simon
1300e8d103
some functions from heightmap into utils; added a -archive option to buildall as first step towards auto-building a Debian package for Raspberry Pi.
78 lines
3.1 KiB
Clojure
78 lines
3.1 KiB
Clojure
;; Functions to apply a heightmap to a world.
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;;
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;; Heightmaps are considered only as greyscale images, so colour is redundent (will be
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;; ignored). Darker shades are higher.
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(ns mw-engine.heightmap
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(:import [java.awt.image BufferedImage])
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(:use mw-engine.utils
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mw-engine.world
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mw-engine.drainage)
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(:require [fivetonine.collage.util :as collage :only [load-image]]
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[mikera.image.core :as imagez :only [filter-image get-pixels]]
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[mikera.image.filters :as filters]))
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(defn tag-gradient
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"Set the `gradient` property of this `cell` of this `world` to the difference in
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altitude between its highest and lowest neghbours."
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[world cell]
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(let [heights (remove nil? (map #(:altitude %) (get-neighbours world cell)))
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highest (cond (empty? heights) 0 ;; shouldn't happen
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true (apply max heights))
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lowest (cond (empty? heights) 0 ;; shouldn't
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true (apply min heights))
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gradient (- highest lowest)]
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(merge cell {:gradient gradient})))
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(defn tag-gradients
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"Set the `gradient` property of each cell in this `world` to the difference in
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altitude between its highest and lowest neghbours."
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[world]
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(map-world world tag-gradient))
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(defn tag-altitude
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"Set the altitude of this cell from the corresponding pixel of this heightmap.
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If the heightmap you supply is smaller than the world, this will break.
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* `world` not actually used, but present to enable this function to be
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passed as an argument to `mw-engine.utils/map-world`, q.v.
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* `cell` a cell, as discussed in world.clj, q.v. Alternatively, a map;
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* `heightmap` an (ideally) greyscale image, whose x and y dimensions should
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exceed those of the world of which the `cell` forms part."
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([world cell heightmap]
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(tag-altitude cell heightmap))
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([cell heightmap]
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(merge cell
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{:altitude
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(+ (get-int cell :altitude)
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(- 256
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(abs
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(mod
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(.getRGB heightmap
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(get-int cell :x)
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(get-int cell :y)) 256))))})))
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(defn apply-heightmap
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"Apply the image file loaded from this path to this world, and return a world whose
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altitudes are modified (added to) by the altitudes in the heightmap. It is assumed that
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the heightmap is at least as large in x and y dimensions as the world.
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* `world` a world, as defined in `world.clj`, q.v.; if world is not supplied,
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a world the size of the heightmap will be created.
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* `imagepath` a file path or URL which indicates an image file."
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([world imagepath]
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(let [heightmap (imagez/filter-image
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(filters/grayscale)
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(collage/load-image imagepath))]
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(map-world
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(map-world world tag-altitude (list heightmap))
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tag-gradient)))
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([imagepath]
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(let [heightmap (imagez/filter-image
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(filters/grayscale)
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(collage/load-image imagepath))
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world (make-world (.getWidth heightmap) (.getHeight heightmap))]
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(map-world
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(map-world world tag-altitude (list heightmap))
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tag-gradient))))
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