The Birdfont Source Code


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Ellipse.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 using Math; 17 18 namespace SvgBird { 19 20 public class Ellipse : Object { 21 22 public double cx = 0; 23 public double cy = 0; 24 public double rx = 0; 25 public double ry = 0; 26 27 public Ellipse () { 28 } 29 30 public override bool is_over (double x, double y) { 31 to_object_view (ref x, ref y); 32 double point_x = x - cx; 33 double point_y = y - cy; 34 return (point_x * point_x) / (rx * rx) + (point_y * point_y) / (ry * ry) <= 1; 35 } 36 37 public override void draw_outline (Context cr) { 38 cr.save (); 39 cr.translate (cx, cy); 40 cr.scale (rx, ry); 41 cr.move_to (1, 0); 42 cr.arc (0, 0, 1, 0, 2 * PI); 43 cr.restore (); 44 } 45 46 public override bool is_empty () { 47 return false; 48 } 49 50 public override Object copy () { 51 Ellipse e = new Ellipse (); 52 Object.copy_attributes (this, e); 53 e.cx = cx; 54 e.cy = cy; 55 e.rx = rx; 56 e.ry = ry; 57 return e; 58 } 59 60 public override string to_string () { 61 return "Ellipse"; 62 } 63 64 } 65 66 } 67