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lock viewport scrolling into map size

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This commit is contained in:
Paolo Chiodi
2010-09-02 19:14:44 +02:00
committed by Chris Forbes
parent 38fa809656
commit 73017d3f5c
2 changed files with 22 additions and 2 deletions
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22
OpenRA.Game/Graphics/Viewport.cs
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@@ -22,6 +22,8 @@ namespace OpenRA.Graphics
readonly float2 screenSize;
float2 scrollPosition;
readonly Renderer renderer;
readonly int2 mapStart;
readonly int2 mapEnd;
public float2 Location { get { return scrollPosition; } }
@@ -35,13 +37,31 @@ namespace OpenRA.Graphics
public void Scroll(float2 delta)
{
scrollPosition = scrollPosition + delta;
float2 topLeftBorder = (Game.CellSize* mapStart).ToFloat2();
float2 bottomRightBorder = (Game.CellSize* mapEnd).ToFloat2();
float2 newScrollPosition = scrollPosition + delta;
if(newScrollPosition.Y < topLeftBorder.Y)
newScrollPosition.Y = topLeftBorder.Y;
if(newScrollPosition.X < topLeftBorder.X)
newScrollPosition.X = topLeftBorder.X;
if(newScrollPosition.Y > bottomRightBorder.Y-screenSize.Y)
newScrollPosition.Y = bottomRightBorder.Y-screenSize.Y;
if(newScrollPosition.X > bottomRightBorder.X-screenSize.X)
newScrollPosition.X = bottomRightBorder.X-screenSize.X;
scrollPosition = newScrollPosition;
}
public Viewport(float2 screenSize, int2 mapStart, int2 mapEnd, Renderer renderer)
{
this.screenSize = screenSize;
this.renderer = renderer;
this.mapStart = mapStart;
this.mapEnd = mapEnd;
this.scrollPosition = Game.CellSize* mapStart;
}