TheGameCreators - CodeBase - A Line moving left and right in a visible area

Category: 2D

Version: 1.0

Information

Uploaded: 15th Feb 2009 11:34

Modified: 1st Jan 1970 01:00

Author: Alduce

Summary

You can use left and right keys to move the line in the visible area.When a portion of this line pass the left or righ edge, this portion disappear.

Full Description

DarkBASIC Professional Source Code

` This code was downloaded from The Game Creators

` It is reproduced here with full permission

` http://www.thegamecreators.com

SET DISPLAY MODE 1152, 864, 16

set window off

sync on

sync rate 100

backdrop off

rem MAIN LINE COORDS

mul as float

mul2 as float

start_x as float

start_x = 130

start_y as float

start_y = 400

end_x as float

end_x = 420

end_y as float

end_y = 600

barrier_x = 100

barrier_x2 = 500

`----------------------------------------------------------------------------

`----------------------------------MAIN LOOP---------------------------

`----------------------------------------------------------------------------

cls

gosub DrawBar2

gosub testi

sync

loop

`----------------------------------------------------------------------------

`--------------------------------MAIN LOOP END------------------------

`----------------------------------------------------------------------------

DrawBar2:

line 100,307,500,307

line 100,684,500,684

line 100,307,100,684 rem left barrier

line 500,307,500,684 rem right barrier

if rightkey()=1

start_x = start_x - 2

end_x = end_x - 2

endif

if leftkey()=1

start_x = start_x + 2

end_x = end_x + 2

endif

rem LEFT BARRIER

if start_x > barrier_x and end_x < barrier_x2

line start_x,start_y,end_x,end_y

endif

if start_x <= barrier_x

if end_x > barrier_x

mul =(end_x-barrier_x)/(end_x-start_x)

new_start_y = end_y - ( (end_y-start_y) * mul )

line barrier_x,new_start_y,end_x,end_y

endif

rem RIGHT BARRIER

if end_x < barrier_x2 and  start_x > barrier_x

line start_x,start_y,end_x,end_y

endif

if end_x > barrier_x2

if start_x < barrier_x2

mul2 =(start_x-barrier_x2)/(start_x-end_x)

new_end_y = start_y - ( (start_y-end_y) * mul2 )

line start_x,start_y,barrier_x2,new_end_y

endif

return

rem *************************** TEXT*********************************

testi:

ink rgb(255,255,255),0

set cursor 10,10

print "start_x = ";start_x

set cursor 10,20

print "start_y = ";start_y

set cursor 10,40

print "end_x = ";end_x

set cursor 10,50

print "end_y = ";end_y

set cursor 10,80

print "NEW_START_Y = ";new_start_y

set cursor 10,100

print "MUL = ";mul

set cursor 10,110

print "MUL2 = ";mul2

set cursor 300,10

print "MOUSE X = ";mousex()

set cursor 300,20

print "MOUSE Y = ";mousey()

return

rem *************************** END TEXT ****************************

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Author Name:	Alduce
CodeBase Entries:	2

CodeBase - A Line moving left and right in a visible area

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DarkBASIC Professional Source Code

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