Class: Qt::GraphicsScene

Inherits:
Object show all
Defined in:
lib/roby/log/relations.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#default_arrow_brush ⇒ Object (readonly)

Returns the value of attribute default_arrow_brush.



305
306
307
 
# File 'lib/roby/log/relations.rb', line 305

def default_arrow_brush
  @default_arrow_brush
end

#default_arrow_pen ⇒ Object (readonly)

Returns the value of attribute default_arrow_pen.



304
305
306
 
# File 'lib/roby/log/relations.rb', line 304

def default_arrow_pen
  @default_arrow_pen
end

Instance Method Details

#add_arrow(size, pen = nil, brush = nil) ⇒ Object 



306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
 
# File 'lib/roby/log/relations.rb', line 306

def add_arrow(size, pen = nil, brush = nil)
    @default_arrow_pen   ||= Qt::Pen.new(ARROW_COLOR)
    @default_arrow_brush ||= Qt::Brush.new(ARROW_COLOR)

    @arrow_points ||= (1..4).map { Qt::PointF.new(0, 0) }
    @arrow_points[1].x = -size
    @arrow_points[1].y = size / 2
    @arrow_points[2].x = -size
    @arrow_points[2].y = -size / 2
    polygon = Qt::PolygonF.new(@arrow_points)
    @arrow_line ||=   Qt::LineF.new(-1, 0, 0, 0)

    ending = add_polygon polygon, (pen || default_arrow_pen), (brush || default_arrow_brush)
    line   = add_line @arrow_line

    line.parent_item = ending
    ending.singleton_class.class_eval { attr_accessor :line }
    ending.line = line
    ending
end