The GetMapImpactY function returns the Y position after a collision has been detected from the CheckMapImpact command.
FACTS:
* None
Mini Tutorial:
This example builds map, and level. The primary focus of this example is the detection of collisions of moving region and the level.
; Create a map with provision for 5 levels
MyMap=NewMap(5)
; Create some blank blocks for this map
CreateMapGFX MyMap,25,25,2,RGB(0,0,0)
BoxC 0,0,30,30,1,RGB(255,0,200)
GetMapBlk MyMap,1,0,0
; create the level
MyLevel=NewLevel(Mymap,25,20)
w=GetLevelWidth(MyMap,MyLevel)
h=GetLevelHeight(MyMap,MyLevel)
; Fill the Level edges with blocks
For Xlp=0 To GetLevelWidth(MyMap,mylevel)
PokeLevelTile Mymap,MyLevel,xlp,0,1
PokeLevelTile Mymap,MyLevel,xlp,h,1
Next
For Ylp=0 To GetLevelHeight(MyMap,mylevel)
PokeLevelTile Mymap,MyLevel,0,ylp,1
PokeLevelTile Mymap,MyLevel,w,ylp,1
Next
; Draw a strip of blocks across the middle
; of the page
For Xlp=3 To GetLevelWidth(MyMap,mylevel)-3
PokeLevelTile Mymap,MyLevel,xlp,h/2,1
Next
; Define some variables for a PLayer
PlayerX=50
PlayerY=50
PlayerWidth =20
PlayerHeight =20
Speed=4
; Start a Do / Loop
Do
; Clear the screen
Cls RGB(0,0,0)
; Draw the map to the screen
DrawMap MyMap,MyLevel,0,0
; Store the players possible new position
PlayerNewX=PlayerX
PlayerNewY=PlayerY
; Handle the players Movement
If UpKey() Then PlayerNewY=PLayerY-Speed
If DownKey() Then PlayerNewY=PLayerY+Speed
If LeftKey() Then PlayerNewX=PLayerX-Speed
If RightKey() Then PlayerNewX=PLayerX+Speed
; ==========================
; Handle Collision
; ===========================
If CheckMapImpact(MyMap,MyLevel,PlayerX,playerY,PlayerNewX,PlayerNewY,PLayerWidth,PlayerHeight)
; If there was impact with the map, then read our
; new position back.
PlayerX=GetMapImpactX()
PlayerY=GetMapImpactY()
; Check what side the impact occured upon
; and display a message
If GetMapImpactLeft()
Print "Impact occured on the LEFT side"
EndIf
If GetMapImpactRight()
Print "Impact occured on the RIGHT side"
EndIf
If GetMapImpactTop()
Print "Impact occured on the TOP side"
EndIf
If GetMapImpactBot()
Print "Impact occured on the Bottom side"
EndIf
Else
; No Collision, Then set the current players
; position to it's new position
PlayerX=PlayerNewX
PlayerY=PlayerNewY
EndIf
; draw the player (box) to the screen
X2=playerX+PlayerWidth
Y2=playerY+PlayerHeight
Box playerX,playerY,x2,y2,1
; Display the screen
Sync
; Loop back to the do statement
Loop
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This example would output.
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