VALUE rbal_install_system(VALUE rself) {
return RBH_INT_BOOL(al_install_system(ALLEGRO_VERSION_INT, atexit));
}
int main(int argc, char **argv) {
A.x = 0;
A.y = 0;
B.x = 400;
B.y = 0;
C.x = 400;
C.y = 350;
D.x = 0;
D.y = 350;
if (!al_install_system(ALLEGRO_VERSION_INT, NULL)) {
printf("could not init Allegro\n");
return 1;
}
ALLEGRO_DISPLAY *display = al_create_display(800, 600);
if (!display) {
printf("could not create display\n");
return 1;
}
if (!al_init_primitives_addon()) {
printf("could not init primitives\n");
return 1;
}
if (!al_install_keyboard()) {
printf("could not install keybaord\n");
return 1;
}
if (!al_install_mouse()) {
printf("could not install mouse\n");
return 1;
}
ALLEGRO_BITMAP *bitmap = al_create_bitmap(800, 600);
if (bitmap == NULL) {
printf("could not create bitmap\n");
return 1;
}
al_set_target_bitmap(bitmap);
al_clear_to_color(al_map_rgb(255, 255, 255));
al_draw_rectangle(A.x + xOfs, A.y + yOfs, C.x + xOfs, C.y + yOfs, al_map_rgb(0, 0, 0), 2.0);
al_set_target_backbuffer(display);
al_draw_bitmap(bitmap, 0, 0, 0);
al_flip_display();
int pair1 = 0;
int pair2 = 0;
ALLEGRO_EVENT_QUEUE *queue = al_create_event_queue();
ALLEGRO_EVENT event;
al_register_event_source(queue, al_get_mouse_event_source());
al_register_event_source(queue, al_get_keyboard_event_source());
al_register_event_source(queue, al_get_display_event_source(display));
while (input_counter < 4) {
al_wait_for_event(queue, &event);
if (event.type == ALLEGRO_EVENT_MOUSE_BUTTON_DOWN && event.mouse.button == 1) {
input_points[input_counter].x = event.mouse.x;
input_points[input_counter].y = event.mouse.y;
input_counter++;
if (input_counter > 1) {
pair1 = input_counter - 2;
pair2 = input_counter - 1;
al_set_target_bitmap(bitmap);
al_draw_line(input_points[pair1].x, input_points[pair1].y, input_points[pair2].x, input_points[pair2].y, al_map_rgb(0, 150, 0), 3.0);
al_set_target_backbuffer(display);
al_draw_bitmap(bitmap, 0, 0, 0);
al_flip_display();
}
if (input_counter == 4) {
pair1 = 3;
pair2 = 0;
al_set_target_bitmap(bitmap);
al_draw_line(input_points[pair1].x, input_points[pair1].y, input_points[pair2].x, input_points[pair2].y, al_map_rgb(0, 150, 0), 3.0);
al_set_target_backbuffer(display);
al_draw_bitmap(bitmap, 0, 0, 0);
al_flip_display();
}
}
}
VECTOR AAPrime = getCornerOffset(input_points[0], A);
VECTOR BBPrime = getCornerOffset(input_points[1], B);
VECTOR CCPrime = getCornerOffset(input_points[2], C);
VECTOR DDPrime = getCornerOffset(input_points[3], D);
VECTOR AAPrimeS, BBPrimeS, CCPrimeS, DDPrimeS;
ALLEGRO_MOUSE_STATE state;
POINT p;
POINT PPPrime;
POINT center;
center.x = 0;
center.y = 0;
for (int i = 0; i < 4; i++) {
center.x += input_points[i].x;
center.y += input_points[i].y;
}
center.x /= 4;
center.y /= 4;
float total;
al_flush_event_queue(queue);
while (1) {
al_wait_for_event(queue, &event);
if (event.type != ALLEGRO_EVENT_MOUSE_AXES) {
if (event.type == ALLEGRO_EVENT_KEY_DOWN || event.type == ALLEGRO_EVENT_DISPLAY_CLOSE) {
break;
}
continue;
}
al_draw_bitmap(bitmap, 0, 0, 0);
// get the input point
al_get_mouse_state(&state);
p.x = state.x;
p.y = state.y;
// calculate the distances
float ADistance = distance(p, input_points[0]);
float BDistance = distance(p, input_points[1]);
float CDistance = distance(p, input_points[2]);
float DDistance = distance(p, input_points[3]);
float AB = ADistance / BDistance;
float BA = BDistance / ADistance;
total = AB + BA;
AB /= total;
BA /= total;
float topVec = AAPrime.y * BA + BBPrime.y * AB;
float ACurs = fabs(p.y - input_points[0].y);
float BCurs = fabs(p.y - input_points[1].y);
float topCurs = ACurs * BA + BCurs * AB;
al_draw_line(p.x, p.y, p.x, p.y + topVec, al_map_rgb(0, 255, 0), 4.0);
al_draw_circle(p.x, p.y + topVec, 5, al_map_rgb(0, 0, 0), 2.0);
float CD = CDistance / DDistance;
