69 lines
1.8 KiB
Lua
69 lines
1.8 KiB
Lua
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local function clamp(v, min, max)
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if v > max then
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return max
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elseif v < min then
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return min
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else
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return v
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end
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end
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local function color_adjust(c, v)
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return {
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a = c.a,
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r = clamp(c.r + v, 0, 255),
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g = clamp(c.g + v, 0, 255),
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b = clamp(c.b + v, 0, 255)
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}
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end
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function isogen.draw(pos1, pos2, cube_len)
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local min, max = vector.sort(pos1, pos2)
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cube_len = cube_len or 24
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minetest.load_area(min, max)
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local size = vector.add(vector.subtract(max, min), 1)
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local width, height = isogen.calculate_image_size(size, cube_len)
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local center_x, center_y = isogen.get_center_cube_offset(size, cube_len)
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local canvas = isogen.create_canvas(width, height)
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local ipos = vector.new(1, -1, 1)
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local list = {}
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-- top layer
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for x=min.x, max.x do
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for z=min.z, max.z do
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isogen.probe_position(min, max, vector.new(x, max.y, z), ipos, list)
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end
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end
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-- left layer (without top stride)
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for x=min.x, max.x do
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for y=min.y, max.y-1 do
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isogen.probe_position(min, max, vector.new(x, y, min.z), ipos, list)
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end
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end
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-- right layer (without top and left stride)
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for z=min.z+1, max.z do
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for y=min.y, max.y-1 do
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isogen.probe_position(min, max, vector.new(min.x, y, z), ipos, list)
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end
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end
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table.sort(list, function(a, b)
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return a.order < b.order
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end)
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for _, entry in ipairs(list) do
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local rel_pos = vector.subtract(entry.pos, min)
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local color = entry.color
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local x, y = isogen.get_cube_position(center_x, center_y, cube_len, 0, rel_pos)
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isogen.draw_cube(canvas, cube_len, x, y, color, color_adjust(color, -10), color_adjust(color, 10))
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end
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return canvas:png()
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end
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