mirror of
https://github.com/OpenDiablo2/OpenDiablo2
synced 2024-06-13 19:20:43 +00:00
92 lines
2.5 KiB
Go
92 lines
2.5 KiB
Go
package d2vector
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import (
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"fmt"
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"math"
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)
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const subTilesPerTile float64 = 5
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// Position is a vector in world space. The stored value is the one returned by Position.World()
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type Position struct {
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Vector
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}
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// NewPosition creates a new Position at the given float64 world position.
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func NewPosition(x, y float64) Position {
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p := Position{NewVector(x, y)}
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p.checkValues()
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return p
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}
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// EntityPosition returns a Position struct based on the given entity spawn point.
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// The value given should be the one set in d2mapstamp.Stamp.Entities:
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// (tileOffsetX*5)+object.X, (tileOffsetY*5)+object.Y
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// TODO: This probably doesn't support positions in between sub tiles so will only be suitable for spawning entities from map generation, not for multiplayer syncing.
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func EntityPosition(x, y int) Position {
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return NewPosition(float64(x)/5, float64(y)/5)
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}
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// Set sets this position to the given x and y values.
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func (p *Position) Set(x, y float64) {
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p.x, p.y = x, y
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p.checkValues()
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}
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func (p *Position) checkValues() {
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if math.IsNaN(p.x) || math.IsNaN(p.y) {
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panic(fmt.Sprintf("float value is NaN: %s", p.Vector))
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}
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if math.IsInf(p.x, 0) || math.IsInf(p.y, 0) {
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panic(fmt.Sprintf("float value is Inf: %s", p.Vector))
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}
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}
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// World is the position, where 1 = one map tile.
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// unused
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func (p *Position) World() *Vector {
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return &p.Vector
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}
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// Tile is the tile position, always a whole number. (tileX, tileY)
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func (p *Position) Tile() *Vector {
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c := p.World().Clone()
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return c.Floor()
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}
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// TileOffset is the offset from the tile position, always < 1.
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// unused
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func (p *Position) TileOffset() *Vector {
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c := p.World().Clone()
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return c.Subtract(p.Tile())
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}
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// SubWorld is the position, where 5 = one map tile. (locationX, locationY)
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func (p *Position) SubWorld() *Vector {
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c := p.World().Clone()
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return c.Scale(subTilesPerTile)
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}
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// SubTile is the tile position in sub tiles, always a multiple of 5.
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// unused
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func (p *Position) SubTile() *Vector {
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return p.Tile().Scale(subTilesPerTile)
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}
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// SubTileOffset is the offset from the sub tile position in sub tiles, always < 1.
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// unused
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func (p *Position) SubTileOffset() *Vector {
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return p.SubWorld().Subtract(p.SubTile())
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}
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// TODO: understand this and maybe improve/remove it
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// SubTileOffset() + 1. It's used for rendering. It seems to always do this:
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// v.offsetX+int((v.subcellX-v.subcellY)*16),
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// v.offsetY+int(((v.subcellX+v.subcellY)*8)-5),
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// ^ Maybe similar to Viewport.OrthoToWorld? (subCellX, subCellY)
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func (p *Position) SubCell() *Vector {
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return p.SubTileOffset().AddScalar(1)
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}
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