float DC = DDistance / CDistance;
total = DC + CD;
CD /= total;
DC /= total;
float bottomVec = CCPrime.y * DC + DDPrime.y * CD;
float DCurs = fabs(p.y - input_points[3].y);
float CCurs = fabs(p.y - input_points[2].y);
float bottomCurs = DCurs * CD + CCurs * DC;
al_draw_line(p.x, p.y, p.x, p.y + bottomVec, al_map_rgb(0, 255, 0), 4.0);
al_draw_circle(p.x, p.y + bottomVec, 5, al_map_rgb(0, 0, 0), 2.0);
float topBottom = topCurs / bottomCurs;
float bottomTop = bottomCurs / topCurs;
total = topBottom + bottomTop;
topBottom /= total;
bottomTop /= total;
float BC = BDistance / CDistance;
float CB = CDistance / BDistance;
total = BC + CB;
BC /= total;
CB /= total;
float rightVec = BBPrime.x * CB + CCPrime.x * BC;
BCurs = fabs(p.x - input_points[1].x);
CCurs = fabs(p.x - input_points[2].x);
float rightCurs= BCurs * CB + CCurs * BC;
al_draw_line(p.x, p.y, p.x + rightVec, p.y, al_map_rgb(0, 255, 0), 4.0);
al_draw_circle(p.x + rightVec, p.y, 5, al_map_rgb(0, 0, 0), 2.0);
float DA = DDistance / ADistance;
float AD = ADistance / DDistance;
total = DA + AD;
DA /= total;
AD /= total;
float leftVec = DDPrime.x * AD + AAPrime.x * DA;
ACurs = fabs(p.x - input_points[0].x);
DCurs = fabs(p.x - input_points[3].x);
float leftCurs = ACurs * DA + DCurs * AD;
al_draw_line(p.x, p.y, p.x + leftVec, p.y, al_map_rgb(0, 255, 0), 4.0);
al_draw_circle(p.x + leftVec, p.y, 5, al_map_rgb(0, 0, 0), 2.0);
float leftRight = leftCurs / rightCurs;
float rightLeft = rightCurs / leftCurs;
total = leftRight + rightLeft;
leftRight /= total;
rightLeft /= total;
// draw the main corner vectors
/* al_draw_line(input_points[0].x, input_points[0].y, input_points[0].x + AAPrime.x, input_points[0].y + AAPrime.y, al_map_rgb(0, 0, 0), 2.0);*/
/* al_draw_line(input_points[1].x, input_points[1].y, input_points[1].x + BBPrime.x, input_points[1].y + BBPrime.y, al_map_rgb(0, 0, 0), 2.0);*/
/* al_draw_line(input_points[2].x, input_points[2].y, input_points[2].x + CCPrime.x, input_points[2].y + CCPrime.y, al_map_rgb(0, 0, 0), 2.0);*/
/* al_draw_line(input_points[3].x, input_points[3].y, input_points[3].x + DDPrime.x, input_points[3].y + DDPrime.y, al_map_rgb(0, 0, 0), 2.0);*/
// draw the corner vector components
/* al_draw_line(input_points[0].x, input_points[0].y, input_points[0].x + AAPrime.x, input_points[0].y, al_map_rgb(255, 0, 0), 1.0);*/
/* al_draw_line(input_points[0].x, input_points[0].y, input_points[0].x, input_points[0].y + AAPrime.y, al_map_rgb(255, 0, 0), 1.0);*/
/* al_draw_line(input_points[1].x, input_points[1].y, input_points[1].x + BBPrime.x, input_points[1].y, al_map_rgb(255, 0, 0), 1.0);*/
/* al_draw_line(input_points[1].x, input_points[1].y, input_points[1].x, input_points[1].y + BBPrime.y, al_map_rgb(255, 0, 0), 1.0);*/
/* al_draw_line(input_points[2].x, input_points[2].y, input_points[2].x + CCPrime.x, input_points[2].y, al_map_rgb(255, 0, 0), 1.0);*/
/* al_draw_line(input_points[2].x, input_points[2].y, input_points[2].x, input_points[2].y + CCPrime.y, al_map_rgb(255, 0, 0), 1.0);*/
/* al_draw_line(input_points[3].x, input_points[3].y, input_points[3].x + DDPrime.x, input_points[3].y, al_map_rgb(255, 0, 0), 1.0);*/
/* al_draw_line(input_points[3].x, input_points[3].y, input_points[3].x, input_points[3].y + DDPrime.y, al_map_rgb(255, 0, 0), 1.0);*/
// draw the processed point
PPPrime.y = topVec * bottomTop + bottomVec * topBottom;
PPPrime.x = rightVec * leftRight + leftVec * rightLeft;
al_draw_line(p.x, p.y, p.x + PPPrime.x, p.y, al_map_rgb(0, 0, 255), 2.0);
al_draw_line(p.x, p.y, p.x, p.y + PPPrime.y, al_map_rgb(0, 0, 255), 2.0);
al_draw_circle(p.x + xOfs + PPPrime.x, p.y + yOfs + PPPrime.y, 5, al_map_rgb(0, 255, 0), 2.0);
al_draw_circle(p.x + xOfs + PPPrime.x, p.y + yOfs + PPPrime.y, 1, al_map_rgb(0, 0, 0), 1.0);
al_flip_display();
}
return 0;
}
