The Birdfont Source Code


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Circle.vala in /libsvgbird

This file is a part of the Birdfont project.

Contributing

Send patches or pull requests to johan.mattsson.m@gmail.com.
Clone this repository: git clone https://github.com/johanmattssonm/birdfont.git
Circle boundaries heads/master
1 /* 2 Copyright (C) 2016 Johan Mattsson 3 4 This library is free software; you can redistribute it and/or modify 5 it under the terms of the GNU Lesser General Public License as 6 published by the Free Software Foundation; either version 3 of the 7 License, or (at your option) any later version. 8 9 This library is distributed in the hope that it will be useful, but 10 WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 */ 14 15 using Cairo; 16 17 namespace SvgBird { 18 19 public class Circle : Object { 20 21 public double cx = 0; 22 public double cy = 0; 23 public double r = 0; 24 25 public Circle () { 26 } 27 28 public override bool is_over (double x, double y) { 29 to_object_view (ref x, ref y); 30 double dx = x - cx; 31 double dy = y - cy; 32 return Math.sqrt (dx * dx + dy * dy) <= r; 33 } 34 35 public override void draw_outline (Context cr) { 36 cr.move_to (cx + r, cy); 37 cr.arc (cx, cy, r, 0, 2 * Math.PI); 38 } 39 40 public override bool is_empty () { 41 return false; 42 } 43 44 public override Object copy () { 45 Circle c = new Circle (); 46 47 Object.copy_attributes (this, c); 48 c.cx = cx; 49 c.cy = cy; 50 c.r = r; 51 52 return c; 53 } 54 55 public override string to_string () { 56 return "Circle"; 57 } 58 } 59 60 } 61