Hi there,
I'm using this code, maybe this can help you:
Step event:
if (direction<=90) or (direction>=270) {
image_xscale = 1;
}
else {image_xscale = -1;}
}
Draw event:
draw_skeleton(spr_spine_warrior, animation, skin, frame, x, y, image_xscale, 1, image_angle, c_white, 1);
So when my warrior faces left or right, the xscale changes.