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| Collision with Mappy |
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evantage
Member #15,489
February 2014
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Hello, I am using Mappy with Allegro 5 to create and render my map however I am having trouble creating a working pixel perfect collision check for the walls. The walls are flagged in mappy and I have a function set up to check: 1int Map::collided(int x, int y)
2{
3 BLKSTR *blockdata;
4 blockdata = MapGetBlockInPixels(x,y);
5
6 return (blockdata->user1);
7}
And I have checks for all directions, the up and down functions seem to be working perfectly however the left and right ones are not: 2bool Character::collideLeft()
3{
4 int highX = 0;
5 int highY = 0;
6
7 if(p_Map->collided(m_xpos, m_ypos) || p_Map->collided(m_xpos, m_ypos+m_height-1))
8 {
9 al_lock_bitmap(m_sys_bitmap, al_get_bitmap_format(m_sys_bitmap), ALLEGRO_LOCK_READONLY);
10
11 ALLEGRO_COLOR pixel;
12
13 for(int x = m_frame_column*m_width; x < (m_frame_column*m_width)+m_width; x++)
14 for(int y = m_frame_row; y < (m_frame_row*m_height)+m_height+1; y++)
15 {
16 pixel = al_get_pixel(m_sys_bitmap, x, y);
17
18 if(pixel.a > 0)
19 {
20 if(y < highY)
21 highY = y;
22 if(x < highY)
23 highX = x;
24 }
25 }
26
27 if(p_Map->collided(m_xpos+highX,m_ypos+highY))
28 {
29 cout << highX << ", " << highY << endl;
30 al_unlock_bitmap(m_sys_bitmap);
31 return true;
32 }
33
34 else
35 {
36 al_unlock_bitmap(m_sys_bitmap);
37 return true;
38 }
39 }
40}
Now I have tried many methods and can see the flaws in the one above however this is the attempt I tried last, could anyone advise me on a simpler method, perhaps checking pixels on system bitmaps isn't the right way. It does work fine for collision between two other bitmaps though. |
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