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radial_gradient.cr
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radial_gradient.cr
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require "gobject/gtk/autorun"
require "../src/cairo"
class CairoApp
@window : Gtk::Window
delegate show_all, to: @window
def initialize
@window = Gtk::Window.new
@window.title = "Radial gradient"
@window.resize 250,150
@window.connect "destroy", &->Gtk.main_quit
darea = Gtk::DrawingArea.new
darea.connect "draw",&->drawfun
@window.add darea
end
def draw_gradient1(cr : Cairo::Context)
cr.set_source_rgba(0, 0, 0, 1)
cr.line_width= 12
cr.translate(60, 60)
r1 = Cairo::Pattern.create_radial(30, 30, 10, 30, 30, 90)
r1.add_color_stop(0, 1, 1, 1, 1);
r1.add_color_stop(1, 0.6, 0.6, 0.6, 1)
cr.source= r1
cr.arc(0, 0, 40, 0, 6.283)
cr.fill
end
def draw_gradient2(cr : Cairo::Context)
cr.translate(120, 0)
r2 = Cairo::Pattern.create_radial(0, 0, 10, 0, 0, 40)
r2.add_color_stop(0, 1, 1, 0);
r2.add_color_stop(1, 0.8, 0, 0, 0)
cr.source= r2
cr.arc(0, 0, 40, 0, 6.283)
cr.fill
end
def drawfun
context = Gdk.cairo_create(@window.window.not_nil!)
draw_gradient1(context)
draw_gradient2(context)
end
end
app=CairoApp.new
app.show_all