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88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
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/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "graphics/transform_tools.h"
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#include <math.h>
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namespace Graphics {
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FloatPoint TransformTools::transformPoint(FloatPoint point, const float rotate, const Common::Point &zoom, const bool mirrorX, const bool mirrorY) {
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float rotateRad = rotate * M_PI / 180.0f;
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float x = point.x;
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float y = point.y;
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x = (x * zoom.x) / kDefaultZoomX;
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y = (y * zoom.y) / kDefaultZoomY;
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#if 0
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// TODO: Mirroring should be done before rotation, but the blitting
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// code does the inverse, so we match that for now.
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if (mirrorX)
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x *= -1;
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if (mirrorY)
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y *= -1;
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#endif
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FloatPoint newPoint;
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newPoint.x = x * cos(rotateRad) - y * sin(rotateRad);
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newPoint.y = x * sin(rotateRad) + y * cos(rotateRad);
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if (mirrorX) {
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newPoint.x *= -1;
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}
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if (mirrorY) {
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newPoint.y *= -1;
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}
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return newPoint;
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}
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Common::Rect TransformTools::newRect(const Common::Rect &oldRect, const TransformStruct &transform, Common::Point *newHotspot) {
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Common::Point nw(oldRect.left, oldRect.top);
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Common::Point ne(oldRect.right, oldRect.top);
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Common::Point sw(oldRect.left, oldRect.bottom);
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Common::Point se(oldRect.right, oldRect.bottom);
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FloatPoint nw1, ne1, sw1, se1;
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nw1 = transformPoint(nw - transform._hotspot, transform._angle, transform._zoom);
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ne1 = transformPoint(ne - transform._hotspot, transform._angle, transform._zoom);
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sw1 = transformPoint(sw - transform._hotspot, transform._angle, transform._zoom);
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se1 = transformPoint(se - transform._hotspot, transform._angle, transform._zoom);
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float top = MIN(nw1.y, MIN(ne1.y, MIN(sw1.y, se1.y)));
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float bottom = MAX(nw1.y, MAX(ne1.y, MAX(sw1.y, se1.y)));
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float left = MIN(nw1.x, MIN(ne1.x, MIN(sw1.x, se1.x)));
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float right = MAX(nw1.x, MAX(ne1.x, MAX(sw1.x, se1.x)));
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if (newHotspot) {
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newHotspot->y = (uint32)(-floor(top));
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newHotspot->x = (uint32)(-floor(left));
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}
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Common::Rect res;
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res.top = (int32)(floor(top)) + transform._hotspot.y;
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res.bottom = (int32)(ceil(bottom)) + transform._hotspot.y;
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res.left = (int32)(floor(left)) + transform._hotspot.x;
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res.right = (int32)(ceil(right)) + transform._hotspot.x;
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return res;
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}
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} // End of namespace Graphics
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