78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
#include <math.h>
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#include <gtk/gtk.h>
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#include "balls.h"
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#include "game.h"
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struct ball spaceship;
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double spaceship_thrust = 0;
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int spaceship_thrust_countdown = 0;
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int spaceship_thrust_init = 50;
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void spaceship_init_state () {
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spaceship.x = width/2;
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spaceship.y = height/2;
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spaceship.radius = 30;
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spaceship.v_x = 0;
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spaceship.v_y = 0;
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spaceship.angle = 0;
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spaceship.v_angle = 0;
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}
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void spaceship_update_state () {
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if (spaceship_thrust > 0) {
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double fx = cos(spaceship.angle)*spaceship_thrust*4.0;
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double fy = sin(spaceship.angle)*spaceship_thrust*4.0;
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spaceship.x += delta*delta*fx/2.0;
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spaceship.v_x += delta*fx;
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spaceship.y += delta*delta*fy/2.0;
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spaceship.v_y += delta*fy;
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if (spaceship_thrust_countdown > 0)
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--spaceship_thrust_countdown;
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else
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spaceship_thrust = 0;
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}
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ball_update_state(&spaceship);
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}
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void spaceship_draw (cairo_t * cr) {
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static const double one_over_sqrt_2 = 0.70710678118654752440;
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cairo_save(cr);
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cairo_set_source_rgba(cr, 0.0, 0.0, 1.0, 1.0);
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cairo_translate(cr, spaceship.x, spaceship.y);
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cairo_rotate(cr, spaceship.angle);
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cairo_arc(cr, 0, 0, spaceship.radius, 0, 2*M_PI);
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cairo_stroke(cr);
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cairo_set_source_rgba(cr, 0.0, 1.0, 0.0, 1.0);
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cairo_move_to (cr, 0, 0);
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cairo_line_to (cr, -one_over_sqrt_2*spaceship.radius, one_over_sqrt_2*spaceship.radius);
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cairo_line_to (cr, spaceship.radius, 0);
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cairo_line_to (cr, -one_over_sqrt_2*spaceship.radius, -one_over_sqrt_2*spaceship.radius);
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cairo_line_to (cr, 0, 0);
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cairo_stroke(cr);
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cairo_set_source_rgba(cr, 1.0, 0.5, 0.0, 1.0);
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for (unsigned int i = 0; i < spaceship_thrust; i += 5) {
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double d_angle = spaceship.radius/(spaceship.radius + 0.1*i)*0.25*M_PI*(1 - 0.99*i/spaceship_thrust);
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cairo_set_source_rgba(cr, 1.0, 1.0*(1 - 0.5*i/spaceship_thrust), 0.0, 1.0);
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cairo_arc(cr, 0, 0, spaceship.radius + i, M_PI - d_angle, M_PI + d_angle);
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cairo_stroke(cr);
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if (d_angle > 0.05)
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d_angle = 0.7*d_angle;
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}
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cairo_restore(cr);
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}
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void spaceship_control (double dx, double dy) {
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spaceship.angle -= dx/4;
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if (spaceship.angle < 0)
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spaceship.angle += 2*M_PI;
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else if (spaceship.angle > 2*M_PI)
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spaceship.angle -= 2*M_PI;
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spaceship_thrust += dy;
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if (spaceship_thrust > 0)
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spaceship_thrust_countdown = spaceship_thrust_init;
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else
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spaceship_thrust = 0;
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}
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