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draw: ability to draw ellipse

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This commit is contained in:
Jeremy Attali 2019-12-22 11:50:08 -05:00
parent 279cd6d317
commit f2432a0aaa
1 changed files with 8 additions and 2 deletions
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10
src/draw.c
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@ -79,12 +79,18 @@ static void draw_shape_ellipse(cairo_t *cr, struct swappy_shape *shape) {
double xc = shape->from.x + ((shape->to.x - shape->from.x) / 2);
double yc = shape->from.y + ((shape->to.y - shape->from.y) / 2);
double r = sqrt(x * x + y * y) / 2;
double n = sqrt(x * x + y * y);
double r = n / 2;
cairo_set_source_rgba(cr, 1, 0, 0, 1);
cairo_set_line_width(cr, 2);
cairo_arc(cr, xc, yc, r, 0, 2 * M_PI);
cairo_matrix_t save_matrix;
cairo_get_matrix(cr, &save_matrix);
cairo_translate(cr, xc, yc);
cairo_scale(cr, x / n, y / n);
cairo_arc(cr, 0, 0, r, 0, 2 * M_PI);
cairo_set_matrix(cr, &save_matrix);
cairo_stroke(cr);
cairo_close_path(cr);
}