boundires help
BlitzMax Forums/BlitzMax Beginners Area/boundires help
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| tryin to make the ball bounce of the paddles and walls and go in a random direction as long as it is in bounds.. thats where i need help . my bounds checking dos'nt seem to work.. help (replace media with your own) Type player Field image:TImage Field x# Field y# Field speed End Type Type ball Field image:TImage Field x# Field y# Field speed Field dir End Type Global PList:TList= CreateList() Global BList:TList= CreateList() Graphics 400,400,0,60 SeedRnd MilliSecs() SetMaskColor 0,0,0 Create_Player() Create_Ball() While Not KeyHit(Key_Escape) Update_Player() Update_Ball() Flip Cls Wend Function Create_Player() p:player=New player p.image=LoadImage("paddle1.bmp") p.x=200 p.y=380 p.speed=3 PList.AddLast(p) End Function Function Update_Player() For p:Player= EachIn PList DrawImage(p.image,p.x,p.y) If KeyDown(Key_Left) And p.x>0 Then p.x:-p.speed If KeyDown(Key_Right) And p.x+ImageWidth(p.image)<400 Then p.x:+p.speed Next End Function Function Create_Ball() b:ball=New ball b.image=LoadImage("ball1.bmp") b.x=200 b.y=20 b.speed=2 b.dir=1 BList.AddLast(b) End Function Function Update_Ball() For b:Ball=EachIn BList DrawImage(b.image,b.x,b.y) Select b.dir Case 1 b.x=b.x b.y:+b.speed Case 2 b.x=b.x b.y:-b.speed Case 3 'downright b.x:-b.speed b.y:+b.speed Case 4 'downleft b.x:+b.speed b.y:+b.speed Case 5 'upleft b.x:-b.speed b.y:-b.speed Case 6 'upright b.x:+b.speed b.y:-b.speed End Select For p:player=EachIn PList If ImagesCollide(p.image,p.x,p.y,0,b.image,b.x,b.y,0) b.dir=Rnd(2,6) End If If b.y<=3 b.dir=Rnd(1,6) <-- Bounds check If b.x<=3 b.dir=Rnd(2,6) Help If b.x>=598 b.dir=Rnd(2,6) Next Next End Function |
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| i'd have a x movement and a y movement variable ( x&y speed ) if you hit a horizontal surface xm=-xm if you hit a vertical surface ym=-ym and do x:+xm y:+ym each frame |
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