bullet and bomb collisions
BlitzPlus Forums/BlitzPlus Beginners Area/bullet and bomb collisions
| ||
| I have a space invaders like 2d game. Here's my code for collisions from alien bomb to player ship, and it works: ;check each bullet for contact with alien then creates explosion picture too. ;update And draw alien bombs For bombs.bomb = Each bomb ;sets alien bombs to move from alien ship towards player ship bombs\y = bombs\y + 4 ;draws bomb DrawImage img_bomb,bombs\x,bombs\y ;checks for collision with alien bombs and players ship If ImagesCollide(img_bomb,bombs\x,bombs\y,0,img_ship,x,y,0) Then ;plays player explosion sound once alien bombs hits player ship PlaySound(snd_shithit) ;sets lives minus by 1 if alien bomb hits player ship and updated in lives screen lives = lives - 1 ;delets bombs once hits player ship Delete bombs ;generates player ship explosion images once alien bombs hit player ship DrawImage img_shipd,x,y ;checks to see if alien bombs passes 600 y coordinate ElseIf bombs\y > 600 Then ;deletes bombs if alien bombs is greater then 600 y coordinate Delete bombs EndIf Next I am trying to create collisions for player bullets and alien bombs. I was told this is possible, just need to create another cycle to update bullets and alien bomb? Here's my attempt on bullets and bombs code: ;update And draw alien bombs For bombs.bomb = Each bomb bombs\y = bombs\y + 4 ;draws bomb DrawImage img_bomb,bombs\x,bombs\y next ;checks for collision with alien bombs and players ship for b.bullet = each bullet b\x=x b\y=b\y -5 drawimage img_bullet,b\x,b\y next If ImagesCollide(img_bomb,bombs\x,bombs\y,0,img_bullet,b\x,b\y,0) Then ;plays player explosion sound once alien bombs hits player ship PlaySound(snd_shithit) ;deletes bombs and bullets once hits each other Delete bombs delete b ;generates player ship explosion images once alien bombs hit player ship DrawImage img_bulletbombdeath,x,y ;checks to see if alien bombs passes 600 y coordinate ElseIf bombs\y > 600 Then ;deletes bombs if alien bombs is greater then 600 y coordinate Delete bombs ElseIf bullet\y < 0 Then ;deletes bullets if bullets is less then 0 y coordinate delete b EndIf Next I get a object does not exist even it is? Help, Thanks |
| ||
| Very hard to read that code without proper formatting and in a codebox but it looks like you are still referring to the "bombs" instance after you delete it....the type instance will be null after you delete it - and it won't exist anymore so checking its "y" value after deleting it is the wrong way to go about it. |
| ||
| Hi Matty, I'll relook at the code again to try and figure it out. sorry about the layout of the code. I tried to fix it but the textarea was acting funny when I was posting it at the time. will let you know if I figure it out. I think I have a idea why its not working. But started on anothe project. The Space Invaders like game, the above code was my first game I created and I get everything working except I wanted to add the bullet to bombs imagescollide. Thanks for the reply. iaqsuk |
| ||
| Hi Matty, and everyone else. I finally figured out the bullets to alien bombs collision: here's the code: ;update bullets and draw them, also deletes bullets with alien bullets if collides For b.bullet = Each bullet b\y = b\y - 5 DrawImage img_bullet,b\x,b\y For ab.abullet = Each abullet ab\y = ab\y + 4 DrawImage img_abullet,ab\x,ab\y If ImagesCollide(img_bullet,b\x,b\y,0,img_abullet,ab\x,ab\y,0) Then DrawImage img_bulletabulletd,x,y PlaySound(snd_bulletabullet) Delete ab Delete b EndIf Next Next did the trick. just added the imagescollide from the original update b.bullet = each bullets. Very glad it worked. done with this game, now gonna work on another game. Good Luck all. iaqsuk |
   |