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engines/nancy/misc/mousefollow.cpp

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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/>.
+ *
+ */
+
+#include "engines/nancy/misc/mousefollow.h"
+#include "engines/nancy/enginedata.h"
+#include "engines/nancy/nancy.h"
+#include "engines/nancy/graphics.h"
+
+namespace Nancy {
+namespace Misc {
+
+MouseFollowObject::MouseFollowObject()
+		: RenderObject(8) {
+	_viewportData = GetEngineData(VIEW);
+}
+
+void MouseFollowObject::handleInput(NancyInput &input) {
+	Common::Point mousePos = input.mousePos;
+	Common::Rect viewport = _viewportData->screenPosition;
+
+	if (!_isPickedUp || !viewport.contains(mousePos)) {
+		return;
+	}
+
+	mousePos.x -= viewport.left;
+	mousePos.y -= viewport.top;
+
+	// Move the tile under the cursor
+	Common::Rect newScreenPos = _drawSurface.getBounds();
+	newScreenPos.moveTo(mousePos);
+	newScreenPos.translate(-newScreenPos.width() / 2, -newScreenPos.height() / 2);
+
+	// Clip movement so the ring stays entirely inside the viewport
+	if (newScreenPos.left < 0) {
+		newScreenPos.translate(-newScreenPos.left, 0);
+	} else if (newScreenPos.right > viewport.width()) {
+		newScreenPos.translate(viewport.width() - newScreenPos.right, 0);
+	}
+
+	if (newScreenPos.top < 0) {
+		newScreenPos.translate(0, -newScreenPos.top);
+	} else if (newScreenPos.bottom > viewport.height()) {
+		newScreenPos.translate(0, viewport.height() - newScreenPos.bottom);
+	}
+
+	if (newScreenPos != _screenPosition) {
+		moveTo(newScreenPos);
+	}
+}
+
+} // End of namespace Misc
+} // End of namespace Nancy