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Use blit to draw boxes, add colors.toBlit (#570)

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Drew Lemmy 2020-11-01 19:28:18 +00:00 committed by GitHub
parent 666e83cf4f
commit 741adfa7bb
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4 changed files with 184 additions and 51 deletions
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18
src/main/resources/data/computercraft/lua/rom/apis/colors.lua
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@ -332,3 +332,21 @@ function rgb8(r, g, b)
return packRGB(r, g, b)
end
end
-- Colour to hex lookup table for toBlit
local color_hex_lookup = {}
for i = 0, 15 do
color_hex_lookup[2 ^ i] = string.format("%x", i)
end
--- Converts the given color to a paint/blit hex character (0-9a-f).
--
-- This is equivalent to converting floor(log_2(color)) to hexadecimal.
--
-- @tparam number color The color to convert.
-- @treturn string The blit hex code of the color.
function toBlit(color)
expect(1, color, "number")
return color_hex_lookup[color] or
string.format("%x", math.floor(math.log(color) / math.log(2)))
end

98
src/main/resources/data/computercraft/lua/rom/apis/paintutils.lua
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@ -23,6 +23,25 @@ local function parseLine(tImageArg, sLine)
table.insert(tImageArg, tLine)
end
-- Sorts pairs of startX/startY/endX/endY such that the start is always the min
local function sortCoords(startX, startY, endX, endY)
local minX, maxX, minY, maxY
if startX <= endX then
minX, maxX = startX, endX
else
minX, maxX = endX, startX
end
if startY <= endY then
minY, maxY = startY, endY
else
minY, maxY = endY, startY
end
return minX, maxX, minY, maxY
end
--- Parses an image from a multi-line string
--
-- @tparam string image The string containing the raw-image data.
@ -71,9 +90,6 @@ function drawPixel(xPos, yPos, colour)
expect(2, yPos, "number")
expect(3, colour, "number", "nil")
if type(xPos) ~= "number" then error("bad argument #1 (expected number, got " .. type(xPos) .. ")", 2) end
if type(yPos) ~= "number" then error("bad argument #2 (expected number, got " .. type(yPos) .. ")", 2) end
if colour ~= nil and type(colour) ~= "number" then error("bad argument #3 (expected number, got " .. type(colour) .. ")", 2) end
if colour then
term.setBackgroundColor(colour)
end
@ -111,17 +127,7 @@ function drawLine(startX, startY, endX, endY, colour)
return
end
local minX = math.min(startX, endX)
local maxX, minY, maxY
if minX == startX then
minY = startY
maxX = endX
maxY = endY
else
minY = endY
maxX = startX
maxY = startY
end
local minX, maxX, minY, maxY = sortCoords(startX, startY, endX, endY)
-- TODO: clip to screen rectangle?
@ -177,37 +183,33 @@ function drawBox(startX, startY, endX, endY, nColour)
endY = math.floor(endY)
if nColour then
term.setBackgroundColor(nColour)
term.setBackgroundColor(nColour) -- Maintain legacy behaviour
else
nColour = term.getBackgroundColour()
end
local colourHex = colours.toBlit(nColour)
if startX == endX and startY == endY then
drawPixelInternal(startX, startY)
return
end
local minX = math.min(startX, endX)
local maxX, minY, maxY
if minX == startX then
minY = startY
maxX = endX
maxY = endY
else
minY = endY
maxX = startX
maxY = startY
end
local minX, maxX, minY, maxY = sortCoords(startX, startY, endX, endY)
local width = maxX - minX + 1
for x = minX, maxX do
drawPixelInternal(x, minY)
drawPixelInternal(x, maxY)
end
if maxY - minY >= 2 then
for y = minY + 1, maxY - 1 do
drawPixelInternal(minX, y)
drawPixelInternal(maxX, y)
for y = minY, maxY do
if y == minY or y == maxY then
term.setCursorPos(minX, y)
term.blit((" "):rep(width), colourHex:rep(width), colourHex:rep(width))
else
term.setCursorPos(minX, y)
term.blit(" ", colourHex, colourHex)
term.setCursorPos(maxX, y)
term.blit(" ", colourHex, colourHex)
end
end
end
--- Draws a filled box on the current term from the specified start position to
-- the specified end position.
--
@ -233,29 +235,23 @@ function drawFilledBox(startX, startY, endX, endY, nColour)
endY = math.floor(endY)
if nColour then
term.setBackgroundColor(nColour)
term.setBackgroundColor(nColour) -- Maintain legacy behaviour
else
nColour = term.getBackgroundColour()
end
local colourHex = colours.toBlit(nColour)
if startX == endX and startY == endY then
drawPixelInternal(startX, startY)
return
end
local minX = math.min(startX, endX)
local maxX, minY, maxY
if minX == startX then
minY = startY
maxX = endX
maxY = endY
else
minY = endY
maxX = startX
maxY = startY
end
local minX, maxX, minY, maxY = sortCoords(startX, startY, endX, endY)
local width = maxX - minX + 1
for x = minX, maxX do
for y = minY, maxY do
drawPixelInternal(x, y)
end
for y = minY, maxY do
term.setCursorPos(minX, y)
term.blit((" "):rep(width), colourHex:rep(width), colourHex:rep(width))
end
end

