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// mapper is a very simple map renderer.
package main
import (
"flag"
"fmt"
"github.com/kch42/gomcmap/mcmap"
"image"
"image/png"
"os"
)
func main() {
path := flag.String("path", "", "Path to region directory")
output := flag.String("output", "map.png", "File to write image to")
flag.Parse()
if *path == "" {
flag.Usage()
os.Exit(1)
}
region, err := mcmap.OpenRegion(*path, true)
if err != nil {
fmt.Fprintf(os.Stderr, "Could not open region: %s\n", err)
os.Exit(1)
}
xmin, xmax, zmin, zmax := region.MaxDims()
w := (xmax - xmin) * mcmap.ChunkSizeXZ
h := (zmax - zmin) * mcmap.ChunkSizeXZ
img := image.NewRGBA(image.Rect(0, 0, w, h))
chunkLoop:
for chunkPos := range region.AllChunks() {
cx, cz := chunkPos.X, chunkPos.Z
chunk, err := region.Chunk(cx, cz)
switch err {
case nil:
case mcmap.NotAvailable:
continue chunkLoop
default:
fmt.Fprintf(os.Stderr, "Error while getting chunk (%d, %d): %s\n", cx, cz, err)
os.Exit(1)
}
for x := 0; x < mcmap.ChunkSizeXZ; x++ {
scanZ:
for z := 0; z < mcmap.ChunkSizeXZ; z++ {
ax, az := mcmap.ChunkToBlock(cx, cz, x, z)
for y := mcmap.ChunkSizeY; y >= 0; y-- {
blk := chunk.Block(x, y, z)
c, ok := colors[blk.ID]
if ok {
img.Set(ax-(xmin*mcmap.ChunkSizeXZ), az-(zmin*mcmap.ChunkSizeXZ), c)
continue scanZ
}
}
img.Set(ax-(xmin*mcmap.ChunkSizeXZ), az-(zmin*mcmap.ChunkSizeXZ), rgb(0x000000))
}
}
if err := chunk.MarkUnused(); err != nil {
fmt.Fprintf(os.Stderr, "Error while unloading chunk %d, %d: %s\n", cx, cz, err)
os.Exit(1)
}
}
f, err := os.Create(*output)
if err != nil {
fmt.Fprintf(os.Stderr, "Could not write image: %s", err)
os.Exit(1)
}
defer f.Close()
if err := png.Encode(f, img); err != nil {
fmt.Fprintf(os.Stderr, "Could not write image: %s", err)
os.Exit(1)
}
}
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