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engines/tinsel/scroll.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.
+ *
+ * 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 TINSEL_SCROLL_H // prevent multiple includes
+#define TINSEL_SCROLL_H
+
+namespace Tinsel {
+
+#define MAX_HNOSCROLL 10
+#define MAX_VNOSCROLL 10
+
+// These structures defined here so boundaries can be saved
+struct NOSCROLLB {
+	int ln;
+	int c1;
+	int c2;
+};
+
+struct SCROLLDATA {
+	NOSCROLLB NoVScroll[MAX_VNOSCROLL]; // Vertical no-scroll boundaries
+	NOSCROLLB NoHScroll[MAX_HNOSCROLL]; // Horizontal no-scroll boundaries
+	unsigned NumNoV, NumNoH;            // Counts of no-scroll boundaries
+	// DW2 fields
+	int xTrigger;
+	int xDistance;
+	int xSpeed;
+	int yTriggerTop;
+	int yTriggerBottom;
+	int yDistance;
+	int ySpeed;
+};
+
+class Scroll {
+public:
+	Scroll();
+
+	void DontScrollCursor();
+	void DoScrollCursor();
+
+	void SetNoScroll(int x1, int y1, int x2, int y2);
+	void DropScroll();
+
+	void ScrollFocus(int actor);
+	int GetScrollFocus();
+	void ScrollTo(int x, int y, int xIter, int yIter);
+
+	void KillScroll();
+
+	void GetNoScrollData(SCROLLDATA *ssd);
+	void RestoreNoScrollData(SCROLLDATA *ssd);
+
+	void SetScrollParameters(int xTrigger, int xDistance, int xSpeed, int yTriggerTop,
+	                         int yTriggerBottom, int yDistance, int ySpeed);
+
+	bool IsScrolling();
+
+	void ScrollImage();
+	void MonitorScroll();
+
+	void InitScroll(int width, int height);
+
+private:
+	void NeedScroll(int direction);
+	void RestoreScrollDefaults();
+
+	int _leftScroll, _downScroll; // Number of iterations outstanding
+
+	int _scrollActor;
+	MOVER *_pScrollMover;
+	int _oldx, _oldy;
+
+	/** Boundaries and numbers of boundaries */
+	SCROLLDATA _scrollData;
+
+	int _imageW, _imageH;
+
+	bool _scrollCursor; // If a TAG or EXIT polygon is clicked on,
+	    // the cursor is kept over that polygon
+	    // whilst scrolling
+
+	int _scrollPixelsX, _scrollPixelsY;
+};
+
+void ScrollProcess(CORO_PARAM, const void *);
+
+} // End of namespace Tinsel
+
+#endif /* TINSEL_SCROLL_H */