autoexpand save when particles are translated out of boundaries

src/client/GameSave.cpp

@@ -260,12 +260,82 @@ char * GameSave::Serialise(unsigned int & dataSize)
 	return serialiseOPS(dataSize);
 }
 
+void GameSave::Translate(vector2d translate)
+{
+	if(Collapsed())
+		Expand();
+	int nx, ny;
+	vector2d pos;
+	float minx = 0, miny = 0, maxx = 0, maxy = 0;
+	for (size_t i = 0; i < signs.size(); i++)
+	{
+		pos = v2d_new(signs[i].x, signs[i].y);
+		pos = v2d_add(pos,translate);
+		nx = floor(pos.x+0.5f);
+		ny = floor(pos.y+0.5f);
+		if (nx < minx)
+			minx = nx;
+		if (ny < miny)
+			miny = ny;
+		if (nx > maxx)
+			maxx = nx;
+		if (ny > maxy)
+			maxy = ny;
+	}
+	for (int i = 0; i < particlesCount; i++)
+	{
+		if (!particles[i].type) continue;
+		pos = v2d_new(particles[i].x, particles[i].y);
+		pos = v2d_add(pos,translate);
+		nx = floor(pos.x+0.5f);
+		ny = floor(pos.y+0.5f);
+		if (nx < minx)
+			minx = nx;
+		if (ny < miny)
+			miny = ny;
+		if (nx > maxx)
+			maxx = nx;
+		if (ny > maxy)
+			maxy = ny;
+	}
+	vector2d backCorrection = v2d_new(
+		(minx < 0) ? (-floor(minx / 4)) : 0,
+		(miny < 0) ? (-floor(miny / 4)) : 0
+	);
+	int blockBoundsX = int(maxx / CELL) + 1, blockBoundsY = int(maxy / CELL) + 1;
+	vector2d frontCorrection = v2d_new(
+		(blockBoundsX > blockWidth) ? (blockBoundsX - blockWidth) : 0,
+		(blockBoundsY > blockHeight) ? (blockBoundsY - blockHeight) : 0
+	);
+	if (frontCorrection.x < backCorrection.x)
+		frontCorrection.x = backCorrection.x;
+	else
+		backCorrection.x = frontCorrection.x;
+	if (frontCorrection.y < backCorrection.y)
+		frontCorrection.y = backCorrection.y;
+	else
+		backCorrection.y = frontCorrection.y;
+	int newWidth = (blockWidth + backCorrection.x + frontCorrection.x) * CELL;
+	int newHeight = (blockHeight + backCorrection.y + frontCorrection.y) * CELL;
+	if (newWidth > XRES)
+		frontCorrection.x = backCorrection.x = 0;
+	if (newHeight > YRES)
+		frontCorrection.y = backCorrection.y = 0;
+
+	translate = v2d_add(translate, v2d_multiply_float(backCorrection, CELL));
+	Transform(m2d_identity, translate,
+		(blockWidth + backCorrection.x + frontCorrection.x) * CELL,
+		(blockHeight + backCorrection.y + frontCorrection.y) * CELL
+	);
+}
+
 void GameSave::Transform(matrix2d transform, vector2d translate)
 {
 	if(Collapsed())
 		Expand();
-	int x, y, nx, ny, width = blockWidth*CELL, height = blockHeight*CELL, newWidth, newHeight, newBlockWidth, newBlockHeight;
-	vector2d pos, tmp, ctl, cbr, vel;
+
+	int width = blockWidth*CELL, height = blockHeight*CELL, newWidth, newHeight;
+	vector2d tmp, ctl, cbr;
 	vector2d cornerso[4];
 	// undo any translation caused by rotation
 	cornerso[0] = v2d_new(0,0);
@@ -286,10 +356,19 @@ void GameSave::Transform(matrix2d transform, vector2d translate)
 	translate = v2d_sub(translate,tmp);
 	newWidth = floor(cbr.x+0.5f)-floor(ctl.x+0.5f)+1;
 	newHeight = floor(cbr.y+0.5f)-floor(ctl.y+0.5f)+1;
+	Transform(transform, translate, newWidth, newHeight);
+}
+
+void GameSave::Transform(matrix2d transform, vector2d translate, int newWidth, int newHeight)
+{
+	if(Collapsed())
+		Expand();
+
 	if (newWidth>XRES) newWidth = XRES;
 	if (newHeight>YRES) newHeight = YRES;
-	newBlockWidth = newWidth/CELL;
-	newBlockHeight = newHeight/CELL;
+
+	int x, y, nx, ny, newBlockWidth = newWidth / CELL, newBlockHeight = newHeight / CELL;
+	vector2d pos, vel;
 
 	unsigned char ** blockMapNew;
 	float **fanVelXNew, **fanVelYNew, **pressureNew, **velocityXNew, **velocityYNew, **ambientHeatNew;

src/client/GameSave.h

@@ -76,7 +76,9 @@ class GameSave
 	void setSize(int width, int height);
 	char * Serialise(unsigned int & dataSize);
 	std::vector<char> Serialise();
+	void Translate(vector2d translate);
 	void Transform(matrix2d transform, vector2d translate);
+	void Transform(matrix2d transform, vector2d translate, int newWidth, int newHeight);
 
 	void Expand();
 	void Collapse();

src/gui/game/GameController.cpp

@@ -544,9 +544,8 @@ void GameController::LoadStamp(GameSave *stamp)
 
 void GameController::TranslateSave(ui::Point point)
 {
-	matrix2d transform = m2d_identity;
 	vector2d translate = v2d_new(point.X, point.Y);
-	gameModel->GetPlaceSave()->Transform(transform, translate);
+	gameModel->GetPlaceSave()->Translate(translate);
 	gameModel->SetPlaceSave(gameModel->GetPlaceSave());
 }