Here's some code. It's my waypoint editor, modified. Click the mouse to put down waypoints. Then press the space bar to get the enemy (Big square) to smoothly (sorta) follow. Press Return to reset, and space bar to play again. You can add waypoints anytime you wish :)
Graphics 800,600
SetBuffer BackBuffer()
Global max_path_points=100
Dim pathx#(max_path_points-1); set up 101 path points
Dim pathy#(max_path_points-1); -1 because arrays start at zero
Global path_counter=-1
Global current_path=0
Global cx#=0
Global cy#=0
Global ex#=400
Global ey#=100
Global movement_started=0
While Not KeyHit(1)
Cls
If MouseHit(1) Then
setpath(MouseX(),MouseY()); set path point with the mouses current coords
End If
If KeyHit(57) And movement_started=0 And path_counter>0 Then; if spacebar pressed then move rectangle
current_path=0; reset the current path to 0
cx=pathx(0); set the rectangles coords to the first path point
cy=pathy(0)
movement_started=1; set flag for movement started
ex=400
ey=100
End If
If KeyHit(28) Then; if the enter key is pressed then stop movement
movement_started=0; clear flag for movement
cx=pathx(0); set rectangle coords to the first path point
cy=pathy(0)
current_path=-1; set current path to none exsistant
End If
draw_path_points(); function for drawing the pathpoints
If movement_started=1 Then move(); draw the moving rectangle and move it
Color 200,200,200; set drawing color
Rect MouseX()-1,MouseY()-1,2,2; draw mouse location with a rectangle
Text 0,0,"Click mouse to set path point. Press spacebar to start animation. Press enter to stop."
Text 0,10,"movement started="+movement_started
Flip
Wend
End
Function move()
ang#=0
If current_path<path_counter Then; make sure the current path point is less than the highest
ang=ATan2(pathy(current_path+1)-pathy(current_path),pathx(current_path+1)-pathx(current_path))
;/\ basically means find the angle between the current path point and the next one /\
cx=cx+Cos(ang)*3; increase the x coord of the rect following the path points based on the angle
cy=cy+Sin(ang)*3; increase the y coord of the rect following the path points based on the angle
Color 100,200,100; change drawing color
Rect cx-3,cy-3,6,6; draw the rectangle central to it's coords
If Abs(cx-pathx(current_path+1))<2 And Abs(cy-pathy(current_path+1))<2 Then
; /\ if the rects coords are with a 1 pixel distance of the path point then /\
current_path=current_path+1; increase the current path point number
cx=pathx(current_path); set the rectangles coords to that of the next path point
cy=pathy(current_path)
End If
End If
angle=ATan2( cy - ey, cx - ex ); find the angl between the enemies and the waypoint follower
dist=Sqr( (ex-cx)*(ex-cx)+(ey-cy)*(ey-cy) ); find the distance between them
DebugLog dist
ex=ex+(Cos(angle)/1)*(dist/30); move the enemy at speed relative to the distance
ey=ey+(Sin(angle)/1)*(dist/30); move the enemy at speed relative to the distance
Rect ex-15,ey-15,30,30; draw the enemy
End Function
Function setpath(x,y)
path_counter=path_counter+1; increase counter
If path_counter>max_path_points-1 Then; if counter is higher than the available number of path points then set it back
path_counter=max_path_points-1
Else; else
pathx(path_counter)=x; record the x and y positions
pathy(path_counter)=y
End If
End Function
Function draw_path_points()
For loop=0 To path_counter; loop through all the path points
Color 100,100,200
Rect pathx(loop),pathy(loop),2,2
If loop<path_counter Then; do this loop while the loop value is less than the highest path value
Rect pathx(loop+1)-1,pathy(loop+1)-1,2,2; draw a rectangle at the path point so its central
Color 50,50,150; change drawing color
Line pathx(loop),pathy(loop),pathx(loop+1),pathy(loop+1); draw a line between the current point and the next one
End If
Next
End Function
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