MADS: Implement some more Camera code

3 files changed, 120 insertions, 0 deletions

diff --git a/engines/mads/game.cpp b/engines/mads/game.cpp
index 5ffe3ec9e6..607b7a44a6 100644
--- a/engines/mads/game.cpp
+++ b/engines/mads/game.cpp
@@ -705,4 +705,120 @@ void Game::camSetSpeed() {
 	}
 }
 
+void Game::camUpdate() {
+	bool any_pan = camPan(&_camX, &_scene._posAdjust.x, &_player._playerPos.x, 320, _scene._sceneInfo->_width);
+	any_pan |= camPan(&_camY, &_scene._posAdjust.y, &_player._playerPos.y, 156, _scene._sceneInfo->_height);
+
+	if (any_pan) {
+		_scene.setCamera(_scene._posAdjust);
+		_screenObjects._forceRescan = true;
+	}
+}
+
+bool Game::camPan(Camera *camera, int16 *picture_view, int16 *player_loc, int display_size, int picture_size) {
+	if (!camera)
+		return false;
+
+	bool panningFl = false;
+	if (camera->_panAllowedFl) {
+		camera->_currentFrameFl = false;
+
+		uint32 timer;
+		if ((abs((int32) (camera->_timer - _player._priorTimer)) < camera->_rate) && (_player._ticksAmount == camera->_rate))
+			timer = _player._priorTimer;
+		else
+			timer = camera->_timer;
+
+		if (camera->_activeFl && (_scene._frameStartTime < timer))
+			return (panningFl);
+
+		camera->_timer = _scene._frameStartTime + camera->_rate;
+
+		if (camera->_manualFl) {
+			if (camera->_activeFl) {
+				int diff = camera->_target - *picture_view;
+				int direction = 0;
+				if (diff < 0)
+					direction = -1;
+				else if (diff > 0)
+					direction = 1;
+
+				int magnitude = MIN(abs(diff), camera->_speed);
+
+				if (magnitude == 0)
+					camera->_activeFl = false;
+				else {
+					int panAmount;
+					if (direction < 0)
+						panAmount = -magnitude;
+					else
+						panAmount = magnitude;
+
+					*picture_view += panAmount;
+
+					panningFl = true;
+					camera->_currentFrameFl = true;
+				}
+			}
+		} else {
+			if (!camera->_activeFl) {
+				int lowEdge = *picture_view + camera->_startTolerance;
+				int highEdge = *picture_view - camera->_startTolerance + display_size - 1;
+
+				if ((*player_loc < lowEdge) && (picture_view > 0)) {
+					camera->_activeFl = true;
+					camera->_direction = -1;
+				}
+
+				if ((*player_loc > highEdge) && (*picture_view < (picture_size - display_size))) {
+					camera->_activeFl = true;
+					camera->_direction = 1;
+				}
+			}
+
+			int newTarget = *player_loc - (display_size >> 1);
+
+			if (camera->_direction < 0)
+				newTarget -= camera->_distOffCenter;
+			else 
+				newTarget += camera->_distOffCenter;
+
+			newTarget = MAX(0, newTarget);
+			newTarget = MIN(newTarget, (picture_size - display_size));
+
+			camera->_target = newTarget;
+
+			int diff = newTarget - *picture_view;
+			int magnitude = abs(diff);
+
+			int direction = 0;
+			if (diff < 0)
+				direction = -1;
+			else if (diff > 0)
+				direction = 1;
+
+			if (camera->_activeFl && (magnitude <= camera->_endTolerance))
+				camera->_activeFl = false;
+
+			if (camera->_activeFl) {
+				magnitude = MIN(magnitude, camera->_speed);
+
+				int panAmount;
+				if (direction < 0)
+					panAmount = -magnitude;
+				else
+					panAmount = magnitude;
+
+				if (panAmount) {
+					*picture_view += panAmount;
+					panningFl = true;
+					camera->_currentFrameFl = true;
+				}
+			}
+		}
+	}
+
+	return (panningFl);
+}
+
 } // End of namespace MADS
diff --git a/engines/mads/game.h b/engines/mads/game.h
index fa6444a834..0579d94b32 100644
--- a/engines/mads/game.h
+++ b/engines/mads/game.h
@@ -264,6 +264,8 @@ public:
 	void camPanTo(Camera *camera, int target);
 	void camInitDefault();
 	void camSetSpeed();
+	void camUpdate();
+	bool camPan(Camera *camera, int16 *picture_view, int16 *player_loc, int display_size, int picture_size);
 
 };
 
diff --git a/engines/mads/scene.cpp b/engines/mads/scene.cpp
index 335f772bbb..da62a6335e 100644
--- a/engines/mads/scene.cpp
+++ b/engines/mads/scene.cpp
@@ -390,6 +390,7 @@ void Scene::doFrame() {
 				!_vm->_game->_fx);
 	}
 
+	_vm->_game->camUpdate();
 	if (_action._selectedAction && player._stepEnabled && !player._needToWalk &&
 			!_vm->_game->_trigger && !player._trigger) {
 		_action.startAction();
@@ -789,6 +790,7 @@ void Scene::setDynamicAnim(int id, int anim_id, int segment) {
 
 void Scene::setCamera(Common::Point pos) {
 	_posAdjust = pos;
+	warning("setCamera: Incomplete function");
 }
 
 void Scene::drawToBackground(int spriteId, int frameId, Common::Point pos, int depth, int scale) {