if you want to show the whole level you need the level border coordination ( as example -200,200,-200,200)
and then the position of the entities you want to show on the minimap

if the size of the minimap is 100x100

set a panel to the right position:

var level_width[2]=200,-200;
var level_height[2]=200,-200;
var minimap_size[2]=100,100;
entity* entity_pointer;

[...]

panel_e1.pos_x = minimap_pan.pos_x + minimap_size.x * (entity_pointer.x/(level_width[1]-level_width[2]));
panel_e1.pos_y = minimap_pan.pos_y + minimap_size.y * (entity_pointer.y/(level_height[1]-level_height[2]));