Initial commit

engines/asylum/resources/polygons.cpp

@@ -0,0 +1,107 @@
+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "asylum/resources/polygons.h"
+
+namespace Asylum {
+
+//////////////////////////////////////////////////////////////////////////
+// Contains
+//////////////////////////////////////////////////////////////////////////
+bool Polygon::contains(const Common::Point &point) {
+	// Copied from backends/vkeybd/polygon.cpp
+	bool  yflag0;
+	bool  yflag1;
+	bool inside_flag = false;
+
+	// if no points are defined, an intersect check will fail
+	// (count - 1 would trigger an assertion in vtx0)
+	if (points.size() == 0)
+		return false;
+
+	Common::Point *vtx0 = &points[count() - 1];
+	Common::Point *vtx1 = &points[0];
+
+	yflag0 = (vtx0->y > point.y);
+	for (uint32 pt = 0; pt < count(); pt++, vtx1++) {
+		if (point == *vtx1)
+			return true;
+
+		yflag1 = (vtx1->y > point.y);
+		if (yflag0 != yflag1) {
+			if (((vtx1->y - point.y) * (vtx0->x - vtx1->x) > (vtx1->x - point.x) * (vtx0->y - vtx1->y)) == yflag1) {
+				inside_flag = !inside_flag;
+			}
+		}
+		yflag0 = yflag1;
+		vtx0   = vtx1;
+	}
+
+	return inside_flag;
+}
+
+//////////////////////////////////////////////////////////////////////////
+// Polygons
+//////////////////////////////////////////////////////////////////////////
+Polygons::Polygons(Common::SeekableReadStream *stream) : _size(0), _numEntries(0) {
+	load(stream);
+}
+
+Polygons::~Polygons() {
+	_entries.clear();
+}
+
+Polygon Polygons::get(uint32 index) {
+	if (index >= _entries.size())
+		error("[Polygons::getEntry] Invalid polygon index (was: %d, max: %d)", index, _entries.size() - 1);
+
+	return _entries[index];
+}
+
+void Polygons::load(Common::SeekableReadStream *stream) {
+	_size       = stream->readSint32LE();
+	_numEntries = stream->readSint32LE();
+
+	for (int32 g = 0; g < _numEntries; g++) {
+		Polygon poly;
+
+		uint32 numPoints = stream->readUint32LE();
+
+		for (uint32 i = 0; i < numPoints; i++) {
+			Common::Point point;
+			point.x = (int16)(stream->readSint32LE() & 0xFFFF);
+			point.y = (int16)(stream->readSint32LE() & 0xFFFF);
+
+			poly.points.push_back(point);
+		}
+
+		stream->skip((MAX_POLYGONS - numPoints) * 8);
+
+		poly.boundingRect.left   = (int16)(stream->readSint32LE() & 0xFFFF);
+		poly.boundingRect.top    = (int16)(stream->readSint32LE() & 0xFFFF);
+		poly.boundingRect.right  = (int16)(stream->readSint32LE() & 0xFFFF);
+		poly.boundingRect.bottom = (int16)(stream->readSint32LE() & 0xFFFF);
+
+		_entries.push_back(poly);
+	}
+}
+
+} // end of namespace Asylum