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pixelcity/Car.cpp

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/*-----------------------------------------------------------------------------
Car.cpp
2009 Shamus Young
-------------------------------------------------------------------------------
This creates the little two-triangle cars and moves them around the map.
-----------------------------------------------------------------------------*/
#define DEAD_ZONE 200
#define STUCK_TIME 230
#define UPDATE_INTERVAL 50 //milliseconds
#define MOVEMENT_SPEED 0.61f
#define CAR_SIZE 3.0f
#include <windows.h>
#include <math.h>
#include <gl\gl.h>
#include <gl\glu.h>
#include <gl\glaux.h>
#include "glTypes.h"
#include "building.h"
#include "car.h"
#include "camera.h"
#include "mesh.h"
#include "macro.h"
#include "math.h"
#include "random.h"
#include "render.h"
#include "texture.h"
#include "world.h"
#include "visible.h"
#include "win.h"
static GLvector direction[] =
{
0.0f, 0.0f, -1.0f,
1.0f, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f,
-1.0f, 0.0f, 0.0f,
};
static int dangles[] = { 0, 90, 180, 270};
static GLvector2 angles[360];
static bool angles_done;
static unsigned char carmap[WORLD_SIZE][WORLD_SIZE];
static CCar* head;
static unsigned next_update;
static int count;
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
int CarCount ()
{
return count;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void CarClear ()
{
CCar* c;
for (c = head; c; c = c->m_next)
c->Park ();
ZeroMemory (carmap, sizeof (carmap));
count = 0;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void CarRender ()
{
CCar* c;
if (!angles_done) {
for (int i = 0 ;i < 360; i++) {
angles[i].x = cosf ((float)i * DEGREES_TO_RADIANS) * CAR_SIZE;
angles[i].y = sinf ((float)i * DEGREES_TO_RADIANS) * CAR_SIZE;
}
}
glDepthMask (false);
glEnable (GL_BLEND);
glDisable (GL_CULL_FACE);
glBlendFunc (GL_ONE, GL_ONE);
glBindTexture (GL_TEXTURE_2D, 0);
glBindTexture(GL_TEXTURE_2D, TextureId (TEXTURE_HEADLIGHT));
for (c = head; c; c = c->m_next)
c->Render ();
glDepthMask (true);
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void CarUpdate ()
{
CCar* c;
unsigned now;
if (!TextureReady () || !EntityReady ())
return;
now = GetTickCount ();
if (next_update > now)
return;
next_update = now + UPDATE_INTERVAL;
for (c = head; c; c = c->m_next)
c->Update ();
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
CCar::CCar ()
{
m_ready = false;
m_next = head;
head = this;
count++;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
bool CCar::TestPosition (int row, int col)
{
//test the given position and see if it's already occupied
if (carmap[row][col])
return false;
//now make sure that the lane is going the right direction
if (WorldCell (row, col) != WorldCell (m_row, m_col))
return false;
return true;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void CCar::Update (void)
{
int new_row, new_col;
GLvector old_pos;
GLvector camera;
//If the car isn't ready, place it on the map and get it moving
camera = CameraPosition ();
if (!m_ready) {
//if the car isn't ready, we need to place it somewhere on the map
m_row = DEAD_ZONE + RandomVal (WORLD_SIZE - DEAD_ZONE * 2);
m_col = DEAD_ZONE + RandomVal (WORLD_SIZE - DEAD_ZONE * 2);
//if there is already a car here, forget it.
