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Unity　ライフバー

http://unity3d.com/support/documentation/Components/gui-Layout.html
前回紹介したやつだが実際実行すると表示がおかしい
修正したい

/* Using multiple Groups to clip the displayed Contents */

var bgImage : Texture2D; // background image that is 256 x 32
var fgImage : Texture2D; // foreground image that is 256 x 32
var playerEnergy = 1.0; // a float between 0.0 and 1.0

function OnGUI () {
	// Create one Group to contain both images
	// Adjust the first 2 coordinates to place it somewhere else on-screen
	GUI.BeginGroup (Rect (0,0,256,32));

	// Draw the background image
	GUI.Box (Rect (0,0,256,32), bgImage);

	// Create a second Group which will be clipped
	// We want to clip the image and not scale it, which is why we need the second Group
	GUI.BeginGroup (Rect (0,0,playerEnergy * 256, 32));

	// Draw the foreground image
	GUI.Box (Rect (0,0,256,32), fgImage);

	// End both Groups
	GUI.EndGroup ();
	GUI.EndGroup ();
}