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Fixed collision detection if player moves parallel to line

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This commit is contained in:
T-moe
2016-01-30 16:26:56 +01:00
parent 09425ccf07
commit b6f2e470c2
1 changed files with 78 additions and 32 deletions
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108
src/game.c
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@@ -40,48 +40,81 @@ void game_init(game_t* game, uint16_t ticks_per_sec) {
game->ticks_sum_sec = 0;
}
//Checks if the player head (+pixels in moving direction) collides with the line with the points start & end
bool game_check_line_collision(player_t* player, point_t start, point_t end, uint8_t pixels){
bool line_is_horizontal = (start.y == end.y);
bool player_is_horizontal = (player->direction == left || player->direction == right);
if(line_is_horizontal == player_is_horizontal){ // if player moves parallel to the line, there is no point in checking
return false; // no collision possible because parallel moving
}
if(line_is_horizontal == player_is_horizontal){ // if player moves parallel to the line
if(!player_is_horizontal && (player->position.x < min(start.x, end.x) || player->position.x > max(start.x, end.x))){
return false; // if player is passing by horizontally, no collision possible
}
if(player_is_horizontal && start.y != player->position.y ) {
return false; // player is not on the same height as the line, no collision possible
}
if(player_is_horizontal && (player->position.y < min(start.y, end.y) || player->position.y > max(start.y, end.y))){
return false; // if player is passing by vertically, no collision possible
}
if(!player_is_horizontal && start.x != player->position.x ) {
return false; // player is not on the same column as the line, no collision possible
}
switch(player->direction){
case up:
if(player->position.y > start.y && ((int16_t)player->position.y - pixels) <= start.y) {
return true; // going up and hitting a line segment
}
break;
case down:
if(player->position.y < start.y && ((int16_t)player->position.y + pixels) >= start.y) {
return true; // going down and hitting a line segment
}
break;
case left:
if(player->position.x > start.x && ((int16_t)player->position.x - pixels) <= start.x) {
return true; // going left and hitting a line segment
}
break;
case right:
if(player->position.x < start.x && ((int16_t)player->position.x + pixels) >= start.x) {
return true; // going right and hitting a line segment
}
break;
switch(player->direction){
case up:
if(((int16_t)player->position.y - pixels) <= max(start.y,end.y) && ((int16_t)player->position.y - pixels) >= min(start.y,end.y)) {
return true; // player head is inside of line
}
break;
case down:
if(((int16_t)player->position.y + pixels) >= min(start.y,end.y) && ((int16_t)player->position.y + pixels) <= max(start.y,end.y)) {
return true;
}
break;
case left:
if(((int16_t)player->position.x - pixels) <= max(start.x,end.x) && ((int16_t)player->position.x - pixels) >= min(start.x,end.x)) {
return true;
}
break;
case right:
if(((int16_t)player->position.x + pixels) >= min(start.x,end.x) && ((int16_t)player->position.x + pixels) <= max(start.x,end.x)) {
return true;
}
break;
}
} else { //Player moves antiparalell to the line
if(!player_is_horizontal && (player->position.x < min(start.x, end.x) || player->position.x > max(start.x, end.x))){
return false; // if player is passing by horizontally, no collision possible
}
if(player_is_horizontal && (player->position.y < min(start.y, end.y) || player->position.y > max(start.y, end.y))){
return false; // if player is passing by vertically, no collision possible
}
switch(player->direction){
case up:
if(player->position.y > start.y && ((int16_t)player->position.y - pixels) <= start.y) {
return true; // going up and hitting a line segment
}
break;
case down:
if(player->position.y < start.y && ((int16_t)player->position.y + pixels) >= start.y) {
return true; // going down and hitting a line segment
}
break;
case left:
if(player->position.x > start.x && ((int16_t)player->position.x - pixels) <= start.x) {
return true; // going left and hitting a line segment
}
break;
case right:
if(player->position.x < start.x && ((int16_t)player->position.x + pixels) >= start.x) {
return true; // going right and hitting a line segment
}
break;
}
}
return false;
}
//Check if the player head (+pixels in moving direction) collides with the game field boundary
bool game_check_boundary_collision(game_t* game, player_t* player, uint8_t pixels){
// Check boundary collision
@@ -111,6 +144,7 @@ bool game_check_boundary_collision(game_t* game, player_t* player, uint8_t pixel
return false;
}
//Check if the player (+pixels in moving direction) collides with any other player (including itself)
bool game_check_player_collision(game_t* game, player_t* player, uint8_t pixels){
// Check for collisions with players (including self)
for(int i = 0; i < PLAYER_COUNT; i++){
@@ -138,7 +172,8 @@ bool game_check_player_collision(game_t* game, player_t* player, uint8_t pixels)
return false;
}
bool game_check_collision(game_t* game, player_t* player, uint8_t pixels){ // Check boundary and player collisions
//Check if the player (+pixels in moving direction) collides either with other players (including self) or the game field boundary
bool game_check_collision(game_t* game, player_t* player, uint8_t pixels) {
// Check for collisions with boundarys
if(game_check_boundary_collision(game, player, pixels)){
@@ -153,6 +188,8 @@ bool game_check_collision(game_t* game, player_t* player, uint8_t pixels){ // Ch
return false; // no collision!
}
//Update the player state and draw the player. The player head will be moved by "pixels" in moving direction.
//Returns true if the player state has changed
bool game_player_update(game_t* game, player_t* player, uint8_t pixels){
bool direction_change = false;
@@ -226,6 +263,7 @@ bool game_player_update(game_t* game, player_t* player, uint8_t pixels){
return state_changed; // return state
}
//Calculates two colors out of the 16 bits, passed in confbits.
void game_get_color(uint16_t confbits, uint16_t* player1_color, uint16_t* player2_color) {
//we have 4 bits per player color, we use 1 bit for red, 2 for green, 1 for blue
@@ -260,6 +298,8 @@ void game_get_color(uint16_t confbits, uint16_t* player1_color, uint16_t* player
}
}
//Calculates one step of the game, when the game is in the init state
//Returns true if the function was blocking, and deltaTicks should be reset
bool game_step_init(game_t* game) {
//Draw welcome bitmap
@@ -276,6 +316,8 @@ bool game_step_init(game_t* game) {
return true;
}
//Calculates one step of the game, when the game is in the prestart state
//Returns true if the function was blocking, and deltaTicks should be reset
bool game_step_prestart(game_t* game) {
//Draw "Player x: Color" Strings
@@ -427,6 +469,8 @@ bool game_step_prestart(game_t* game) {
return true;
}
//Calculates one step of the game, when the game is in the running state
//Returns true if the function was blocking, and deltaTicks should be reset
bool game_step_running(game_t* game, uint64_t delta_time)
{
@@ -484,6 +528,8 @@ bool game_step_running(game_t* game, uint64_t delta_time)
}
}
//Calculates one step of the game, when the game is in the ended state
//Returns true if the function was blocking, and deltaTicks should be reset
bool game_step_ended(game_t* game) {
// Kill screen