add XY struct for 2d points and offsets

1 files changed, 2 insertions, 8 deletions

diff --git a/StepTileCommand.cpp b/StepTileCommand.cpp
index bac9f5d..beefd34 100644
--- a/StepTileCommand.cpp
+++ b/StepTileCommand.cpp
@@ -3,16 +3,10 @@
 
 using namespace std;
 
-StepTileCommand::StepTileCommand(Canvas & c, pair<unsigned int, unsigned int> tile) : canvas(c) {
-	this->x = tile.first;
-	this->y = tile.second;
-}
+StepTileCommand::StepTileCommand(Canvas & c, const XY & tile) : canvas(c), tile_pos(tile) { }
 
 void StepTileCommand::execute() {
-	Canvas & canvas = this->canvas;
-	if (this->x >= canvas.data.columns) return;
-	if (this->y >= canvas.data.rows) return;
-	Tile & tile = canvas.get_tile(this->x, this->y);
+	Tile & tile = this->canvas.get_tile(this->tile_pos);
 	tile.behavior->step(nullptr);
 	tile.update();
 }