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simulator.go
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simulator.go
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//go:build !baremetal
package board
// The simulator for a generic board. It can simulate various kinds of hardware,
// like:
// * event badges
// * GameBoy-like handhelds (Game Boy Advance, PyBadge)
// * smartwatches
// * boards with only a touchscreen (PyPortal).
// It is currently mostly made for boards with a display, but this is not at all
// a requirement in the API.
//
// The board API doesn't use a mainloop of any kind, which would not be
// necessary anyway on embedded systems. But it is necessary on OSes, so to work
// around this the simulator is actually run in a separate process by starting
// the current process again and communicating over pipes (stdin/stdout in the
// simulator process).
import (
"bufio"
"fmt"
"image"
"image/color"
"io"
"math/rand"
"os"
"strconv"
"strings"
"sync"
"fyne.io/fyne/v2"
"fyne.io/fyne/v2/app"
"fyne.io/fyne/v2/canvas"
"fyne.io/fyne/v2/container"
"fyne.io/fyne/v2/driver/desktop"
"fyne.io/fyne/v2/layout"
"fyne.io/fyne/v2/widget"
"golang.org/x/image/draw"
)
const runWindowCommand = "run-simulator-window"
func init() {
if len(os.Args) >= 2 && os.Args[1] == runWindowCommand {
// This is the simulator process.
// Run the entire window in an init function, because that's the only
// way to do this with the API that is exposed by the board package.
windowMain()
os.Exit(0)
}
}
var (
displayImageLock sync.Mutex
displayImage *image.RGBA
displayScrollTopFixed int
displayScrollBottomFixed int
displayScrollLine int
displayMaxBrightness = 1
displayBrightness = 0
ledsLock sync.Mutex
leds []color.RGBA
ledsPerRow = 6
)
// The main function for the window process.
func windowMain() {
// Create a raster image to use as a display buffer.
displayImage = image.NewRGBA(image.Rect(0, 0, 240, 240))
display := &displayWidget{}
display.Generator = func(w, h int) image.Image {
displayImageLock.Lock()
defer displayImageLock.Unlock()
img := image.NewRGBA(image.Rect(0, 0, w, h))
draw.Draw(img, image.Rect(0, 0, w, h), image.NewUniform(color.RGBA{
R: 192,
G: 192,
B: 192,
A: 255,
}), image.Pt(0, 0), draw.Over)
rect := displayImage.Bounds()
scale := h / rect.Dy()
width := rect.Dx() * scale
height := rect.Dy() * scale
x := (w - width) / 2
y := (h - height) / 2
displayRect := image.Rect(x, y, x+width, y+height)
if displayBrightness <= 0 {
// The backlight is off, so indicate this by making the screen gray.
draw.Draw(img, displayRect, image.NewUniform(color.RGBA{
R: 96,
G: 96,
B: 96,
A: 255,
}), image.Pt(0, 0), draw.Src)
} else {
// Draw the display as usual.
scrolledImage := displayImage
if displayScrollLine != 0 {
// Hardware scrolling is in use, so scroll the middle part of
// the screen.
scrolledImage = image.NewRGBA(displayImage.Rect)
topH := displayScrollTopFixed
bottomH := displayScrollBottomFixed
childH := rect.Dy() - topH - bottomH
rotated := displayScrollLine - topH
rotatedUpH := childH - rotated
rotatedDownH := childH - rotatedUpH
draw.Copy(scrolledImage, image.Pt(0, 0), displayImage, image.Rect(0, 0, rect.Dx(), topH), draw.Over, nil) // top fixed area
draw.Copy(scrolledImage, image.Pt(0, topH), displayImage, image.Rect(0, topH+rotatedDownH, rect.Dx(), topH+childH), draw.Over, nil) // rotated up part
draw.Copy(scrolledImage, image.Pt(0, topH+rotatedUpH), displayImage, image.Rect(0, topH, rect.Dx(), topH+rotatedDownH), draw.Over, nil) // rotated down part
draw.Copy(scrolledImage, image.Pt(0, rect.Dy()-bottomH), displayImage, image.Rect(0, rect.Dy()-bottomH, rect.Dx(), bottomH), draw.Over, nil) // bottom fixed area
}
draw.NearestNeighbor.Scale(img, displayRect, scrolledImage, scrolledImage.Bounds(), draw.Src, nil)
}
return img
}
// Create LEDs.
ledsWidget := canvas.NewRaster(func(w, h int) image.Image {
ledsLock.Lock()
defer ledsLock.Unlock()
img := image.NewRGBA(image.Rect(0, 0, w, h))
// Draw all the LEDs as squares, each 24 pixels in size with an 8 pixel
// gap.
rows := (len(leds) + ledsPerRow - 1) / ledsPerRow
scale := float64(h) / float64(rows*32)
col := 0
row := 0
for _, c := range leds {
x0 := int(float64(8+col*32) * scale)
x1 := int(float64(8+col*32+24) * scale)
y0 := int(float64(row*32) * scale)
y1 := int(float64(row*32+24) * scale)
area := image.Rect(x0, y0, x1, y1)
draw.Draw(img, area, image.NewUniform(c), image.Pt(0, 0), draw.Src)
col++
if col >= ledsPerRow {
col = 0
row++
}
}
return img
})
ledsWidget.Hidden = true
// X/Y/Z acceleration.
