func drawMoon(canvas gxui.Canvas, center math.Point, radius float32) {
c := 40
p := make(gxui.Polygon, c*2)
for i := 0; i < c; i++ {
frac := float32(i) / float32(c)
α := math.Lerpf(math.Pi*1.2, math.Pi*-0.2, frac)
p[i] = gxui.PolygonVertex{
Position: math.Point{
X: center.X + int(radius*math.Sinf(α)),
Y: center.Y + int(radius*math.Cosf(α)),
},
RoundedRadius: 0,
}
}
for i := 0; i < c; i++ {
frac := float32(i) / float32(c)
α := math.Lerpf(math.Pi*-0.2, math.Pi*1.2, frac)
r := math.Lerpf(radius, radius*0.5, math.Sinf(frac*math.Pi))
p[i+c] = gxui.PolygonVertex{
Position: math.Point{
X: center.X + int(r*math.Sinf(α)),
Y: center.Y + int(r*math.Cosf(α)),
},
RoundedRadius: 0,
}
}
canvas.DrawPolygon(p, gxui.CreatePen(3, gxui.Gray80), gxui.CreateBrush(gxui.Gray40))
}
func buildMoon(theme gxui.Theme, center math.Point, radius float32) gxui.Image {
c := 40
p := make(gxui.Polygon, c*2)
for i := 0; i < c; i++ {
frac := float32(i) / float32(c)
α := math.Lerpf(math.Pi*1.2, math.Pi*-0.2, frac)
p[i] = gxui.PolygonVertex{
Position: math.Point{
X: center.X + int(radius*math.Sinf(α)),
Y: center.Y + int(radius*math.Cosf(α)),
},
RoundedRadius: 0,
}
}
for i := 0; i < c; i++ {
frac := float32(i) / float32(c)
α := math.Lerpf(math.Pi*-0.2, math.Pi*1.2, frac)
r := math.Lerpf(radius, radius*0.5, math.Sinf(frac*math.Pi))
p[i+c] = gxui.PolygonVertex{
Position: math.Point{
X: center.X + int(r*math.Sinf(α)),
Y: center.Y + int(r*math.Cosf(α)),
},
RoundedRadius: 0,
}
}
image := theme.CreateImage()
image.SetPolygon(p, gxui.CreatePen(3, gxui.Gray80), gxui.CreateBrush(gxui.Gray40))
return image
}
func depthToImage(img *image.RGBA, w int, h int, buffer []byte) {
for y := 0; y < h; y++ {
for x := 0; x < w; x++ {
bits := (uint32(buffer[3]) << 24) | (uint32(buffer[2]) << 16) | (uint32(buffer[1]) << 8) | (uint32(buffer[0]) << 0)
depth := gomath.Float32frombits(bits)
buffer = buffer[4:]
d := 0.01 / (1.0 - depth)
c := color.RGBA{
R: byte(math.Cosf(d+math.TwoPi*0.000)*127.0 + 128.0),
G: byte(math.Cosf(d+math.TwoPi*0.333)*127.0 + 128.0),
B: byte(math.Cosf(d+math.TwoPi*0.666)*127.0 + 128.0),
A: byte(0xFF),
}
img.Set(x, y, c)
}
}
}
func appMain(driver gxui.Driver) {
theme := flags.CreateTheme(driver)
font, err := driver.CreateFont(gxfont.Default, 75)
if err != nil {
panic(err)
}
window := theme.CreateWindow(380, 100, "Hi")
window.SetBackgroundBrush(gxui.CreateBrush(gxui.Gray50))
label := theme.CreateLabel()
label.SetFont(font)
label.SetText("Hello world")
window.AddChild(label)
ticker := time.NewTicker(time.Millisecond * 30)
go func() {
phase := float32(0)
for _ = range ticker.C {
c := gxui.Color{
R: 0.75 + 0.25*math.Cosf((phase+0.000)*math.TwoPi),
G: 0.75 + 0.25*math.Cosf((phase+0.333)*math.TwoPi),
B: 0.75 + 0.25*math.Cosf((phase+0.666)*math.TwoPi),
A: 0.50 + 0.50*math.Cosf(phase*10),
}
phase += 0.01
driver.Call(func() {
label.SetColor(c)
})
}
}()
window.OnClose(ticker.Stop)
window.OnClose(driver.Terminate)
}
func drawStar(canvas gxui.Canvas, center math.Point, radius, rotation float32, points int) {
