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Line 10: − * Things placed in the world have a ''[[#Tiles|tile position]]'', relative to the top-left corner of the map.+ − * Things in the world may also have an ''absolute pixel position'', relative to the top-left corner of the map. To convert a tile coordinate to a pixel coordinate, multiply it by <tt>Game1.tileSize</tt>; divide by <tt>Game1.tileSize</tt> for the reverse.+ − * Items are usually drawn on the screen using a ''screen pixel position'', relative to the top-left corner of the visible screen. To convert an absolute pixel coordinate to a screen coordinate, subtract it from <tt>Game1.viewport.X</tt> and <tt>Game1.viewport.Y</tt>.+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
Modding:Modder Guide/Game Fundamentals (view source)
Revision as of 16:06, 15 September 2018
, 16:06, 15 September 2018→Positions: add conversion formulas, reformat for readability
===Positions===
===Positions===
The game uses three related coordinate systems:
The game uses three related coordinate systems:
{| class="wikitable"
|-
! coordinate system
! relative to
! notes
|-
| tile position
| top-left corner of the map
| measured in [[#Tiles|tiles]]; used when placing things on the map (e.g. <tt>location.Objects</tt> uses tile positions).
|-
| absolute position
| top-left corner of the map
| measured in pixels; used when more granular measurements are needed (e.g. NPC movement).
|-
| screen position
| top-left corner of the visible screen
| measured in pixels; used when drawing to the screen.
|}
Here's how to convert between them:
{| class="wikitable"
|-
!colspan="3"| conversion
! formula
|-
| absolute || → || screen
| <code>x - Game1.viewport.X, y - Game1.viewport.Y</code>
|-
| absolute || → || tile
| <code>x / Game1.tileSize, y / Game1.tileSize</code>
|-
| screen || → || absolute
| <code>x + Game1.viewport.X, y + Game1.viewport.Y</code>
|-
| screen || → || tile
| <code>(x + Game1.viewport.X) / Game1.tileSize, (y + Game1.viewport.Y) / Game1.tileSize</code>
|-
| tile || → || absolute
| <code>x * Game1.tileSize, y * Game1.tileSize</code>
|-
| tile || → || screen
| <code>(x * Game1.tileSize) - Game1.viewport.X, (y * Game1.tileSize) - Game1.viewport.Y</code>
|}
===Net fields===
===Net fields===