// Simulate the device in an upright position (like how you'd hold a phone
// when making a photo in portrait mode).
var accelX, accelY, accelZ = 0.0, 1.0, 0.0
accelContainer := container.New(layout.NewHBoxLayout(),
widget.NewLabel(strconv.FormatFloat(accelX, 'f', 2, 64)),
widget.NewLabel(strconv.FormatFloat(accelY, 'f', 2, 64)),
widget.NewLabel(strconv.FormatFloat(accelZ, 'f', 2, 64)))
fmt.Printf("accel %f %f %f\n", accelX, accelY, accelZ)
// Step count.
var stepCount uint32
stepCountWidget := widget.NewLabel("0")
stepCountIncrementButton := widget.NewButton("+", func() {
stepCount++
stepCountWidget.SetText(strconv.FormatUint(uint64(stepCount), 10))
fmt.Printf("steps %d\n", stepCount)
})
stepCountContainer := container.New(layout.NewHBoxLayout(), stepCountWidget, layout.NewSpacer(), stepCountIncrementButton)
paramGrid := container.New(layout.NewGridLayout(2),
widget.NewLabel("Accel X/Y/Z:"), accelContainer,
widget.NewLabel("Steps:"), stepCountContainer)
// Create a window.
a := app.New()
w := a.NewWindow("Simulator")
w.SetPadded(false)
w.SetFixedSize(true)
w.SetContent(fyne.NewContainerWithLayout(layout.NewVBoxLayout(), display, ledsWidget, paramGrid))
// Listen for keyboard events, and translate them to board API keycodes.
if deskCanvas, ok := w.Canvas().(desktop.Canvas); ok {
deskCanvas.SetOnKeyDown(func(event *fyne.KeyEvent) {
key := decodeFyneKey(event.Name)
if key != NoKey {
fmt.Printf("keypress %d\n", key)
}
})
deskCanvas.SetOnKeyUp(func(event *fyne.KeyEvent) {
key := decodeFyneKey(event.Name)
if key != NoKey {
fmt.Printf("keyrelease %d\n", key)
}
})
}
// Listen for events from the parent process (which includes display data).
go windowReceiveEvents(w, display, ledsWidget)
// Show the window.
w.ShowAndRun()
}
// Goroutine that listens for commands from the parent process.
func windowReceiveEvents(w fyne.Window, display *displayWidget, ledsWidget *canvas.Raster) {
r := bufio.NewReader(os.Stdin)
for {
line, err := r.ReadString('\n')
if err != nil {
if err != io.EOF {
fmt.Fprintln(os.Stderr, "unexpected error:", err)
os.Exit(1)
}
os.Exit(0)
}
cmd := strings.Fields(line)[0]
switch cmd {
case "display":
var width, height int
fmt.Sscanf(line, "%s %d %d\n", &cmd, &width, &height)
newImage := image.NewRGBA(image.Rect(0, 0, width, height))
for y := 0; y < height; y++ {
for x := 0; x < width; x++ {
r := rand.Uint32()
newImage.SetRGBA(x, y, color.RGBA{
R: uint8(r >> 0),
G: uint8(r >> 8),
B: uint8(r >> 16),
A: 255,
})
}
}
displayImageLock.Lock()
displayImage = newImage
display.SetMinSize(fyne.NewSize(float32(width), float32(height)))
displayImageLock.Unlock()
case "display-brightness":
displayImageLock.Lock()
fmt.Sscanf(line, "%s %d %d\n", &cmd, &displayBrightness, displayMaxBrightness)
displayImageLock.Unlock()
display.Refresh()
case "title":
w.SetTitle(strings.TrimSpace(line[len("title"):]))
case "draw":
// Read the image data (which is a single line).
var startX, startY, width int
fmt.Sscanf(line, "%s %d %d %d\n", &cmd, &startX, &startY, &width)
buf := make([]byte, width*3)
io.ReadFull(r, buf)
// Draw the image data to the image buffer.
displayImageLock.Lock()
for x := 0; x < width; x++ {
displayImage.SetRGBA(startX+x, startY, color.RGBA{
R: buf[x*3+0],
G: buf[x*3+1],
B: buf[x*3+2],
A: 255,
})
}
displayImageLock.Unlock()
display.Refresh()
case "scroll-start":
displayImageLock.Lock()
fmt.Sscanf(line, "%s %d %d\n", &cmd, &displayScrollTopFixed, &displayScrollBottomFixed)
displayImageLock.Unlock()
display.Refresh()
case "scroll":
displayImageLock.Lock()
fmt.Sscanf(line, "%s %d\n", &cmd, &displayScrollLine)
displayImageLock.Unlock()
display.Refresh()
case "scroll-stop":
displayImageLock.Lock()
displayScrollLine = 0
displayScrollTopFixed = 0
displayScrollBottomFixed = 0
displayImageLock.Unlock()
display.Refresh()
case "addressable-leds":
// Read the LED data.
var numLEDs int
fmt.Sscanf(line, "%s %d\n", &cmd, &numLEDs)
buf := make([]byte, numLEDs*3)
io.ReadFull(r, buf)
// Update the leds slice.
ledsLock.Lock()
if len(leds) != numLEDs {
// LEDs were configured for the first time (probably).