p := make(gxui.Polygon, points*2)
for i := 0; i < points*2; i++ {
frac := float32(i) / float32(points*2)
α := frac*math.TwoPi + rotation
r := []float32{radius, radius / 2}[i&1]
p[i] = gxui.PolygonVertex{
Position: math.Point{
X: center.X + int(r*math.Cosf(α)),
Y: center.Y + int(r*math.Sinf(α)),
},
RoundedRadius: []float32{0, 50}[i&1],
}
}
canvas.DrawPolygon(p, gxui.CreatePen(3, gxui.Red), gxui.CreateBrush(gxui.Yellow))
}
func buildStar(theme gxui.Theme, center math.Point, radius, rotation float32, points int) gxui.Image {
p := make(gxui.Polygon, points*2)
for i := 0; i < points*2; i++ {
frac := float32(i) / float32(points*2)
α := frac*math.TwoPi + rotation
r := []float32{radius, radius / 2}[i&1]
p[i] = gxui.PolygonVertex{
Position: math.Point{
X: center.X + int(r*math.Cosf(α)),
Y: center.Y + int(r*math.Sinf(α)),
},
RoundedRadius: []float32{0, 50}[i&1],
}
}
image := theme.CreateImage()
image.SetPolygon(p, gxui.CreatePen(3, gxui.Red), gxui.CreateBrush(gxui.Yellow))
return image
}
func segment(penWidth, r float32, a, b, c math.Vec2, aIsLast bool, vsEdgePos []float32, fillEdge []math.Vec2) ([]float32, []math.Vec2) {
ba, ca := a.Sub(b), a.Sub(c)
baLen, caLen := ba.Len(), ca.Len()
baDir, caDir := ba.DivS(baLen), ca.DivS(caLen)
dp := baDir.Dot(caDir)
if dp < -0.99999 {
// Straight lines cause DBZs, special case
inner := a.Sub(caDir.Tangent().MulS(penWidth))
vsEdgePos = appendVec2(vsEdgePos, a, inner)
if fillEdge != nil /*&& i != 0*/ {
fillEdge = append(fillEdge, inner)
}
return vsEdgePos, fillEdge
}
α := math.Acosf(dp) / 2
// ╔═══════════════════════════╦════════════════╗
// ║ ║ ║
// ║ A ║ ║
// ║ ╱:╲ ║ ║
// ║ ╱α:α╲ ║ A ║
// ║ ╱ : ╲ ║ |╲ ║
// ║ ╱ . d . ╲ ║ |α╲ ║
// ║ . : . ║ | ╲ ║
// ║ .P : Q. ║ | ╲ ║
// ║ ╱ X ╲ ║ | ╲ ║
// ║ ╱ . ┊ . ╲ ║ | ╲ ║
// ║ ╱ . r . ╲ ║ | ╲ ║
// ║ ╱ . ┊ . ╲ ║ |┐ β╲ ║
// ║ B ┊ C ║ P————————X ║
// ║ ║ ║
// ║ ^ ║ ║
// ║ ┊v ║ ║
// ║ ┊ u ║ ║
// ║ ┊—————> ║ ║
// ║ ║ ║
// ╚═══════════════════════════╩════════════════╝
v := baDir.Add(caDir).Normalize()
u := v.Tangent()
//
// cos(2 • α) = dp
//
// cos⁻¹(dp)
// α = ───────────
// 2
//
// r
// sin(α) = ───
// d
//
// r
// d = ──────
// sin(α)
//
d := r / math.Sinf(α)
// X cannot be futher than half way along ab or ac
dMax := math.Minf(baLen, caLen) / (2 * math.Cosf(α))
if d > dMax {
// Adjust d and r to compensate
d = dMax
r = d * math.Sinf(α)
}
x := a.Sub(v.MulS(d))
convex := baDir.Tangent().Dot(caDir) <= 0
w := penWidth
β := math.Pi/2 - α
// Special case for convex vertices where the pen width is greater than
// the rounding. Without dealing with this, we'd end up with the inner
// vertices overlapping. Instead use a point calculated much the same as
// x, but using the pen width.
useFixedInnerPoint := convex && w > r
fixedInnerPoint := a.Sub(v.MulS(math.Minf(w/math.Sinf(α), dMax)))
// Concave vertices behave much the same as convex, but we have to flip
// β as the sweep is reversed and w as we're extruding.
if !convex {
w, β = -w, -β
}
steps := 1 + int(d*α)
if aIsLast {
// No curvy edge required for the last vertex.
