - 20)
Position.Y += Speed * elapsed;
if (ms.Y > core.GraphicsDevice.Viewport.Height - 20)
Position.Y -= Speed * elapsed;
int scrollChange = ms.ScrollWheelValue - lastMouseState.ScrollWheelValue;
float preZoom = Zoom;
if (scrollChange > 0)
Zoom *= 1.15f;
else if (scrollChange < 0)
Zoom /= 1.15f;
// Store the current screen and world position of the mouse for zoom compensation
var mousePosBefore = new Vector2(ms.X, ms.Y);
var mousePosBeforeWorld = this.ScreenToWorld(mousePosBefore);
// Apply the matrix transformation
Transform = Matrix.Identity
* Matrix.CreateRotationZ(Rotation)
* Matrix.CreateScale(Zoom)
* Matrix.CreateTranslation(new Vector3(-Position.X, -Position.Y, 0));
/*var mouseOffset = core.camera.ScreenToWorld(new Vector2(ms.X, ms.Y));
* Matrix.CreateRotationZ(Rotation)
* Matrix.CreateScale(Zoom)
* Matrix.CreateTranslation(new Vector3(Position.X, Position.Y, 0));
// If we've zoomed
if (scrollChange != 0)
{
Transform *= Matrix.CreateTranslation(new Vector3(-mouseOffset.X, -mouseOffset.Y, 0))
* Matrix.CreateScale(Zoom)
* Matrix.CreateTranslation(new Vector3(mouseOffset.X, mouseOffset.Y, 0));
// Translate the stored world position back to new screen coordinates
var mousePosAfter = this.WorldToScreen(mousePosBeforeWorld);
var change = mousePosBefore - mousePosAfter;
// Update position and matrix transformation
Position += change;
Transform *= Matrix.CreateTranslation(new Vector3(change.X, change.Y, 0));
}
else
{
Transform *= Matrix.CreateScale(Zoom) * Matrix.CreateTranslation(new Vector3(-Position.X, -Position.Y, 0)); ;
}*/
lastMouseState = ms;
}