surprise_dungeon/objects/oMonster/Step_0.gml

// deplacement monstre

if dureeDeplacement != 0 {
	x += deplaceHorizontal;
	y += deplaceVertical;
	dureeDeplacement --;
}
else {
	deplaceHorizontal = 0;
	deplaceVertical = 0;
	dir = irandom(3);
switch(dir) {
	case 0 : deplaceVertical = 1; break;
	case 1 : deplaceHorizontal = 1; break;
	case 2 : deplaceVertical = -1; break;
	case 3 : deplaceHorizontal = -1; break;
 }		
	
	dureeDeplacement = 120;
}

// collision avec un mur

if place_meeting(x,y,oWall) {
	if (dir > 1) dir -= 2;
	else dir += 2;	
	
	switch(dir) {
	case 0 : deplaceVertical = 1; break;
	case 1 : deplaceHorizontal = 1; break;
	case 2 : deplaceVertical = -1; break;
	case 3 : deplaceHorizontal = -1; break;
	}		
	
	dureeDeplacement = 120;
}