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(spaceship_draw) better shape for thrust waves

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This commit is contained in:
Antonio Carzaniga 2021-12-11 22:29:55 +01:00
parent 9028f1af74
commit dc0e5be086
1 changed files with 6 additions and 1 deletions
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7
spaceship.c
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@ -51,9 +51,14 @@ void spaceship_draw (cairo_t * cr) {
cairo_line_to (cr, -one_over_sqrt_2*spaceship.radius, -one_over_sqrt_2*spaceship.radius);
cairo_line_to (cr, 0, 0);
cairo_stroke(cr);
cairo_set_source_rgba(cr, 1.0, 0.5, 0.0, 1.0);
for (unsigned int i = 0; i < spaceship_thrust; i += 5) {
cairo_arc(cr, 0, 0, spaceship.radius + i, 0.7*M_PI, 1.3*M_PI);
double d_angle = spaceship.radius/(spaceship.radius + 0.1*i)*0.25*M_PI*(1 - 0.99*i/spaceship_thrust);
cairo_set_source_rgba(cr, 1.0, 1.0*(1 - 0.5*i/spaceship_thrust), 0.0, 1.0);
cairo_arc(cr, 0, 0, spaceship.radius + i, M_PI - d_angle, M_PI + d_angle);
cairo_stroke(cr);
if (d_angle > 0.05)
d_angle = 0.7*d_angle;
}
cairo_restore(cr);
}