if (carmap[m_row][m_col] > 0)
return;
//if this spot is not a road, forget it
if (!(WorldCell (m_row, m_col) & CLAIM_ROAD))
return;
if (!Visible (glVector ((float)m_row, 0.0f, (float)m_col)))
return;
//good spot. place the car
m_position = glVector ((float)m_row, 0.1f, (float)m_col);
m_drive_position = m_position;
m_ready = true;
if (WorldCell (m_row, m_col) & MAP_ROAD_NORTH)
m_direction = NORTH;
if (WorldCell (m_row, m_col) & MAP_ROAD_EAST)
m_direction = EAST;
if (WorldCell (m_row, m_col) & MAP_ROAD_SOUTH)
m_direction = SOUTH;
if (WorldCell (m_row, m_col) & MAP_ROAD_WEST)
m_direction = WEST;
m_drive_angle = dangles[m_direction];
m_max_speed = (float)(4 + RandomVal (6)) / 10.0f;
m_speed = 0.0f;
m_change = 3;
m_stuck = 0;
carmap[m_row][m_col]++;
}
//take the car off the map and move it
carmap[m_row][m_col]--;
old_pos = m_position;
m_speed += m_max_speed * 0.05f;
m_speed = MIN (m_speed, m_max_speed);
m_position += direction[m_direction] * MOVEMENT_SPEED * m_speed;
//If the car has moved out of view, there's no need to keep simulating it.
if (!Visible (glVector ((float)m_row, 0.0f, (float)m_col)))
m_ready = false;
//if the car is far away, remove it. We use manhattan units because buildings almost always
//block views of cars on the diagonal.
if (fabs (camera.x - m_position.x) + fabs (camera.z - m_position.z) > RenderFogDistance ())
m_ready = false;
//if the car gets too close to the edge of the map, take it out of play
if (m_position.x < DEAD_ZONE || m_position.x > (WORLD_SIZE - DEAD_ZONE))
m_ready = false;
if (m_position.z < DEAD_ZONE || m_position.z > (WORLD_SIZE - DEAD_ZONE))
m_ready = false;
if (m_stuck >= STUCK_TIME)
m_ready = false;
if (!m_ready)
return;
//Check the new position and make sure its not in another car
new_row = (int)m_position.x;
new_col = (int)m_position.z;
if (new_row != m_row || new_col != m_col) {
//see if the new position places us on top of another car
if (carmap[new_row][new_col]) {
m_position = old_pos;
m_speed = 0.0f;
m_stuck++;
} else {
//look at the new position and decide if we're heading towards or away from the camera
m_row = new_row;
m_col = new_col;
m_change--;
m_stuck = 0;
if (m_direction == NORTH)
m_front = camera.z < m_position.z;
else if (m_direction == SOUTH)
m_front = camera.z > m_position.z;
else if (m_direction == EAST)
m_front = camera.x > m_position.x;
else
m_front = camera.x < m_position.x;
}
}
m_drive_position = (m_drive_position + m_position) / 2.0f;
//place the car back on the map
carmap[m_row][m_col]++;
}
/*-----------------------------------------------------------------------------
-----------------------------------------------------------------------------*/
void CCar::Render ()
{
GLvector pos;
int angle;
int turn;
float top;
if (!m_ready)
return;
if (!Visible (m_drive_position))
return;
if (m_front) {
glColor3f (1, 1, 0.8f);
top = CAR_SIZE;
} else {
glColor3f (0.5, 0.2f, 0);
top = 0.0f;
}
glBegin (GL_QUADS);
angle = dangles[m_direction];
pos = m_drive_position;//
angle = 360 - (int)MathAngle (m_position.x, m_position.z, pos.x, pos.z);
angle %= 360;
turn = (int)MathAngleDifference ((float)m_drive_angle, (float)angle);
m_drive_angle += SIGN (turn);
pos += glVector (0.5f, 0.0f, 0.5f);
glTexCoord2f (0, 0);
glVertex3f (pos.x + angles[angle].x, -CAR_SIZE, pos.z + angles[angle].y);
glTexCoord2f (1, 0);
glVertex3f (pos.x - angles[angle].x, -CAR_SIZE, pos.z - angles[angle].y);
glTexCoord2f (1, 1);
glVertex3f (pos.x - angles[angle].x, top, pos.z - angles[angle].y);
glTexCoord2f (0, 1);
glVertex3f (pos.x + angles[angle].x, top, pos.z + angles[angle].y);
glEnd ();
}
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