// This is already done by the first vertex.
steps = 1
}
for j := 0; j < steps; j++ {
γ := float32(0)
if steps > 1 {
γ = math.Lerpf(-β, β, float32(j)/float32(steps-1))
}
dir := v.MulS(math.Cosf(γ)).Add(u.MulS(math.Sinf(γ)))
va := x.Add(dir.MulS(r))
vb := va.Sub(dir.MulS(w))
if useFixedInnerPoint {
vb = fixedInnerPoint
}
vsEdgePos = appendVec2(vsEdgePos, va, vb)
if fillEdge != nil {
fillEdge = append(fillEdge, vb)
}
}
return vsEdgePos, fillEdge
}
func appMain(driver gxui.Driver) {
theme := flags.CreateTheme(driver)
font, err := driver.CreateFont(gxfont.Default, 75)
if err != nil {
panic(err)
}
window := theme.CreateWindow(800, 480, "Привет")
window.SetBackgroundBrush(gxui.CreateBrush(gxui.Gray50))
window.SetBorderPen(gxui.Pen{Width: 5, Color: gxui.Yellow})
f, err := os.Open("wallpaper.jpg")
if err != nil {
fmt.Printf("Failed to open image %v\n", err)
os.Exit(1)
}
source, _, err := image.Decode(f)
if err != nil {
fmt.Printf("Failed to open image %v\n", err)
os.Exit(2)
}
wallpaper := theme.CreateImage()
window.AddChild(wallpaper)
// Copy the image to a RGBA format before handing to a gxui.Texture
rgba := image.NewRGBA(source.Bounds())
draw.Draw(rgba, source.Bounds(), source, image.ZP, draw.Src)
texture := driver.CreateTexture(rgba, 1)
wallpaper.SetTexture(texture)
layout := theme.CreateLinearLayout()
layout.SetDirection(gxui.TopToBottom)
window.AddChild(layout)
label := theme.CreateLabel()
label.SetFont(font)
label.SetText("Здравствуй мир")
label.OnMouseMove(func(e gxui.MouseEvent) {
fmt.Printf("X=%d; Y=%d\n", e.Point.X, e.Point.Y)
})
layout.AddChild(label)
lTimer := theme.CreateLabel()
lTimer.SetFont(font)
lTimer.SetColor(gxui.Green30)
layout.AddChild(lTimer)
button := theme.CreateButton()
button.SetText("Exit")
button.SetPadding(math.Spacing{20, 10, 20, 10})
button.SetMargin(math.Spacing{20, 10, 20, 10})
button.OnClick(func(e gxui.MouseEvent) {
window.Close()
})
layout.AddChild(button)
ticker := time.NewTicker(time.Millisecond * 30)
go func() {
phase := float32(0)
for _ = range ticker.C {
c := gxui.Color{
R: 0.75 + 0.25*math.Cosf((phase+0.000)*math.TwoPi),
G: 0.75 + 0.25*math.Cosf((phase+0.333)*math.TwoPi),
B: 0.75 + 0.25*math.Cosf((phase+0.666)*math.TwoPi),
A: 0.50 + 0.50*math.Cosf(phase*10),
}
phase += 0.01
driver.Call(func() {
label.SetColor(c)
})
}
}()
ticker2 := time.NewTicker(time.Millisecond * 100)
go func() {
for t := range ticker.C {
driver.Call(func() {
lTimer.SetText(t.Format(time.Stamp))
})
}
}()
window.OnClose(ticker.Stop)
window.OnClose(ticker2.Stop)
window.OnClose(driver.Terminate)
}