basic modularization of ball and ball_face classes

This commit is contained in:
Antonio Carzaniga 2022-05-30 18:05:53 +02:00
parent 139d8d2997
commit 2240ba1b69
5 changed files with 82 additions and 86 deletions

139
balls.cc
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@ -1,6 +1,6 @@
#include <stdlib.h>
#include <math.h>
#include <assert.h>
#include <vector>
#include <cmath>
#include <cassert>
#include "game.h"
#include "balls.h"
@ -15,10 +15,10 @@ unsigned int v_min = 0;
unsigned int v_angle_min = 0;
unsigned int v_angle_max = 100;
struct ball * balls = 0;
ball * balls = nullptr;
unsigned int n_balls = 50;
static void random_velocity(struct ball * p) {
static void random_velocity(ball * p) {
double r2;
do {
p->v_x = v_min + rand() % (v_max + 1 - v_min);
@ -47,7 +47,7 @@ void balls_init_state () {
}
}
void ball_update_state (struct ball * p) {
void ball_update_state (ball * p) {
struct gravity_vector g;
gravity_get_vector (&g, p);
@ -87,7 +87,7 @@ void ball_update_state (struct ball * p) {
p->angle += 2*M_PI;
}
void ball_elastic_collision (struct ball * p, struct ball * q) {
void ball_elastic_collision (ball * p, ball * q) {
double dx = q->x - p->x;
double dy = q->y - p->y;
double d2 = dx*dx + dy*dy;
@ -112,7 +112,7 @@ void ball_elastic_collision (struct ball * p, struct ball * q) {
}
}
void ball_reposition (struct ball * b) {
void ball_reposition (ball * b) {
if (b->x < b->radius)
b->x = b->radius;
else if (b->x + b->radius > width)
@ -128,38 +128,35 @@ int face_rotation = 0;
static const double linear_rotation_unit = 2.0;
static unsigned int faces_count;
static struct ball_face ** faces;
static std::vector<ball_face *> faces;
struct ball_face {
class ball_face {
public:
ball_face (unsigned int radius, cairo_surface_t * face, int rotation);
~ball_face ();
cairo_surface_t * get_surface (double angle) const;
private:
unsigned int rotations;
cairo_surface_t ** c_faces;
std::vector <cairo_surface_t *> c_faces;
};
static double random_color_component() {
return 1.0*(rand() % 200 + 56)/255;
};
static struct ball_face * new_ball_face(unsigned int radius, cairo_surface_t * face, int rotation) {
struct ball_face * f = (struct ball_face *)malloc(sizeof(struct ball_face));
if (!f)
return 0;
ball_face::ball_face (unsigned int radius, cairo_surface_t * face, int rotation) {
if (face && rotation) {
f->rotations = 2*M_PI * radius / linear_rotation_unit;
rotations = 2*M_PI * radius / linear_rotation_unit;
} else {
f->rotations = 1;
rotations = 1;
}
f->c_faces = (cairo_surface_t **)malloc(sizeof(cairo_surface_t *)*f->rotations);
if (!f->c_faces) {
free(f);
return 0;
}
for (unsigned int i = 0; i < f->rotations; ++i) {
f->c_faces[i] = gdk_window_create_similar_surface(gtk_widget_get_window(canvas),
c_faces.resize(rotations);
for (unsigned int i = 0; i < rotations; ++i) {
c_faces[i] = gdk_window_create_similar_surface(gtk_widget_get_window(canvas),
CAIRO_CONTENT_COLOR_ALPHA,
2*radius, 2*radius);
assert(f->c_faces[i]);
cairo_t * ball_cr = cairo_create(f->c_faces[i]);
assert(c_faces[i]);
cairo_t * ball_cr = cairo_create(c_faces[i]);
cairo_translate(ball_cr, radius, radius);
cairo_arc(ball_cr, 0.0, 0.0, radius, 0, 2 * M_PI);
cairo_clip(ball_cr);
@ -167,7 +164,7 @@ static struct ball_face * new_ball_face(unsigned int radius, cairo_surface_t * f
if (face) {
int face_x_offset = cairo_image_surface_get_width (face) / 2;
int face_y_offset = cairo_image_surface_get_height (face) / 2;
cairo_rotate(ball_cr, i*2*M_PI/f->rotations);
cairo_rotate(ball_cr, i*2*M_PI/rotations);
cairo_scale (ball_cr, 1.0 * radius / face_x_offset, 1.0 * radius / face_y_offset);
cairo_set_source_surface(ball_cr, face, -face_x_offset, -face_y_offset);
cairo_paint(ball_cr);
@ -185,10 +182,27 @@ static struct ball_face * new_ball_face(unsigned int radius, cairo_surface_t * f
cairo_fill (ball_cr);
cairo_pattern_destroy (pat);
}
cairo_surface_flush(f->c_faces[i]);
cairo_surface_flush(c_faces[i]);
cairo_destroy(ball_cr);
}
return f;
}
ball_face::~ball_face() {
for (auto f : c_faces)
cairo_surface_destroy(f);
}
cairo_surface_t * ball_face::get_surface (double angle) const {
unsigned int face_id;
if (rotations == 1)
face_id = 0;
else {
face_id = rotations*angle/(2*M_PI);
assert(face_id < rotations);
if (face_id >= rotations)
face_id %= rotations;
}
return c_faces[face_id];
}
static void balls_init_faces () {
@ -203,69 +217,48 @@ static void balls_init_faces () {
}
}
if (face_surface) {
faces_count = radius_max + 1 - radius_min;
faces = (struct ball_face **)malloc(sizeof(struct ball_face *)*faces_count);
for (unsigned int i = 0; i < faces_count; ++i)
faces[i] = 0;
for(struct ball * b = balls; b != balls + n_balls; ++b) {
faces.assign(radius_max + 1 - radius_min, nullptr);
for(ball * b = balls; b != balls + n_balls; ++b) {
unsigned int r_idx = b->radius - radius_min;
if (!faces[r_idx])
faces[r_idx] = new_ball_face(b->radius, face_surface, face_rotation);
if (faces[r_idx] == nullptr)
faces[r_idx] = new ball_face (b->radius, face_surface, face_rotation);
b->face = faces[r_idx];
}
cairo_surface_destroy (face_surface);
} else {
faces_count = n_balls;
faces = (struct ball_face **)malloc(sizeof(struct ball_face *)*faces_count);
faces.resize(n_balls);
for (unsigned int i = 0; i < n_balls; ++i)
balls[i].face = faces[i] = new_ball_face(balls[i].radius, 0, face_rotation);
balls[i].face = faces[i] = new ball_face (balls[i].radius, 0, face_rotation);
}
}
void ball::draw (cairo_t * cr) const {
cairo_save (cr);
cairo_translate (cr, x - radius, y - radius);
cairo_set_source_surface(cr, face->get_surface (angle), 0, 0);
cairo_paint(cr);
cairo_restore(cr);
}
void balls_draw (cairo_t * cr) {
for (const struct ball * b = balls; b != balls + n_balls; ++b) {
cairo_save(cr);
cairo_translate(cr, b->x - b->radius, b->y - b->radius);
unsigned int face_id;
if (b->face->rotations == 1)
face_id = 0;
else {
face_id = b->face->rotations*b->angle/(2*M_PI);
assert(face_id < b->face->rotations);
if (face_id >= b->face->rotations)
face_id %= b->face->rotations;
}
cairo_set_source_surface(cr, b->face->c_faces[face_id], 0, 0);
cairo_paint(cr);
cairo_restore(cr);
}
for (const ball * b = balls; b != balls + n_balls; ++b)
b->draw(cr);
}
static void balls_destroy_faces () {
if (!faces)
return;
for (unsigned int i = 0; i < faces_count; ++i) {
if (faces[i]) {
if (faces[i]->c_faces) {
for (unsigned int j = 0; j < faces[i]->rotations; ++j)
cairo_surface_destroy(faces[i]->c_faces[j]);
free(faces[i]->c_faces);
}
free(faces[i]);
}
}
free (faces);
faces = 0;
faces_count = 0;
for (ball_face * f : faces)
if (f)
delete (f);
faces.clear();
}
void balls_destroy () {
balls_destroy_faces ();
free (balls);
delete [] (balls);
}
void balls_init () {
balls = (struct ball *)malloc(sizeof(struct ball)*n_balls);
balls = new ball[n_balls];
assert(balls);
balls_init_state ();
balls_init_faces ();

