120 lines
2.1 KiB
Text
120 lines
2.1 KiB
Text
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#lang scribble/manual
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@(require (for-label racket))
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@title{Gradient}
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A linear color fade between two colors@section{categories}
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GUI>Accessories
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@section{related}
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Classes/Color, Classes/HiliteGradient
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@section{description}
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@section{note}
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The use of Gradient is strong::not supported yet::. When Gradient is used in place of Color, the average gradient color will be used instead. ::
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@section{classmethods}
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@section{method}
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new
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@section{argument}
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color1
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An instance of link::Classes/Color::.
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@section{argument}
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color2
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An instance of link::Classes/Color::.
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@section{argument}
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direction
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@racketblock[\h:: or ]
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@racketblock[\v:: for horizontal and vertical respectively. Default value is ]
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@racketblock[\h::.
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]
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@section{argument}
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steps
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The resolution of the gradient. Default value is 64.
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@section{instancemethods}
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@section{method}
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at
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Retrieve the colour at position
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@racketblock[pos::, typically a value between zero and one. ]
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@racketblock[at(0):: is ]
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@racketblock[color1::, and ]
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@racketblock[at(1):: is ]
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@racketblock[color2::.
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]
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@section{argument}
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pos
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@section{examples}
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@racketblock[
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// basic usage
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(
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w = Window.new.front;
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w.view.background = Gradient(Color.yellow,Color.white);
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)
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// change direction and resolution
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(
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w = Window.new.front;
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w.view.background = Gradient(Color.red,Color.white,\v, 5);
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)
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// almost unnoticeable variations can be pleasant
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(
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w = Window.new.front;
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v = CompositeView(w, Rect(50,50,300,300));
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c = Color.rand;
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d = c.vary(0.15);
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v.background = Gradient(c, d, \v);
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[c, d].postln
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)
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(
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var w, k, c, d, e, c1, c2, f, g;
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w = Window.new.front;
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k = Slider2D(w, Rect(50,50,300,300));
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f = {
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c = Color.rand;
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d = c.vary(0.5);
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e = d.vary(0.5);
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};
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g = {
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c1 = d.hueBlend(e, k.y).round(0.01);
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c2 = c.hueBlend(e, k.x).round(0.01);
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k.background = Gradient(c1, c2, \v)
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};
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f.value; g.value;
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k.action = g;
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k.mouseUpAction = { [c1, c2].postln };
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k.keyDownAction = f; // hit any key for new color
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)
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// an example using gradient indirectly to update window colour
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(
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w=Window.new.front;
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g = Gradient(Color.red,Color.green);
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Task{
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(0, 0.01 .. 1).do{|pos|
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w.view.background = g.at(pos);
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0.01.wait;
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};
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}.play(AppClock)
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)
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::
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]
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