Replace MOTD lines with useful ones.

Add 2 new fun programs and improve Mandelbrot plotter

Capy64/Assets/Lua/CapyOS/sys/bin/fun/donuts.lua

@@ -0,0 +1,40 @@
+local gpu = require("gpu")
+local event = require("event")
+local donuts = {}
+local limit = 100
+
+local w, h = gpu.getSize()
+local function insert()
+    local donut = {
+        x = math.random(-20, w + 20),
+        y = math.random(-20, h + 20),
+        d = math.random() * math.pi*2,
+        dir = math.random(0, 1),
+        c = math.random(0xffffff),
+        life = math.random(100, 1000),
+    }
+    table.insert(donuts, donut)
+end
+
+while true do
+    if #donuts < limit then
+        insert()
+    end
+    gpu.clear(0)
+    for k, donut in ipairs(donuts) do
+        if donut.life <= 0 then
+            table.remove(donuts, k)
+        end
+        local doReverse = math.random(0, 1000) > 950
+        donut.x = donut.x + math.cos(donut.d) * 4
+        donut.y = donut.y + math.sin(donut.d) * 4
+        donut.d = donut.d + (donut.dir == 1 and 0.05 or -0.05)
+        gpu.drawCircle(donut.x, donut.y, 20, donut.c, 10)
+        if doReverse then
+            donut.dir = donut.dir == 1 and 0 or 1
+        end
+        donut.life = donut.life - 1
+    end
+    event.push("donuts")
+    event.pull("donuts")
+end

Capy64/Assets/Lua/CapyOS/sys/bin/fun/mandelbrot.lua

@@ -38,15 +38,19 @@ local function iter(cr, ci)
 end
 
 local function draw()
-    local buffer <close> = gpu.newBuffer()
+    local size = w * h
+    local canvas = { string.unpack(("B"):rep(size), ("\0"):rep(size)) }
+    canvas[#canvas] = nil
+
 
     for y = 0, h - 1 do
         for x = 0, w - 1 do
             local _, _, i = iter((x - cx + dx * pscale) * px, (y - cy + dy * pscale) * px)
-            buffer[y * w + x] = colorUnit * (iterations - i)
+            canvas[y * w + x] = colorUnit * (iterations - i)
         end
     end
 
+    local buffer <close> = gpu.bufferFrom(canvas, w, h)
     gpu.setBuffer(buffer)
 end
 

