WINTERMUTE: Introduce TransformTools

1 files changed, 75 insertions, 0 deletions

diff --git a/engines/wintermute/graphics/transform_tools.cpp b/engines/wintermute/graphics/transform_tools.cpp
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+++ b/engines/wintermute/graphics/transform_tools.cpp
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+
+#include "engines/wintermute/graphics/transform_tools.h"
+#include <math.h>
+
+namespace Wintermute {
+	
+	FloatPoint TransformTools::transformPoint(FloatPoint point, float rotate, Point32 zoom, bool mirrorX, bool mirrorY) {
+		/*
+		* Returns the coordinates for a point after rotation
+		*/
+		float rotateRad = rotate * M_PI / 180;
+		FloatPoint newPoint;
+		newPoint.x = (point.x * cos(rotateRad) - point.y * sin(rotateRad))*zoom.x/100;
+		newPoint.y = (point.x * sin(rotateRad) + point.y * cos(rotateRad))*zoom.y/100;
+		if (mirrorX) newPoint.x *= -1;
+		if (mirrorY) newPoint.y *= -1;
+		/*
+		* I apply the textbook formula, but first I reverse the Y-axis, otherwise
+		* I'd be performing a rotation in the wrong direction
+		*/
+		return newPoint;
+	}
+
+	Rect32 TransformTools::newRect (Rect32 oldRect, TransformStruct transform, Point32 *newHotspot) {
+		Point32 nw(oldRect.left, oldRect.top);
+		Point32 ne(oldRect.right, oldRect.top);
+		Point32 sw(oldRect.left, oldRect.bottom);
+		Point32 se(oldRect.right, oldRect.bottom);
+		
+		FloatPoint nw1, ne1, sw1, se1;
+
+		nw1 = transformPoint(nw - transform._hotspot, transform._angle, transform._zoom);
+		ne1 = transformPoint(ne - transform._hotspot, transform._angle, transform._zoom);
+		sw1 = transformPoint(sw - transform._hotspot, transform._angle, transform._zoom);
+		se1 = transformPoint(se - transform._hotspot, transform._angle, transform._zoom);
+		
+		float top = MIN(nw1.y, MIN(ne1.y, MIN(sw1.y, se1.y)));
+		float bottom = MAX(nw1.y, MAX(ne1.y, MAX(sw1.y, se1.y)));
+		float left = MIN(nw1.x, MIN(ne1.x, MIN(sw1.x, se1.x)));
+		float right = MAX(nw1.x, MAX(ne1.x, MAX(sw1.x, se1.x)));
+
+		Rect32 res;
+		newHotspot->y = -floor(top);
+		newHotspot->x = -floor(left);
+
+		res.top = floor(top) + transform._hotspot.y;
+		res.bottom = ceil(bottom) + transform._hotspot.y; 
+		res.left = floor(left) + transform._hotspot.x;
+		res.right = ceil(right) + transform._hotspot.x;
+
+		return res;
+	}
+}