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engines/icb/common/px_2drealline.h

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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.
+ *
+ * Additional copyright for this file:
+ * Copyright (C) 1999-2000 Revolution Software Ltd.
+ * This code is based on source code created by Revolution Software,
+ * used with permission.
+ *
+ * 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/>.
+ *
+ */
+
+#ifndef ICB_PX2DLINE_H_INCLUDED
+#define ICB_PX2DLINE_H_INCLUDED
+
+#include "engines/icb/common/px_array.h"
+#include "engines/icb/common/px_2drealpoint.h"
+
+namespace ICB {
+
+// Note, this header file needs somethings :
+// e.g. PXreal, REAL_ZERO
+#ifndef REAL_ZERO
+#error "REAL_ZERO not defined in px2drealline.h"
+#endif // #ifndef REAL_ZERO
+
+// Here I define an array type for the class.  This neatens syntax and also allows pxArrays of pxArrays to be declared.
+class px2DRealLine;
+typedef rcActArray<px2DRealLine> px2DRealLineArray;
+
+// Holds a line on a plane as a pair of integer endpoints, and provides functions for working with them.
+class px2DRealLine {
+public:
+	// Definitions for this class.
+	enum IntersectionLogicVal { DONT_INTERSECT, DO_INTERSECT, COLLINEAR };
+
+	// Default constructor and destructor.
+	inline px2DRealLine() {
+		m_fX1 = REAL_ZERO;
+		m_fY1 = REAL_ZERO;
+		m_fX2 = REAL_ZERO;
+		m_fY2 = REAL_ZERO;
+	}
+	inline ~px2DRealLine() { ; }
+
+	// Gets and sets.
+	PXreal GetX1() const { return m_fX1; }
+	PXreal GetY1() const { return m_fY1; }
+	PXreal GetX2() const { return m_fX2; }
+	PXreal GetY2() const { return m_fY2; }
+
+	void SetX1(PXreal fX1) { m_fX1 = fX1; }
+	void SetY1(PXreal fY1) { m_fY1 = fY1; }
+	void SetX2(PXreal fX2) { m_fX2 = fX2; }
+	void SetY2(PXreal fY2) { m_fY2 = fY2; }
+
+	// This determines whether this-> line intersects another.
+	IntersectionLogicVal Intersects(const px2DRealLine &oLineB, px2DRealPoint &oIntersection) const;
+
+private:
+	PXreal m_fX1, m_fY1, m_fX2, m_fY2; // The line's endpoints.
+
+	// Functions used only by this class.
+	inline bool8 SameSigns(PXreal dA, PXreal dB) const;
+};
+
+inline bool8 px2DRealLine::SameSigns(PXreal fA, PXreal fB) const {
+	if (fA < REAL_ZERO) {
+		if (fB < REAL_ZERO)
+			return TRUE8;
+		else
+			return FALSE8;
+	} else {
+		if (fB < REAL_ZERO)
+			return FALSE8;
+		else
+			return TRUE8;
+	}
+}
+
+} // End of namespace ICB
+
+#endif // #ifndef PX2DLINE_H_INCLUDED