// Make sure we prepare for the given number of LEDs.
leds = make([]color.RGBA, numLEDs)
cols := ledsPerRow
if cols > len(leds) {
cols = len(leds)
}
rows := (len(leds) + ledsPerRow - 1) / ledsPerRow
ledsWidget.SetMinSize(fyne.NewSize(float32(cols*32+8), float32(rows*32)))
ledsWidget.Show()
}
for i := range leds {
leds[len(leds)-i-1] = color.RGBA{
R: gammaEncodeTable[buf[i*3+0]],
G: gammaEncodeTable[buf[i*3+1]],
B: gammaEncodeTable[buf[i*3+2]],
A: 255,
}
}
ledsLock.Unlock()
ledsWidget.Refresh()
default:
fmt.Fprintln(os.Stderr, "unknown command:", cmd)
}
}
}
func decodeFyneKey(key fyne.KeyName) KeyEvent {
var e KeyEvent
switch key {
case fyne.KeyLeft:
e = KeyLeft
case fyne.KeyRight:
e = KeyRight
case fyne.KeyUp:
e = KeyUp
case fyne.KeyDown:
e = KeyDown
case fyne.KeyEscape:
e = KeyEscape
case fyne.KeyReturn:
e = KeyEnter
case fyne.KeySpace:
e = KeySpace
case fyne.KeyA:
e = KeyA
case fyne.KeyB:
e = KeyB
default:
return NoKeyEvent
}
return e
}
var _ desktop.Mouseable = (*displayWidget)(nil)
var _ fyne.Draggable = (*displayWidget)(nil)
// Wrapper for canvas.Render that sends mouse events to the parent process.
type displayWidget struct {
canvas.Raster
}
func (r *displayWidget) CreateRenderer() fyne.WidgetRenderer {
return widget.NewSimpleRenderer(&r.Raster)
}
func (r *displayWidget) MouseDown(event *desktop.MouseEvent) {
if event.Button == desktop.MouseButtonPrimary {
fmt.Printf("mousedown %d %d\n", int(event.Position.X), int(event.Position.Y))
}
}
func (r *displayWidget) MouseUp(event *desktop.MouseEvent) {
if event.Button == desktop.MouseButtonPrimary {
fmt.Printf("mouseup\n")
}
}
func (r *displayWidget) Dragged(event *fyne.DragEvent) {
fmt.Printf("mousemove %d %d\n", int(event.PointEvent.Position.X), int(event.PointEvent.Position.Y))
}
func (r *displayWidget) DragEnd() {
// handled in MouseUp
}
// Gamma brightness lookup table:
// https://victornpb.github.io/gamma-table-generator
// gamma = 0.45 steps = 256 range = 0-255
var gammaEncodeTable = [256]uint8{
0, 21, 28, 34, 39, 43, 46, 50, 53, 56, 59, 61, 64, 66, 68, 70,
72, 74, 76, 78, 80, 82, 84, 85, 87, 89, 90, 92, 93, 95, 96, 98,
99, 101, 102, 103, 105, 106, 107, 109, 110, 111, 112, 114, 115, 116, 117, 118,
119, 120, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
136, 137, 138, 139, 140, 141, 142, 143, 144, 144, 145, 146, 147, 148, 149, 150,
151, 151, 152, 153, 154, 155, 156, 156, 157, 158, 159, 160, 160, 161, 162, 163,
164, 164, 165, 166, 167, 167, 168, 169, 170, 170, 171, 172, 173, 173, 174, 175,
175, 176, 177, 178, 178, 179, 180, 180, 181, 182, 182, 183, 184, 184, 185, 186,
186, 187, 188, 188, 189, 190, 190, 191, 192, 192, 193, 194, 194, 195, 195, 196,
197, 197, 198, 199, 199, 200, 200, 201, 202, 202, 203, 203, 204, 205, 205, 206,
206, 207, 207, 208, 209, 209, 210, 210, 211, 212, 212, 213, 213, 214, 214, 215,
215, 216, 217, 217, 218, 218, 219, 219, 220, 220, 221, 221, 222, 223, 223, 224,
224, 225, 225, 226, 226, 227, 227, 228, 228, 229, 229, 230, 230, 231, 231, 232,
232, 233, 233, 234, 234, 235, 235, 236, 236, 237, 237, 238, 238, 239, 239, 240,
240, 241, 241, 242, 242, 243, 243, 244, 244, 245, 245, 246, 246, 247, 247, 248,
248, 249, 249, 249, 250, 250, 251, 251, 252, 252, 253, 253, 254, 254, 255, 255,
}