Drawing a triangle

Richard

I am trying to draw a triangle pointing in a specific direction based on a variable using the following code:

direction = 0
If direction == 0 then
   Front = {50,50}
   Back1 = {30,100}
   Back2 = {30,100}
Else
   Front = {50,150}
   Back1 = {30,100}
   Back2 = {70,100}
Endif
Triangle (Front, Back1,Back2,red,false)
Update()
Sleep(2)

It returns the following error

Line 11
Function triangle
Variable does not exist: front

I believe front is defined one way or another in the if statement and I can't see how the variable does not exist. So I must be doing something wrong, but I can't work out what.

Any help will be greatly appreciated.

Nisse5

"Front" is defined as a local variable within the block. When the execution reach "Endif", the scope of the variable doesn't exists anymore.

You can put a "Front={0,0}" before the if statement will fix it.

sys64738

Can paste the triangle line into the if and else also so it has access to those variables, or make all the variables global like Nisse said.

I was thinking about making vector version of the asteroids game but making the triangle ship face any direction seemed like that most difficult bit, I am sure there is some math equation for it though.

Richard

Thanks, that sounds like it'll work, I will test it later. I knew variables defined within a function were local, but didn't realise it applied to an if statement too. It explains another problem I had come across where I had to pass what I thought was a global variable into a function to use it, it must have been locally defined within an if statement.
Thanks a lot.

Richard

@sys64738 the equation for pointing any direction based on a mid point x,y and an angle from straight up would be:

point = []
for i = 0 to 3 loop
   point[i]= {x + (length*sin(angle+(120*i))),y - (length*cos(angle+(120*i)))}
repeat
triangle (point[0],point[1],point[2],white,true)

Or at least something very similar.