LuaDrawing.wiki
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#summary Drawing maps with Lua.
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= Drawing Maps With Lua (OUTDATED) =
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Starting in 0.9.18 it is possible to reliably use drawn map mode to draw maps with scripts.
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A simple example is given below.  Note that Drawn maps use an area of 4096x2048.  The examples below are static, but obviously this could be used for a random map variation - for example, simulating the Cave map by doing the fill below, then drawing random tunnels using circles that shift their course smoothly.
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= Details =
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First, a couple of convenience functions for drawing to the map.
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<code lang="lua">
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PointsBuffer = ''  -- A string to accumulate points in
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function AddPoint(x, y, width, erase)
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    PointsBuffer = PointsBuffer .. string.char(band(x,0xff00) / 256 , band(x,0xff) , band(y,0xff00) / 256 , band(y,0xff))
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    if width then
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        width = bor(width,0x80)
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        if erase then
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            width = bor(width,0x40)
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        end
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        PointsBuffer = PointsBuffer .. string.char(width)
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    else
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        PointsBuffer = PointsBuffer .. string.char(0)
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    end
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    if #PointsBuffer > 245 then
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        ParseCommand('draw '..PointsBuffer)
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        PointsBuffer = ''
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    end
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end
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function FlushPoints()
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    if #PointsBuffer > 0 then
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        ParseCommand('draw '..PointsBuffer)
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        PointsBuffer = ''
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    end
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end
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</code>
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AddPoint takes an x and y location for the point, a width (indicates the start of a new line) and erase (whether the line is erasing from the map).  The width calculation is described in [DrawnMapFormat].
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FlushPoints writes out any values from PointsBuffer that have not already been sent to the engine.
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It would be called at the end of a drawing session.
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A simple example below.
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<code lang="lua">
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function onGameInit()
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    MapGen = 2
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    TemplateFilter = 0
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    AddPoint(100,100,10)
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    AddPoint(2000,2000)
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    AddPoint(2000,100,10)
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    AddPoint(100,2000)
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    AddPoint(1000,1000,63,true)
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    AddPoint(1000,1000,20)
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    for i = 63,2,-4 do
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        AddPoint(2000,1000,i)
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        AddPoint(2000,1000,i-2,true)
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    end
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    for i = 1,2000,50 do
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        AddPoint(i+2000,2000,1)
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        AddPoint(4000,2000-i)
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    end
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    AddPoint(2000,2000,1)
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    AddPoint(4000,2000)
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    AddPoint(4000,0,1)
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    AddPoint(4000,2000)
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    FlushPoints()
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end
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</code>
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The first set of AddPoints draws a large X and erases the centre.
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The following loop draws a set of nested points, alternating erasure and fill, which results in a set of concentric circles.
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The 2nd loop draws a web of lines and frames it using some final AddPoints.
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<a href="http://m8y.org/hw/draw1.jpeg">screenshot here</a>
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Another brief example.
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<code lang="lua">
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    for i = 200,2000,600 do
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        AddPoint(1,i,63)
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        AddPoint(4000,i)
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    end
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    for i = 500,3500,1000 do
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        AddPoint(i,1000,63,true)
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    end
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    FlushPoints()
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</code>
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This one fills the map with solid land, and draws 4 circular erased points in it.
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4c759fad66cf Edited wiki page LuaDrawing through web user interface.
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<a href="http://m8y.org/hw/draw2.jpeg">screenshot here</a>