17
balls.h
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@ -3,9 +3,10 @@
#include <gtk/gtk.h>
struct ball_face;
class ball_face;
struct ball {
class ball {
public:
double x;
double y;
unsigned int radius;
@ -16,10 +17,12 @@ struct ball {
double angle;
double v_angle;
struct ball_face * face;
ball_face * face;
void draw (cairo_t * cr) const;
};
extern struct ball * balls;
extern ball * balls;
extern unsigned int n_balls;
extern unsigned int radius_min;
@ -36,9 +39,9 @@ extern int face_rotation;
extern void balls_init ();
extern void balls_destroy ();
extern void ball_update_state (struct ball * p);
extern void ball_elastic_collision (struct ball * p, struct ball * q);
extern void ball_reposition (struct ball * b);
extern void ball_update_state (ball * p);
extern void ball_elastic_collision (ball * p, ball * q);
extern void ball_reposition (ball * b);
extern void balls_draw (cairo_t * cr);
#endif

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@ -4,7 +4,7 @@
#include "balls.h"
void c_index_build();
void c_index_check_collisions(void (*collision)(struct ball *, struct ball *));
void c_index_check_collisions(void (*collision)(ball *, ball *));
int c_index_init();
void c_index_destroy();

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@ -11,12 +11,12 @@ struct gravity_vector {
extern void gravity_constant_field (double x, double y);
extern void gravity_newton_field (double r, double g);
extern void gravity_get_vector (struct gravity_vector * v, const struct ball * b);
extern void gravity_get_vector (gravity_vector * v, const ball * b);
extern void gravity_draw (cairo_t * cr);
extern void gravity_change (double dx, double dy);
extern void gravity_show ();
extern void gravity_collisions (struct ball * begin, struct ball * end);
extern void gravity_collisions (ball * begin, ball * end);
#endif

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@ -1,7 +1,7 @@
#ifndef SPACESHIP_H_INCLUDED
#define SPACESHIP_H_INCLUDED
extern struct ball spaceship;
extern ball spaceship;
extern void spaceship_init_state ();
extern void spaceship_update_state ();