Capy64/Assets/Lua/CapyOS/sys/bin/fun/paint.lua

@@ -0,0 +1,209 @@
+local event = require("event")
+local gpu = require("gpu")
+local colors = require("colors")
+local term = require("term")
+local timer = require("timer")
+
+local w, h = gpu.getSize()
+local tw, th = term.getSize()
+
+local selectedColor = 1
+local thickness = 4
+
+local canvasW, canvasH = term.toRealPos(tw - 1, th + 1)
+canvasW = canvasW - 3
+local size = canvasW * canvasH
+local canvas = {string.unpack(("B"):rep(size), ("\0"):rep(size))}
+canvas[#canvas] = nil
+
+local function drawCircle(buffer, x, y, radius, color)
+    radius = math.max(0, radius)
+    if radius == 0 then
+        buffer[x + buffer.width * y] = color
+        return
+    end
+    local width = buffer.width
+    local height = buffer.height
+
+    local index = function(x, y)
+        return y * width + x
+    end
+
+    local isValid = function(x, y)
+        return x >= 0 and x < width and y >= 0 and y < height
+    end
+
+    local setPixel = function(x, y, color)
+        if isValid(x, y) then
+            buffer[index(x, y)] = color
+        end
+    end
+
+    local drawFilledCirclePoints = function(cx, cy, x, y)
+        for dx = -x, x do
+            for dy = -y, y do
+                setPixel(cx + dx, cy + dy, color)
+            end
+        end
+    end
+
+    local drawCircleBresenham = function(cx, cy, radius)
+        local x = 0
+        local y = radius
+        local d = 3 - 2 * radius
+        drawFilledCirclePoints(cx, cy, x, y)
+        while y >= x do
+            x = x + 1
+            if d > 0 then
+                y = y - 1
+                d = d + 4 * (x - y) + 10
+            else
+                d = d + 4 * x + 6
+            end
+            drawFilledCirclePoints(cx, cy, x, y)
+        end
+    end
+
+    drawCircleBresenham(x, y, radius)
+end
+
+local function drawLine(buffer, x0, y0, x1, y1, color, thickness)
+    local width = canvasW
+    local height = canvasH
+
+    local index = function(x, y)
+        return y * width + x
+    end
+
+    local isValid = function(x, y)
+        return x >= 0 and x < width and y >= 0 and y < height
+    end
+
+    local setPixel = function(x, y)
+        if isValid(x, y) then
+            buffer[index(x, y)] = color
+        end
+    end
+
+    local drawLineBresenham = function()
+        local i = 0
+        local dx = math.abs(x1 - x0)
+        local dy = math.abs(y1 - y0)
+        local sx = x0 < x1 and 1 or -1
+        local sy = y0 < y1 and 1 or -1
+        local err = dx - dy
+
+        local majorAxis = dx > dy
+
+        while x0 ~= x1 or y0 ~= y1 do
+            for i = 0, thickness - 1 do
+                if majorAxis then
+                    setPixel(x0, y0 + i)
+                else
+                    setPixel(x0 + i, y0)
+                end
+            end
+
+            local err2 = 2 * err
+            if err2 > -dy then
+                err = err - dy
+                x0 = x0 + sx
+            end
+            if err2 < dx then
+                err = err + dx
+                y0 = y0 + sy
+            end
+
+            if i % 1024 == 0 then
+                --event.push("paint")
+                --event.pull("paint")
+                --timer.sleep(0)
+            end
+        end
+    end
+    drawLineBresenham()
+end
+
+local function drawUI()
+    term.setBackground(0)
+    term.clear()
+    for y = 1, 16 do
+        term.setPos(tw - 1, y)
+        term.setBackground(0)
+        term.setForeground(colors[y])
+        if selectedColor == y then
+            term.setBackground(colors[y])
+            term.write("  ")
+        else
+            term.write("##")
+        end
+    end
+    term.setPos(tw - 1, 17)
+
+    if selectedColor == 0 then
+        term.setBackground(colors.white)
+        term.setForeground(0)
+    else
+        term.setBackground(0)
+        term.setForeground(colors.white)
+    end
+    term.write("XX")
+
+    term.setPos(tw - 1, 18)
+    term.setBackground(colors.black)
+    term.setForeground(colors.white)
+    term.write(thickness)
+
+    gpu.drawLine(canvasW + 1, 0, canvasW, canvasH, colors.gray, 2)
+
+    local b<close> = gpu.bufferFrom(canvas, canvasW, canvasH)
+    gpu.drawBuffer(b, 0, 0, {
+        source = {
+            0, 0, canvasW, canvasH
+        }
+    })
+end
+
+local function contains(arr, val)
+    for i, v in ipairs(arr) do
+        if v == val then
+            return true
+        end
+    end
+    return false
+end
+
+local oldX, oldY
+while true do
+    drawUI()
+
+    local ev, b, x, y = event.pull("mouse_down", "mouse_up", "mouse_move", "mouse_scroll")
+    local tx, ty = term.fromRealPos(x, y)
+    if ev == "mouse_up" then
+        if x >= canvasW then
+            if ty <= 16 then
+                selectedColor = ty
+            elseif ty == 17 then
+                selectedColor = 0
+            end
+        end
+        oldX, oldY = nil, nil
+    elseif ev == "mouse_down" or (ev == "mouse_move" and contains(b, 1)) then
+        if x < canvasW and y < canvasH then
+            --canvas[x + y * canvasW] = colors[selectedColor] or 0
+            --drawCircle(canvas, x, y, thickness - 2, colors[selectedColor])
+
+            drawLine(canvas, x, y, oldX or x, oldY or y, colors[selectedColor] or 0, thickness)
+            --gpu.drawLine(x, y, oldX or x, oldY or y, colors[selectedColor] or 0)
+            --canvas = gpu.getBuffer()
+
+            oldX, oldY = x, y
+        end
+    elseif ev == "mouse_scroll" then
+        local x, y, b = b, x, y
+        local tx, ty = term.fromRealPos(x, y)
+        if x >= canvasW and ty == 18 then
+            thickness = math.min(99, math.max(0, thickness - b))
+        end
+    end
+end

Capy64/Assets/Lua/CapyOS/sys/share/motd.txt

@@ -1,8 +1,3 @@
-Please do not use this software to flash firmwares.
-Now with bitwise operators!
-Writing to _G is a war crime.
-Tampering with _G in any way is also a war crime.
-No, Wojbie, stop! STOP TOUCHING _G!
-Stop! You've violated the law!
-That's 65% more bullet per bullet.
-This software is not responsible for collapses of spacetime.
+You can get started with Lua by following this manual: https://www.lua.org/manual/
+Learn more about Capy64 by following the documentation: https://capy64.alexdevs.me/
+Found a bug or would like to suggest a feature? https://github.com/Ale32bit/Capy64/issues