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gtk_sample.cr
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gtk_sample.cr
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require "gobject/gtk/autorun"
require "cairo/cairo"
class CairoApp
@window : Gtk::Window
delegate show_all, to: @window
def initialize
@window = Gtk::Window.new
@window.title = "Cairo drawing"
@window.resize 600,300
@window.connect "destroy", &->Gtk.main_quit
hb = Gtk::Box.new :horizontal, 2
bbox = Gtk::ButtonBox.new :vertical
btn1 = Gtk::Button.new_with_label "draw text"
btn1.on_clicked { draw_text }
bbox.pack_start(btn1, expand = true, fill = true, padding = 2)
btn2 = Gtk::Button.new_with_label "fill and stroke"
btn2.on_clicked { fill_and_stroke }
bbox.pack_start(btn2, expand = true, fill = true, padding = 2)
btn3 = Gtk::Button.new_with_label "line caps"
btn3.on_clicked { line_caps }
bbox.pack_start(btn3, expand = true, fill = true, padding = 2)
btn4 = Gtk::Button.new_with_label "line joins"
btn4.on_clicked { line_joins }
bbox.pack_start(btn4, expand = true, fill = true, padding = 2)
btn5 = Gtk::Button.new_with_label "pen dashes"
btn5.on_clicked { pen_dashes }
bbox.pack_start(btn5, expand = true, fill = true, padding = 2)
btn6 = Gtk::Button.new_with_label "transparent"
btn6.on_clicked { transparent }
bbox.pack_start(btn6, expand = true, fill = true, padding = 2)
btn7 = Gtk::Button.new_with_label "clip"
btn7.on_clicked { clip }
bbox.pack_start(btn7, expand = true, fill = true, padding = 2)
btn8 = Gtk::Button.new_with_label "clip image"
btn8.on_clicked { clip_image }
bbox.pack_start(btn8, expand = true, fill = true, padding = 2)
scrolledwindow = Gtk::ScrolledWindow.new nil, nil
scrolledwindow.hexpand = true
scrolledwindow.vexpand = true
darea = Gtk::DrawingArea.new
@darea = darea.as Gtk::DrawingArea
darea.connect "draw",&->draw_white_rect
scrolledwindow.add darea
hb.add bbox
hb.add scrolledwindow
@window.add hb
end
def draw_white_rect
context = Gdk.cairo_create(@darea.window.not_nil!)
context.set_source_rgb( 1.0, 1.0, 1.0)
context.rectangle(0, 0, 1600, 1300)
context.stroke_preserve
context.fill
end
def draw_text
draw_white_rect
context = Gdk.cairo_create(@darea.window.not_nil!)
context.set_source_rgb(0, 0, 100)
context.select_font_face("Sans", Cairo::FontSlant::NORMAL , Cairo::FontWeight::NORMAL)
context.font_size=40
t_e = context.text_extents("Cairo draw text!")
x = (@darea.allocated_width - t_e.width)/2
y = (@darea.allocated_height - t_e.height)/2
context.move_to(x,y)
context.show_text("Cairo draw text!")
end
def fill_and_stroke
draw_white_rect
context = Gdk.cairo_create(@darea.window.not_nil!)
context.line_width=9
context.set_source_rgb( 0.69, 0.19, 0)
context.translate(250,150)
context.arc(0,0,50,0,6.283)
context.stroke_preserve
context.set_source_rgb( 0.30, 0.40, 0.60)
context.fill
end
def line_caps
draw_white_rect
context = Gdk.cairo_create(@darea.window.not_nil!)
context.set_source_rgb( 0.3, 0.19, 0.4)
context.line_width= 20
context.font_size= 20
context.line_cap=Cairo::LineCap::BUTT
context.move_to(100, 50)
context.line_to(300, 50)
context.stroke
context.move_to(320,50).show_text("BUTT")
context.line_cap=Cairo::LineCap::ROUND
context.move_to(100, 150)
context.line_to(300, 150)
context.stroke
context.move_to(320,150).show_text("ROUND")
context.line_cap=Cairo::LineCap::SQUARE
context.move_to(100, 250)
context.line_to(300, 250)
context.stroke
context.move_to(320,250).show_text("SQUARE")
context.line_width=1.5
context.move_to(100, 50)
context.line_to(100, 250)
context.stroke
context.move_to(300, 50)
context.line_to(300, 250)
context.stroke
context.move_to(310, 50)
context.line_to(310, 250)
context.stroke
end
def line_joins
draw_white_rect
context = Gdk.cairo_create(@darea.window.not_nil!)
context.set_source_rgb( 0.3, 0.19, 0.4)
context.font_size= 20
context.rectangle(130, 30, 100, 100)
context.line_width=14
context.line_join=Cairo::LineJoin::MITER
context.stroke
context.move_to(150,80).show_text("MITER")
context.rectangle(260, 30, 100, 100)
context.line_width=14
context.line_join=Cairo::LineJoin::BEVEL
context.stroke
context.move_to(280,80).show_text("BEVEL")
context.rectangle(200, 160, 100, 100)
context.line_width=14
context.line_join=Cairo::LineJoin::ROUND
context.stroke
context.move_to(210,210).show_text("ROUND")
end
def pen_dashes
draw_white_rect
context = Gdk.cairo_create(@darea.window.not_nil!)
context.set_source_rgb( 0.69, 0.19, 0)
dashed1 = [4.0, 21.0, 2.0]
dashed2 = [14.0, 6.0]
dashed3 = [1.0]
context.line_width=1.5
context.set_dash(dashed1, 0)
context.move_to(100, 30)
context.line_to(400, 30)
context.stroke
context.set_dash(dashed2, 0)
context.move_to(100,150)
context.line_to(400,150)
context.stroke
context.set_dash(dashed3, 0)
context.move_to(100,250)
context.line_to(400,250)
context.stroke
end
def transparent
draw_white_rect
context = Gdk.cairo_create(@darea.window.not_nil!)
i=1
while i < 10
context.set_source_rgba(0, 0, 1, i*0.1)
context.rectangle(Float64.new(20+50*(i-1)), Float64.new(20+25*(i-1)), 40.0, 40.0)
context.fill
context.set_source_rgba(1, 0, 0, 1-i*0.1)
context.rectangle(Float64.new(20+50*(i-1)), Float64.new(245-25*(i-1)), 40.0, 40.0)
context.fill
i = i + 1
end
end
def clip
draw_white_rect
context = Gdk.cairo_create(@darea.window.not_nil!)
context.arc(@darea.allocated_width/2,@darea.allocated_height/2, @darea.allocated_height/2.5 , 0, 6.283)
context.clip
context.new_path
context.rectangle(0, 0, @darea.allocated_width, @darea.allocated_height)
context.fill
context.set_source_rgb(0, 1, 0)
context.move_to(0, 0)
context.line_to(@darea.allocated_width, @darea.allocated_height)
context.move_to(@darea.allocated_width, 0)
context.line_to(0, @darea.allocated_height)
context.line_width = 10
context.stroke
end
def clip_image
draw_white_rect
context = Gdk.cairo_create(@darea.window.not_nil!)
context.arc(@darea.allocated_width / 2, @darea.allocated_height / 2, @darea.allocated_height / 2.5 , 0, 6.283)
context.clip
context.new_path
image = Cairo::Surface.create_from_png("samples/image.png")
w = image.width
h = image.height
context.scale(Float64.new(@darea.allocated_width / w),Float64.new(@darea.allocated_height / h))
context.set_source_surface(image, 0, 0)
context.paint
end
end
app=CairoApp.new
app.show_all