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README.md
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README.md
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# spritesheet_generator
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This is a simple program to generate a template for isometric sprite
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tilesheets, in png format. For use with software such as [Tiled](https://www.mapeditor.org).
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## Installation
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`go install github.com/tardisx/spritesheet_generator@latest`
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If you really want binaries, pester me :-)
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## Usage
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`Usage of ./spritesheet_generator:
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-height int
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base tile height in pixels (default 128)
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-multiplier int
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tile height multiplier (default 2)
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-output string
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output filename
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-width int
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tile width in pixels (default 128)
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-x int
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number of tiles across (default 8)
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-y int
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number of tiles down (default 8)`
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Hopefully these options are mostly self-explanatory.
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The `multiplier` option describes how 'tall' the tiles are. Normally you
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want some height to tiles to give them the illusion of depth and the ability
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to hide things behind them. If you are unsure, start with the default of 2.
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## Example
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![Screenshot][screenshot]
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[screenshot]: https://raw.githubusercontent.com/tardisx/spritesheet_generator/main/example.png
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BIN
example.png
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BIN
example.png
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After Width: | Height: | Size: 23 KiB |
5
go.mod
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5
go.mod
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module github.com/tardisx/spritesheet_generator
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go 1.19
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require golang.org/x/image v0.2.0
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26
go.sum
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go.sum
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github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
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golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
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golang.org/x/image v0.2.0 h1:/DcQ0w3VHKCC5p0/P2B0JpAZ9Z++V2KOo2fyU89CXBQ=
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golang.org/x/image v0.2.0/go.mod h1:la7oBXb9w3YFjBqaAwtynVioc1ZvOnNteUNrifGNmAI=
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golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
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golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
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golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
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golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
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golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
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golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
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golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
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golang.org/x/text v0.5.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
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golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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golang.org/x/tools v0.1.12/go.mod h1:hNGJHUnrk76NpqgfD5Aqm5Crs+Hm0VOH/i9J2+nxYbc=
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golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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248
main.go
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main.go
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package main
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import (
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"flag"
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"fmt"
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"image"
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"image/color"
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"image/png"
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"os"
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"golang.org/x/image/font"
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"golang.org/x/image/font/basicfont"
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"golang.org/x/image/math/fixed"
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)
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type tile struct {
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X int
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Y int
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}
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type pt struct {
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x int
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y int
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}
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func main() {
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var tileWidth, tileHeight, multiplier int
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var xTiles, yTiles int
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var output string
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flag.IntVar(&tileWidth, "width", 128, "tile width in pixels")
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flag.IntVar(&tileHeight, "height", 128, "base tile height in pixels")
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flag.IntVar(&multiplier, "multiplier", 2, "tile height multiplier")
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flag.IntVar(&xTiles, "x", 8, "number of tiles across")
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flag.IntVar(&yTiles, "y", 8, "number of tiles down")
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flag.StringVar(&output, "output", "", "output filename")
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flag.Parse()
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if output == "" {
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flag.Usage()
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os.Exit(1)
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}
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t := tile{tileWidth, tileHeight}
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width := xTiles * t.X
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height := yTiles * t.Y
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upLeft := image.Point{0, 0}
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lowRight := image.Point{width, height}
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img := image.NewRGBA(image.Rectangle{upLeft, lowRight})
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for x := 0; x < xTiles; x++ {
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for y := 0; y < yTiles; y++ {
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drawDiamond(img, t, x, y, multiplier)
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}
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}
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// Encode as PNG.
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f, err := os.Create(output)
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if err != nil {
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fmt.Printf("could not output to %s - %s", output, err)
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os.Exit(1)
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}
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png.Encode(f, img)
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f.Close()
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}
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func drawDiamond(img *image.RGBA, t tile, x int, y int, multiplier int) {
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tileX := x * t.X
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tileY := y * t.Y
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yTop := t.Y - (t.Y / multiplier)
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yMid := t.Y - (t.Y / (multiplier * 2))
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pt1 := pt{tileX, tileY + yMid} // left middle
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pt2 := pt{tileX + t.X/2, tileY + t.Y} // bottom
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pt3 := pt{tileX + t.X - 1, tileY + yMid} // right
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pt4 := pt{tileX + t.X/2, tileY + yTop} // top
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drawLine(img, pt1.x, pt1.y, pt2.x, pt2.y, color.Black)
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drawLine(img, pt2.x, pt2.y, pt3.x, pt3.y, color.Black)
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drawLine(img, pt3.x, pt3.y, pt4.x, pt4.y, color.Black)
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drawLine(img, pt4.x, pt4.y, pt1.x, pt1.y, color.Black)
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addLabel(img, tileX+t.X/2-10, tileY+30, fmt.Sprintf("%d,%d", x, y))
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// tl => bl
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drawLine(img, tileX, tileY, tileX, tileY+t.Y-1, color.White)
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// bl => br
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drawLine(img, tileX, tileY+t.Y-1, tileX+t.X-1, tileY+t.Y-1, color.White)
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// br => tr
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drawLine(img, tileX+t.X-1, tileY+t.Y-1, tileX+t.X-1, tileY, color.White)
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// tr => tl
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drawLine(img, tileX+t.X-1, tileY, tileX, tileY, color.White)
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}
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// thanks to https://github.com/StephaneBunel/bresenham
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func drawLine(img *image.RGBA, x1, y1, x2, y2 int, col color.Color) {
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var dx, dy, e, slope int
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// Because drawing p1 -> p2 is equivalent to draw p2 -> p1,
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// I sort points in x-axis order to handle only half of possible cases.
