From 0efa1bc5606c9fd984df077d55cf93a7903f5f67 Mon Sep 17 00:00:00 2001
From: Marisa-Chan <llancelot7@gmail.com>
Date: Fri, 7 Nov 2014 10:25:11 +0600
Subject: [PATCH] ZVISION: Implement action:rotate_to

---
 engines/zvision/scripting/actions.cpp         | 15 ++++++
 engines/zvision/scripting/actions.h           | 10 ++++
 .../zvision/scripting/scr_file_handling.cpp   |  2 +-
 engines/zvision/zvision.cpp                   | 52 +++++++++++++++++++
 engines/zvision/zvision.h                     |  2 +
 5 files changed, 80 insertions(+), 1 deletion(-)

diff --git a/engines/zvision/scripting/actions.cpp b/engines/zvision/scripting/actions.cpp
index 9733c5cae82d..2754a3967608 100644
--- a/engines/zvision/scripting/actions.cpp
+++ b/engines/zvision/scripting/actions.cpp
@@ -612,6 +612,21 @@ bool ActionRandom::execute() {
 	return true;
 }
 
+//////////////////////////////////////////////////////////////////////////////
+// ActionRotateTo
+//////////////////////////////////////////////////////////////////////////////
+
+ActionRotateTo::ActionRotateTo(ZVision *engine, int32 slotkey, const Common::String &line) :
+	ResultAction(engine, slotkey) {
+	sscanf(line.c_str(), "%d, %d", &_toPos, &_time);
+}
+
+bool ActionRotateTo::execute() {
+	_engine->rotateTo(_toPos, _time);
+
+	return true;
+}
+
 
 //////////////////////////////////////////////////////////////////////////////
 // ActionSetPartialScreen
diff --git a/engines/zvision/scripting/actions.h b/engines/zvision/scripting/actions.h
index f51847ed05d1..6a200198b737 100644
--- a/engines/zvision/scripting/actions.h
+++ b/engines/zvision/scripting/actions.h
@@ -360,6 +360,16 @@ class ActionRandom : public ResultAction {
 	ValueSlot *_max;
 };
 
+class ActionRotateTo : public ResultAction {
+public:
+	ActionRotateTo(ZVision *engine, int32 slotkey, const Common::String &line);
+	bool execute();
+
+private:
+	int32 _toPos;
+	int32 _time;
+};
+
 class ActionSetPartialScreen : public ResultAction {
 public:
 	ActionSetPartialScreen(ZVision *engine, int32 slotkey, const Common::String &line);
diff --git a/engines/zvision/scripting/scr_file_handling.cpp b/engines/zvision/scripting/scr_file_handling.cpp
index df60b0b8d4a1..b16a2d94745c 100644
--- a/engines/zvision/scripting/scr_file_handling.cpp
+++ b/engines/zvision/scripting/scr_file_handling.cpp
@@ -270,7 +270,7 @@ void ScriptManager::parseResults(Common::SeekableReadStream &stream, Common::Lis
 				} else if (act.matchString("restore_game", true)) {
 					// TODO: Implement ActionRestoreGame
 				} else if (act.matchString("rotate_to", true)) {
-					// TODO: Implement ActionRotateTo
+					actionList.push_back(new ActionRotateTo(_engine, slot, args));
 				} else if (act.matchString("save_game", true)) {
 					// TODO: Implement ActionSaveGame
 				} else if (act.matchString("set_partial_screen", true)) {
diff --git a/engines/zvision/zvision.cpp b/engines/zvision/zvision.cpp
index 41d3eea6aa0f..79f7d74a8d6d 100644
--- a/engines/zvision/zvision.cpp
+++ b/engines/zvision/zvision.cpp
@@ -402,4 +402,56 @@ void ZVision::updateRotation() {
 	}
 }
 
+void ZVision::rotateTo(int16 _toPos, int16 _time) {
+	if (_renderManager->getRenderTable()->getRenderState() != RenderTable::PANORAMA)
+		return;
+
+	if (_time == 0)
+		_time = 1;
+
+	int32 maxX = _renderManager->getBkgSize().x;
+	int32 curX = _renderManager->getCurrentBackgroundOffset();
+	int32 dx = 0;
+
+	if (curX == _toPos)
+		return;
+
+	if (curX > _toPos) {
+		if (curX - _toPos > maxX / 2)
+			dx = (_toPos + (maxX - curX)) / _time;
+		else
+			dx = -(curX - _toPos) / _time;
+	} else {
+		if (_toPos - curX > maxX / 2)
+			dx = -((maxX - _toPos) + curX) / _time;
+		else
+			dx = (_toPos - curX) / _time;
+	}
+
+	_clock.stop();
+
+	for (int16 i = 0; i <= _time; i++) {
+		if (i == _time)
+			curX = _toPos;
+		else
+			curX += dx;
+
+		if (curX < 0)
+			curX = maxX - curX;
+		else if (curX >= maxX)
+			curX %= maxX;
+
+		_renderManager->setBackgroundPosition(curX);
+
+		_renderManager->prepareBkg();
+		_renderManager->renderBackbufferToScreen();
+
+		_system->updateScreen();
+
+		_system->delayMillis(500 / _time);
+	}
+
+	_clock.start();
+}
+
 } // End of namespace ZVision
diff --git a/engines/zvision/zvision.h b/engines/zvision/zvision.h
index 0bee63945806..e2bde7bd9eb4 100644
--- a/engines/zvision/zvision.h
+++ b/engines/zvision/zvision.h
@@ -170,6 +170,8 @@ class ZVision : public Engine {
 	 */
 	void playVideo(Video::VideoDecoder &videoDecoder, const Common::Rect &destRect = Common::Rect(0, 0, 0, 0), bool skippable = true, Subtitle *sub = NULL);
 
+	void rotateTo(int16 to, int16 time);
+
 	Common::String generateSaveFileName(uint slot);
 	Common::String generateAutoSaveFileName();