16
src/test/resources/test-rom/spec/apis/colors_spec.lua
View File

@ -73,4 +73,20 @@ describe("The colors library", function()
expect(colors.rgb8(0.3, 0.5, 0.6)):equals(0x4c7f99)
expect({ colors.rgb8(0x4c7f99) }):same { 0x4c / 0xFF, 0x7f / 0xFF, 0.6 }
end)
describe("colors.toBlit", function()
it("validates arguments", function()
expect.error(colors.toBlit, nil):eq("bad argument #1 (expected number, got nil)")
end)
it("converts all colors", function()
for i = 0, 15 do
expect(colors.toBlit(2 ^ i)):eq(string.format("%x", i))
end
end)
it("floors colors", function()
expect(colors.toBlit(16385)):eq("e")
end)
end)
end)

103
src/test/resources/test-rom/spec/apis/paintutils_spec.lua
View File

@ -1,4 +1,19 @@
local with_window = require "test_helpers".with_window
describe("The paintutils library", function()
-- Verifies that a window's lines are equal to the given table of blit
-- strings ({{"text", "fg", "bg"}, {"text", "fg", "bg"}...})
local function window_eq(w, state)
-- Verification of the size isn't really important in the tests, but
-- better safe than sorry.
local _, height = w.getSize()
expect(#state):eq(height)
for line = 1, height do
expect({ w.getLine(line) }):same(state[line])
end
end
describe("paintutils.parseImage", function()
it("validates arguments", function()
paintutils.parseImage("")
@ -28,6 +43,30 @@ describe("The paintutils library", function()
expect.error(paintutils.drawLine, 1, 1, 1, nil):eq("bad argument #4 (expected number, got nil)")
expect.error(paintutils.drawLine, 1, 1, 1, 1, false):eq("bad argument #5 (expected number, got boolean)")
end)
it("draws a line going across with custom colour", function()
local w = with_window(3, 2, function()
paintutils.drawLine(1, 1, 3, 1, colours.red)
end)
window_eq(w, {
{ " ", "000", "eee" },
{ " ", "000", "fff" },
})
end)
it("draws a line going diagonally with term colour", function()
local w = with_window(3, 3, function()
term.setBackgroundColour(colours.red)
paintutils.drawLine(1, 1, 3, 3)
end)
window_eq(w, {
{ " ", "000", "eff" },
{ " ", "000", "fef" },
{ " ", "000", "ffe" },
})
end)
end)
describe("paintutils.drawBox", function()
@ -38,6 +77,45 @@ describe("The paintutils library", function()
expect.error(paintutils.drawBox, 1, 1, 1, nil):eq("bad argument #4 (expected number, got nil)")
expect.error(paintutils.drawBox, 1, 1, 1, 1, false):eq("bad argument #5 (expected number, got boolean)")
end)
it("draws a box with term colour", function()
local w = with_window(3, 3, function()
term.setBackgroundColour(colours.red)
paintutils.drawBox(1, 1, 3, 3)
end)
window_eq(w, {
{ " ", "eee", "eee" },
{ " ", "e0e", "efe" },
{ " ", "eee", "eee" },
})
end)
it("draws a box with custom colour", function()
local w = with_window(3, 3, function()
paintutils.drawBox(1, 1, 3, 3, colours.red)
end)
window_eq(w, {
{ " ", "eee", "eee" },
{ " ", "e0e", "efe" },
{ " ", "eee", "eee" },
})
end)
it("draws a box without overwriting existing content", function()
local w = with_window(3, 3, function()
term.setCursorPos(2, 2)
term.write("a")
paintutils.drawBox(1, 1, 3, 3, colours.red)
end)
window_eq(w, {
{ " ", "eee", "eee" },
{ " a ", "e0e", "efe" },
{ " ", "eee", "eee" },
})
end)
end)
describe("paintutils.drawFilledBox", function()
@ -48,6 +126,31 @@ describe("The paintutils library", function()
expect.error(paintutils.drawFilledBox, 1, 1, 1, nil):eq("bad argument #4 (expected number, got nil)")
expect.error(paintutils.drawFilledBox, 1, 1, 1, 1, false):eq("bad argument #5 (expected number, got boolean)")
end)
it("draws a filled box with term colour", function()
local w = with_window(3, 3, function()
term.setBackgroundColour(colours.red)
paintutils.drawFilledBox(1, 1, 3, 3)
end)
window_eq(w, {
{ " ", "eee", "eee" },
{ " ", "eee", "eee" },
{ " ", "eee", "eee" },
})
end)
it("draws a filled box with custom colour", function()
local w = with_window(3, 3, function()
paintutils.drawFilledBox(1, 1, 3, 3, colours.red)
end)
window_eq(w, {
{ " ", "eee", "eee" },
{ " ", "eee", "eee" },
{ " ", "eee", "eee" },
})
end)
end)
describe("paintutils.drawImage", function()