Simple Ramp Up. Am I Being Stupid?

[djmikeys]

Am I being stupid here?
All I want is to have a function that coresponds to the following graph:

The straight line cuts the axis at (0,140) and then carries on up to (150,200). Once the straight line has reached this upper point of (150,200) it then stays x value then stays at 200. I've attached a quick sketch of the graph.

Here is the equation I was using, the first bit is correct and works fine but when I add the function to cap the value at 200 it gets confused:
--------------------------
b3 = b1 * 60/150 + 140 'this bit is correct
if b3 =>199 then goto max1 ' this bit confuses things

max1:
b3 = 200
pause 50
------------------------

Any suggestions? I I just being stupid?

 

[eclectic]

Mshorter.

Try this, on the Simulator or for real.

for b1 = 0 to 255

b3 = b1 * 60/150 + 140 'this bit is correct
if b3 >199 then
b3 = 200
endif

sertxd(#b1," ",#b3,cr,lf)
next

 

[BeanieBots]

There is also the max/min operators to consider.
eg
b3 = b1 * 60/150 + 140 MAX 200

 

[djmikeys]

Got it sorted,

b3 = b1 * 60/150 + 140 'this bit is correct
if b3 >199 then
b3 = 200
endif


seems to work fine,

cheers for the help,
Mike

 

[westaust55]

Lines and circles

Hi Mark,

Great to see that you have solved the problem.

For furture reference, I posted formula for lines and circle a couple of months back.
Have a look at post 12 in this thread:
http://www.picaxeforum.co.uk/showthread.php?t=9904&highlight=Line+Circle&page=2

These form the basis of the calcs I did for drawing lines and circle on a gLCD ex mobile phones.

 

[hippy]

@ Mike : Do check out BeanieBot's suggestion of MAX ( and MIN ). That also does what you want, takes up less code space and is faster to execute.