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if x1 > x2 {
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x1, y1, x2, y2 = x2, y2, x1, y1
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}
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dx, dy = x2-x1, y2-y1
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// Because point is x-axis ordered, dx cannot be negative
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if dy < 0 {
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dy = -dy
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}
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switch {
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// Is line a point ?
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case x1 == x2 && y1 == y2:
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img.Set(x1, y1, col)
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// Is line an horizontal ?
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case y1 == y2:
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for ; dx != 0; dx-- {
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img.Set(x1, y1, col)
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x1++
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}
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img.Set(x1, y1, col)
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// Is line a vertical ?
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case x1 == x2:
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if y1 > y2 {
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y1, y2 = y2, y1
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}
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for ; dy != 0; dy-- {
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img.Set(x1, y1, col)
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y1++
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}
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img.Set(x1, y1, col)
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// Is line a diagonal ?
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case dx == dy:
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if y1 < y2 {
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for ; dx != 0; dx-- {
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img.Set(x1, y1, col)
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x1++
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y1++
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}
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} else {
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for ; dx != 0; dx-- {
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img.Set(x1, y1, col)
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x1++
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y1--
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}
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}
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img.Set(x1, y1, col)
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// wider than high ?
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case dx > dy:
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if y1 < y2 {
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// BresenhamDxXRYD(img, x1, y1, x2, y2, col)
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dy, e, slope = 2*dy, dx, 2*dx
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for ; dx != 0; dx-- {
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img.Set(x1, y1, col)
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x1++
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e -= dy
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if e < 0 {
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y1++
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e += slope
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}
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}
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} else {
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// BresenhamDxXRYU(img, x1, y1, x2, y2, col)
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dy, e, slope = 2*dy, dx, 2*dx
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for ; dx != 0; dx-- {
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img.Set(x1, y1, col)
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x1++
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e -= dy
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if e < 0 {
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y1--
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e += slope
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}
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}
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}
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img.Set(x2, y2, col)
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// higher than wide.
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default:
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if y1 < y2 {
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// BresenhamDyXRYD(img, x1, y1, x2, y2, col)
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dx, e, slope = 2*dx, dy, 2*dy
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for ; dy != 0; dy-- {
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img.Set(x1, y1, col)
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y1++
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e -= dx
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if e < 0 {
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x1++
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e += slope
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}
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}
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} else {
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// BresenhamDyXRYU(img, x1, y1, x2, y2, col)
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dx, e, slope = 2*dx, dy, 2*dy
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for ; dy != 0; dy-- {
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img.Set(x1, y1, col)
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y1--
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e -= dx
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if e < 0 {
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x1++
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e += slope
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}
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}
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}
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img.Set(x2, y2, col)
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}
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}
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func addLabel(img *image.RGBA, x, y int, label string) {
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col := color.RGBA{20, 20, 240, 255}
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point := fixed.Point26_6{X: fixed.I(x), Y: fixed.I(y)}
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d := &font.Drawer{
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Dst: img,
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Src: image.NewUniform(col),
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Face: basicfont.Face7x13,
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Dot: point,
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}
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d.DrawString(label)
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}
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// // Colors are defined by Red, Green, Blue, Alpha uint8 values.
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// cyan := color.RGBA{100, 200, 200, 0xff}
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// // Set color for each pixel.
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// for x := 0; x < width; x++ {
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// for y := 0; y < height; y++ {
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// switch {
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// case x < width/2 && y < height/2: // upper left quadrant
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// img.Set(x, y, cyan)
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// case x >= width/2 && y >= height/2: // lower right quadrant
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// img.Set(x, y, color.White)
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// default:
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// // Use zero value.
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// }
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// }
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// }
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