PEGASUS: Add the auto dragger code

2 files changed, 148 insertions, 0 deletions

diff --git a/engines/pegasus/items/autodragger.cpp b/engines/pegasus/items/autodragger.cpp
new file mode 100755
index 0000000000..baad699a7e
--- /dev/null
+++ b/engines/pegasus/items/autodragger.cpp
@@ -0,0 +1,91 @@
+/* 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) 1995-1997 Presto Studios, Inc.
+ *
+ * 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 "pegasus/elements.h"
+#include "pegasus/items/autodragger.h"
+
+namespace Pegasus {
+
+AutoDragger::AutoDragger() {
+	_draggingElement = NULL;
+	_lastTime = 0;
+	initCallBack(this, kCallBackAtExtremes);
+}
+
+void AutoDragger::autoDrag(DisplayElement *dragElement, const Common::Point &startPoint, const Common::Point &stopPoint,
+		TimeValue dragTime, TimeScale dragScale) {
+	_draggingElement = dragElement;
+
+	if (_draggingElement) {
+		_startLocation = startPoint;
+		_stopLocation = stopPoint;
+		_lastTime = 0;
+		_done = false;
+		_draggingElement->moveElementTo(_startLocation.x, _startLocation.y);
+		setScale(dragScale);
+		setSegment(0, dragTime);
+		setTime(0);
+		scheduleCallBack(kTriggerAtStop, 0, 0);
+		startIdling();
+		start();
+	} else {
+		stopDragging();
+	}
+}
+
+void AutoDragger::stopDragging() {
+	cancelCallBack();
+	stopIdling();
+	_draggingElement = 0;
+	_startLocation = Common::Point();
+	_stopLocation = Common::Point();
+	_lastTime = 0;
+	_done = true;
+}
+
+bool AutoDragger::isDragging() {
+	return isIdling();
+}
+
+void AutoDragger::useIdleTime() {	
+	TimeValue thisTime = getTime();
+
+	if (thisTime != _lastTime) {
+		uint32 offsetX = (_stopLocation.x - _startLocation.x) * thisTime / getDuration();
+		uint32 offsetY = (_stopLocation.y - _startLocation.y) * thisTime / getDuration();
+		_draggingElement->moveElementTo(_startLocation.x + offsetX, _startLocation.x + offsetY);
+		_lastTime = thisTime;
+	}
+
+	if (_done)
+		stopDragging();
+}
+
+void AutoDragger::callBack() {
+	if (isIdling())
+		_done = true;
+}
+
+} // End of namespace Pegasus
diff --git a/engines/pegasus/items/autodragger.h b/engines/pegasus/items/autodragger.h
new file mode 100755
index 0000000000..6783fdf9a3
--- /dev/null
+++ b/engines/pegasus/items/autodragger.h
@@ -0,0 +1,57 @@
+/* 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) 1995-1997 Presto Studios, Inc.
+ *
+ * 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.
+ *
+ */
+
+#ifndef PEGASUS_ITEMS_AUTODRAGGER_H
+#define PEGASUS_ITEMS_AUTODRAGGER_H
+
+#include "pegasus/timers.h"
+
+namespace Pegasus {
+
+class DisplayElement;
+
+class AutoDragger : private Idler, private TimeBase, private TimeBaseCallBack {
+public:
+	AutoDragger();
+	virtual ~AutoDragger() {}
+
+	void autoDrag(DisplayElement *, const Common::Point &, const Common::Point &, TimeValue, TimeScale);
+	bool isDragging();
+	void stopDragging();
+
+protected:
+	void useIdleTime();
+	void callBack();
+
+	DisplayElement *_draggingElement;
+	Common::Point _startLocation, _stopLocation;
+	TimeValue _lastTime;
+	bool _done;
+};
+
+} // End of namespace Pegasus
+
+#endif
+