question about controlling RC car with X,Y coordinates in a if() function

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reaperiso..

question about controlling RC car with X,Y coordinates in a if() function

in Programming Questions • 1 year ago

im trying to control a rc car like this

touchOSC (app on ipod) -> processing -> arduino -> controller -> RC car

however we want to use a 200x200 X,Y interface on touchOSC to control the RC car.

my only problem right now is the coding in processing, i want it to do the following

if (x>50 && y<50), the RC car should go left

if (x<150 && y<50), the RC car should go right

im not sure how to program this because im using an example as reference.

---------------------------------------------------------

// when OSC packets are received

void oscEvent(OscMessage theOscMessage) {

// set the current address to the control name

String addr = theOscMessage.addrPattern();

// get the value of the control

float val = theOscMessage.get(0).floatValue();

// if the control toggled is toggle1, then toggle float value

if(addr.equals("/1/xy1")) { v_toggle1 = val; }

-------------------------------------------------------------

however this example makes use of buttons and i want it to work with x,y coordinates instead.

my friend tells me i cant replace addr with the x,y coordinates...so i don't really know how to continue from here.

Could someone help me with this?

Replies(4)

maleo

Re: question about controlling RC car with X,Y coordinates in a if() function

1 year ago

when using an xy-control in touchOSC you can get the x and y values this way:

void oscEvent(OscMessage msg) {
if (msg.addrPattern().equals("/1/xy1")) {
float fx = msg.get(1).floatValue();
float fy = msg.get(0).floatValue();
}
}

fx and fy might be swapped, depending on the orientation of your iDevice.

reaperiso..

Re: question about controlling RC car with X,Y coordinates in a if() function

1 year ago

thanks for the quick response mate.Now i can get the X,Y data from touchOSC, but how do i tell processing to ONLY activate a switch under the condition: if (x>50 && y<50)

in the example they used:

// if the control toggled is toggle1, then toggle float value

if(addr.equals("/1/toggle1")) { v_toggle1 = val; }

(sorry in the previous example i used xy1, but this was actually an edit from me, not from the original example)

maleo

Re: question about controlling RC car with X,Y coordinates in a if() function

1 year ago

well just like you wrote (see line 6):

void oscEvent(OscMessage msg) {
if (msg.addrPattern().equals("/1/xy1")) {
float fx = msg.get(1).floatValue();
float fy = msg.get(0).floatValue();
if (fx > 50 && fy < 50) {
// do something
}
}
}

i believe the standard range for x/y values in touchOSC is 0..1 though. but you can easily change that in touchOSC or use processings map() function. http://processing.org/reference/map_.html

PhiLho

Re: question about controlling RC car with X,Y coordinates in a if() function

1 year ago

Note that if () is not a function (that's why I prefer to put a space after the keyword) but a control statement.

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