The Birdfont Source Code


All Repositories / birdfont.git / blob – RSS feed

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

Revisions

View the latest version of libsvgbird/Ellipse.vala.
Bounding box for SVG rectangles
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 return false; 32 } 33 34 public override void draw_outline (Context cr) { 35 cr.save (); 36 cr.translate (cx, cy); 37 cr.scale (rx, ry); 38 cr.move_to (1, 0); 39 cr.arc (0, 0, 1, 0, 2 * PI); 40 cr.restore (); 41 } 42 43 public override void move (double dx, double dy) { 44 } 45 46 public override void rotate (double theta, double xc, double yc) { 47 } 48 49 public override bool is_empty () { 50 return false; 51 } 52 53 public override void resize (double ratio_x, double ratio_y) { 54 } 55 56 public override Object copy () { 57 Ellipse e = new Ellipse (); 58 Object.copy_attributes (this, e); 59 e.cx = cx; 60 e.cy = cy; 61 e.rx = rx; 62 e.ry = ry; 63 return e; 64 } 65 66 public override string to_string () { 67 return "Ellipse"; 68 } 69 70 public override void update_boundaries (Matrix view_matrix) { 71 Matrix object_matrix = transforms.get_matrix (); 72 object_matrix.multiply (object_matrix, view_matrix); 73 74 double radius_x = rx + style.stroke_width / 2; 75 double radius_y = ry + style.stroke_width / 2; 76 77 double px, py; 78 79 top = CANVAS_MAX; 80 bottom = CANVAS_MIN; 81 left = CANVAS_MAX; 82 right = CANVAS_MIN; 83 84 for (double a = 0; a < 2 * PI; a += (2 * PI) / 20) { 85 px = cx + radius_x * cos (a); 86 py = cy + radius_y * sin (a); 87 88 object_matrix.transform_point (ref px, ref py); 89 90 top = fmin (top, py); 91 bottom = fmax (bottom, py); 92 left = fmin (left, px); 93 right = fmax (right, px); 94 } 95 } 96 } 97 98 } 99