javascript - I want to build a minimap for my HTML5 game, how do I start? -

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assume have big map uses background image pattern. want place minimap @ corner when moving player around. need minimap display player in big map , other sprites in map, using coarse representation , keeping relative location shows in smaller map. think basic , simple minimap. player in middle of screen (i have done that) , minimap stay @ corner of screen. if want build such feature game, how start?

assuming main map in container element, need measure scroll property of element establish @ position relative center of container (or screen). enter image description here

if calculate x , y proportion (eg %) of map, can place on mini map @ same relative position.

the placing of mini map on main map of no importance.

to position of map relative screen, try document.getelementbyid("map").getboundingclientrect(). x , y values in resulting array tell position of top left of map top left of screen. width , height of map included in array. add screen.width/2 , screen height/2 coordinates of map in center of screen.


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