Color wheel: Difference between revisions
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{{out}}
Screenshot: [https://slack-files.com/T0CNUL56D-F016R0KR727-8f0ed6a40d colorwheel.png] (offsite PNG image)
=={{header|Delphi}}==
{{libheader| Winapi.Windows}}
{{libheader| System.SysUtils}}
{{libheader| Vcl.Graphics}}
{{libheader| System.Math}}
{{libheader| Vcl.Imaging.pngimage}}
{{Trans|Kotlin}}
<lang Delphi>
program Color_wheel;
{$APPTYPE CONSOLE}
uses
Winapi.Windows,
System.SysUtils,
Vcl.Graphics,
System.Math,
Vcl.Imaging.pngimage;
const
TAU = 2 * PI;
function HSBtoColor(hue, sat, bri: Double): TColor;
var
f, h: Double;
u, p, q, t: Byte;
begin
u := Trunc(bri * 255 + 0.5);
if sat = 0 then
Exit(rgb(u, u, u));
h := (hue - Floor(hue)) * 6;
f := h - Floor(h);
p := Trunc(bri * (1 - sat) * 255 + 0.5);
q := Trunc(bri * (1 - sat * f) * 255 + 0.5);
t := Trunc(bri * (1 - sat * (1 - f)) * 255 + 0.5);
case Trunc(h) of
0:
result := rgb(u, t, p);
1:
result := rgb(q, u, p);
2:
result := rgb(p, u, t);
3:
result := rgb(p, q, u);
4:
result := rgb(t, p, u);
5:
result := rgb(u, p, q);
else
result := clwhite;
end;
end;
function ColorWheel(Width, Height: Integer): TPngImage;
var
Center: TPoint;
Radius: Integer;
x, y: Integer;
Hue, dy, dx, dist, theta: Double;
Bmp: TBitmap;
begin
Bmp := TBitmap.Create;
Bmp.SetSize(Width, Height);
with Bmp.Canvas do
begin
Brush.Color := clWhite;
FillRect(ClipRect);
Center := ClipRect.CenterPoint;
Radius := Center.X;
if Center.Y < Radius then
Radius := Center.Y;
for y := 0 to Height - 1 do
begin
dy := y - Center.y;
for x := 0 to Width - 1 do
begin
dx := x - Center.x;
dist := Sqrt(Sqr(dx) + Sqr(dy));
if dist <= Radius then
begin
theta := ArcTan2(dy, dx);
Hue := (theta + PI) / TAU;
Pixels[x, y] := HSBtoColor(Hue, 1, 1);
end;
end;
end;
end;
Result := TPngImage.Create;
Result.Assign(Bmp);
Bmp.Free;
end;
begin
with ColorWheel(500, 500) do
begin
SaveToFile('ColorWheel.png');
Free;
end;
end.</lang>
{{out}}
Png Image [https://ibb.co/T0w8KyF].
=={{header|Fōrmulæ}}==
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