libcraftos/paintutils.lua at master · Phoenix-ComputerCraft/libcraftos · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
local expect = require "cc.expect"
local syscall = require "_syscall"
local term = require "term"

local paintutils = {}

function paintutils.drawPixel(x, y, color)
    expect(1, x, "number")
    expect(2, y, "number")
    local ox, oy = term.getCursorPos()
    local c = term.getBackgroundColor()
    term.setCursorPos(x, y)
    if color then term.setBackgroundColor(color) end
    term.write(" ")
    term.setCursorPos(ox, oy)
    term.setBackgroundColor(c)
end

local function drawLineInternal(sp, x1, y1, x2, y2)
    if math.abs(y2 - y1) < math.abs(x2 - x1) then
        if x1 > x2 then x1, y1, x2, y2 = x2, y2, x1, y1 end
        local dx, dy, yi = x2 - x1, y2 - y1, 1
        if dy < 0 then yi, dy = -1, -dy end
        local D, y = 2*dy - dx, y1
        if yi < 0 then
            y = y2
            for x = x2, x1, -1 do
                sp(x, y)
                if D > 0 then
                    y = y + 1
                    D = D + 2*(dy - dx)
                else
                    D = D + 2*dy
                end
            end
        else
            for x = x1, x2 do
                sp(x, y)
                if D > 0 then
                    y = y + 1
                    D = D + 2*(dy - dx)
                else
                    D = D + 2*dy
                end
            end
        end
    else
        if y1 > y2 then x1, y1, x2, y2 = x2, y2, x1, y1 end
        local dx, dy, xi = x2 - x1, y2 - y1, 1
        if dx < 0 then xi, dx = -1, -dx end
        local D, x = 2*dx - dy, x1
        for y = y1, y2 do
            sp(x, y)
            if D > 0 then
                x = x + xi
                D = D + 2*(dx - dy)
            else
                D = D + 2*dx
            end
        end
    end
end

function paintutils.drawLine(x1, y1, x2, y2, color)
    expect(1, x1, "number")
    expect(2, y1, "number")
    expect(3, x2, "number")
    expect(4, y2, "number")
    expect(5, color, "number")
    if y1 == y2 then
        local width = math.abs(x2 - x1) + 1
        local b, f = term.getBackgroundColor(), term.getTextColor()
        local ox, oy = term.getCursorPos()
        local fg, bg = ("%x"):format(f), ("%x"):format(color)
        term.setCursorPos(x1, y1)
        term.blit((" "):rep(width), fg:rep(width), bg:rep(width))
        term.setCursorPos(ox, oy)
        term.setBackgroundColor(b)
        return
    end
    local sp, rst
    local c = term.getBackgroundColor()
    local ox, oy = term.getCursorPos()
    term.setBackgroundColor(color)
    sp, rst = function(x, y)
        term.setCursorPos(x, y)
        term.write(" ")
    end, function()
        term.setBackgroundColor(c)
        term.setCursorPos(ox, oy)
    end
    drawLineInternal(sp, x1, y1, x2, y2)
    rst()
end

function paintutils.drawBox(x, y, width, height, color)
    expect(1, x, "number")
    expect(2, y, "number")
    expect(3, width, "number")
    expect(4, height, "number")
    expect(5, color, "number")
    local b, f = term.getBackgroundColor(), term.getTextColor()
    local ox, oy = term.getCursorPos()
    local fg, bg = ("%x"):format(f), ("%x"):format(color)
    term.setCursorPos(x, y)
    term.blit((" "):rep(width), fg:rep(width), bg:rep(width))
    term.setCursorPos(x, y+height-1)
    term.blit((" "):rep(width), fg:rep(width), bg:rep(width))
    for py = y + 1, y + height - 2 do
        term.setCursorPos(x, py)
        term.blit(" ", fg, bg)
        term.setCursorPos(x+width-1, py)
        term.blit(" ", fg, bg)
    end
    term.setBackgroundColor(b)
    term.setCursorPos(ox, oy)
end

function paintutils.drawFilledBox(x, y, width, height, color)
    expect(1, x, "number")
    expect(2, y, "number")
    expect(3, width, "number")
    expect(4, height, "number")
    expect(5, color, "number")
    local b, f = term.getBackgroundColor(), term.getTextColor()
    local ox, oy = term.getCursorPos()
    local text, fg, bg = (" "):rep(width), ("%x"):format(f):rep(width), ("%x"):format(color):rep(width)
    for py = y, y + height - 1 do
        term.setCursorPos(x, py)
        term.blit(text, fg, bg)
    end
    term.setBackgroundColor(b)
    term.setCursorPos(ox, oy)
end

function paintutils.drawImage(x, y, image)
    expect(1, x, "number")
    expect(2, y, "number")
    expect(3, image, "table")
    for i, line in ipairs(image) do
        term.setCursorPos(x, y + i - 1)
        for _, c in ipairs(line) do
            term.setBackgroundColor(c)
            term.write(" ")
        end
    end
end

function paintutils.parseImage(image)
    expect(1, image, "string")
    local retval = {}
    for line in image:gmatch "[^\n]+" do
        local l = {}
        for c in line:gmatch "." do l[#l+1] = tonumber(c, 16) end
        retval[#retval+1] = l
    end
    return retval
end

function paintutils.loadImage(path)
    expect(1, path, "string")
    local file = syscall.open(path, "r")
    if not file then return nil end
    local data = file.readAll()
    file.close()
    return paintutils.parseImage(data)
end

return paintutils