1. How can I make an image fully transparent? And then another thing id like to know is, is there a code where I can make a certain color transparent?
2 (THE MAIN QUESTION). I need some better collision detection, ive noticed (because ive colored in the transparencies to see) that collision isnt done fine. its always been kinda crappy, but at this point i need something more better. Here is an example using the player.
//Player Movement
if (key (_left))
flags = 1;
dir = -1;
ii = 0;
while (ii <4)
pixel = map_get_pixel(0, levelmask, playerx-11, playery);
get_rgb (pixel, & red, & green, & blue);
if (blue<220 or x==topx)
ii = 0;
break;
else
if (player_status!=2 and player_status!=3 and player_status!=6 and player_status!=7) player_status=1; end
walking=true;
end
ii = ii + 1;
end
x = x-ii;
end
if (key (_right))
flags = 0;
dir = 1;
ii = 0;
while (ii <4)
pixel = map_get_pixel(0, levelmask, playerx+11, playery);
get_rgb (pixel, & red, & green, & blue);
if (blue<220 or x==botx)
ii = 0;
break;
else
if (player_status!=2 and player_status!=3 and player_status!=6 and player_status!=7) player_status=1; end
walking=true;
end
ii = ii + 1;
end
x = x + ii;
end
// Jumping
if (key (__A))
if(!key_jump_is_already_pressed)
if(gun_ready)
player_status=6;
else
player_status=2;
end
falling=true;
pixel = map_get_pixel(0, levelmask, x, y +16);
get_rgb (pixel, & red, & green, & blue);
if (blue<220)
play_wav(jump_sound,0);
fall =- 20;
end
pixel = map_get_pixel(0, levelmask, x+6, y +16);
get_rgb (pixel, & red, & green, & blue);
if (blue<220)
play_wav(jump_sound,0);
fall =- 20;
end
pixel = map_get_pixel(0, levelmask, x-6, y +16);
get_rgb (pixel, & red, & green, & blue);
if (blue<220)
play_wav(jump_sound,0);
fall =- 20;
end
end
key_jump_is_already_pressed = true;//as long as x is held down, this is true
else
key_jump_is_already_pressed = false;//once space is released, this is false
end
// Implementation of fall.
ii = fall;
if(ii > 0)
while(ii != 0)
pixel=map_get_pixel(0, levelmask, x+6, y + (fall-ii) +15); //falling onto the left side of the mask
get_rgb (pixel, & red, & green, & blue);
if (blue<220)
ii = ii + 1;
falling=false;
if(!walking);
player_status=0;
else
player_status=1;
end
break;
end
pixel=map_get_pixel(0, levelmask, x-6, y + (fall-ii) +15); //falling onto the right side of the mask
get_rgb (pixel, & red, & green, & blue);
if (blue<220)
ii = ii + 1;
falling=false;
if(!walking);
player_status=0;
else
player_status=1;
end
break;
end
pixel=map_get_pixel(0, levelmask, x, y + (fall-ii) +15); //falling onto the right side of the mask
get_rgb (pixel, & red, & green, & blue);
if (blue<220)
ii = ii + 1;
falling=false;
if(!walking);
player_status=0;
else
player_status=1;
end
break;
end
ii = ii - 1;
end
else
ii = 0;
end
// Move the fall until we can.
y = y + (fall-ii);
PROBLEMS:
*If you are right under a platform(a 32 height hallway), you jump right through.
*Sometimes you can sidewalk up the walls
*if the ceiling "stairs" you get caught on it
*sometime if you land at an angel, you will be partially in the platform and slowly rise up properly
I was hoping a collison box would work like you said but it didnt
collision_box(type player_collision_box); That is the code I am using.
the player is 32x32 and the collision box is 18x24 so I don't know whats wrong
do you know of any better collision systems I can use for this? thanks!
the collision_box() (and collision() also) function is used to calculate collision between two processes. For hardnesses maps and levels it's ok to use the map_get_pixel() functions.
but can you give me an example of the first two? am i using the collision box right?
Not sure if I understood you well, but the normal collision system should be more accurate than collision_box():
if ( collision(TYPE anything) )
dosomething;
end
As a side note, when doing platformers, it's typical to implement this kind of things with hardness maps although it should be doable with collision_box().
Anyway, the problems you mention are quite typical when creating a platformer and usually come from not checking the hardness map well enough. Although your code looks nice (you seem to check the full movement line, which might be a bit overkill, but it's fine) if you share a working example of your code, we might be able to help better.
I wont upload my code online however pm me your email and i will send it to you