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gui_demo.rhm
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gui_demo.rhm
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#lang rhombus/static
import:
draw
gui
// ----------------------------------------
fun draw_face(dc :: draw.DC, config :: Map):
let draw.Size(w, h) = dc.size
let s = math.max(10, math.min(w, h) - 20)
let scale = config["scale"] / 50
let w = w / scale
let h = h / scale
let x = (w-s)/2
let y = (h-s)/2
let π = math.pi
dc.save_and_restore:
dc.scale(scale)
let background:
match config["mood"]
| "Happy":
let center = [w/2, h/2]
draw.RadialGradient([center, s/2],
[center, math.max(w, h)],
[[0, draw.Color("white")],
[1, draw.Color("yellow")]])
| "Sad":
draw.LinearGradient([0, 0],
[0, h],
[[0.5, draw.Color("white")],
[1, draw.Color("darkblue")]])
// draw a gradient backround
dc.pen := draw.Pen.none
dc.brush := draw.Brush(~gradient: background)
dc.rectangle([0, 0, w, h])
// draw keyed text
dc.font := dc.font with (size = dc.font.size * 2)
dc.text(config["keyed"])
// draw ghost dots (showing recent mouse movements)
let dot_size = [4, 4]
for values(brush :~ draw.Brush:
draw.Brush(~color: draw.Color(0, 0, 0, 0.25))):
each [x, y]: (config["ghosts"] :: List).reverse()
dc.brush := brush
let x = x/scale
let y = y/scale
dc.ellipse([[x-2, y-2], dot_size])
brush with (color = brush.color with (alpha = brush.color.alpha * 0.7))
// face shape
dc.brush := draw.Brush(~color: "orange")
let face_rect = [x, y, s, s]
match config["shape"]
| "Circle": dc.ellipse(face_rect)
| "Square": dc.rectangle(face_rect)
| "Rounded": dc.rounded_rectangle(face_rect)
// mouth
dc.pen := draw.Pen(~color: "Black")
dc.brush := draw.Brush.none
match config["mood"]
| "Happy":
dc.arc([x + 0.2*s, y + 0.2*s, 0.6*s, 0.6*s], π * -3/4, π * -1/4)
| "Sad":
dc.arc([x + 0.2*s, y + 0.7*s, 0.6*s, 0.6*s], π * 1/4, π * 3/4)
// eyes
when config["eyes"]
| dc.pen := draw.Pen.none
dc.brush := draw.Brush(~color: "black")
let eye_size = [0.1*s, 0.1*s]
dc.ellipse([[x+0.3*s, y+0.3*s], eye_size])
dc.ellipse([[x+0.6*s, y+0.3*s], eye_size])
// moustache
when config["moustache"]
| let p = draw.Path()
p.move_to([0, 0])
p.curve_to([20, -10], [80, -10], [100, 0])
p.curve_to([120, 10], [180, 0], [200, -20])
p.curve_to([180, 20], [120, 40], [90, 30])
p.curve_to([60, 20], [20, 20], [0, 0])
p.close()
p.scale(s/500, s/500)
dc.pen := draw.Pen.none
dc.brush := draw.Brush(~color: "brown")
dc.path(p, ~dx: x+0.5*s, ~dy: y+0.6*s)
p.scale(-1, 1)
dc.path(p, ~dx: x+0.5*s, ~dy: y+0.6*s)
// ----------------------------------------
def tabs:
let at_tab = gui.Obs("Happy")
let shape = gui.Choice(["Circle", "Square", "Rounded"],
~selection: "Circle")
let eyes = gui.Checkbox("Eyes", ~is_checked: #true)
let stache = gui.Checkbox("Moustache", ~is_checked: #false)
let scale = gui.Slider(~value: 50,
~min_value: 1,
~max_value: 100,
// Could write `gui.Slider.Style.plain`,
// etc., but we write symbols for convenience:
~styles: [#'plain, #'horizontal])
let spacer = gui.Spacer()
let ghosts = gui.Obs([])
fun ghost_mouse(ev :: gui.MouseEvent, area):
ghosts.update(fun (l :: List):
let keep :~ List:
if l.length() < 10 | l | l.rest
keep ++ [[ev.x, ev.y]])
let keyed = gui.Obs("")
fun accum_key(ev :: gui.KeyEvent, area):
keyed.update(fun (s :: String):
match ev.code
| #{#\backspace} || #{#\rubout}:
if s.length() == 0 | s | s.substring(0, s.length() - 1)
| c :: Char: s ++ to_string(c)
| ~else: s)
let canvas = gui.VPanel({ "mood": at_tab,
"shape": shape.at_selection,
"eyes": eyes.at_is_checked,
"moustache": stache.at_is_checked,
"scale": scale.at_value,
"ghosts": ghosts,
"keyed": keyed }
|> gui.Obs.combine(_)
|> gui.Canvas(_,
draw_face,
~mouse: ghost_mouse,
~key: accum_key),
gui.HPanel(shape, eyes, stache,
spacer,
gui.Label("-"), scale, gui.Label("+"),
~stretch: [#true, #false]))
let happy_button = gui.Button("Be Happy",
~action: fun ():
at_tab.update(fun (v): "Happy"),
~stretch: [#false, #false])
gui.TabsPanel(["Happy", "Sad"],
~selection: at_tab,
at_tab.map((match _
| "Happy": canvas
| "Sad": gui.HPanel(canvas, happy_button)
)))
// ----------------------------------------
tabs
|> gui.Window(_,
~size: [800, 600])
|> gui.render(_)