Mouse x y coordinates (ControlP5)

Processing Libraries
1

Thank you for reading this. The following is a summary of the current code.

I have an array of circles that represent LEDs.

I have radio buttons, using the P5 library, to select a colour.

What I’d like to do is click on an LED to select it. From there I can change its status (whether it’s off or on), its on colour or its off colour.

I know the x and y position of the centre of the LEDs and I know its diameter and to avoid calculating the range of x and y values every time a LED is clicked on I could created a look-up table for each LED.

This might be OK for an array of 8 LEDs but it will soon get out of hand if I use the same idea for say 64 LEDS.

What I have created so far seems a bit clumsy. Is there a better way?

I wrote this yesterday and in the meantime I had an idea. I could create an array of P5 buttons instead of LEDs. That would mean, as far as I know, that I would then need a function for each button. Also, how do I create a button without a label?

2

Yes set the x y coordinates in an array and use something like code below…
For a radio button without label, just leave the string empty, like .addItem("",1)

void mousePressed() {
  for (int i = 0; i < 3; i++) {
    if (mouseX > bx_val[i] && mouseX < bx_val[i] +button_width && mouseY > bys && mouseY < bys+button_height) {
      switch(i) {
      case 0:
        if conditional;
        break;
      case 1:
        if conditional;
        break;
      case 2:
         if conditional;
        break;
      }
    }
  }
3

Thank noel you for your reply.

I was thinking that a long switch / case statement would be untidy but so be it.

Also , thank you for your .addItem() answer, I couldn’t see beyond something like the following:

cp.addRadioButton("radioButton")

void raioButton(int b)
4

when you have the index of the button you can use the index maybe as an index for your LEDs array

6

Thank you Chrisir,

I’ve made some headway with mouse x y idea. However, as you say, a button index would would select an LED without any calculation. I’ll experiment.

7

For example when the leds are in a array you can convert mouse position to index

Like with division or modulo

Similar problem:

Getting the color of a single pixel with get(x, y) is easy, but not as fast as grabbing the data directly from pixels[] . The equivalent statement to get(x, y) using pixels[] is pixels[y*width+x] .

8

Thank you again, Chrisir.

I have used get(x,y) to rotate colours through an array of LEDs based on knowing the colour of the pixel at the centre of the LED. I had seen the reference to pixels[] but haven’t tried it. I will have a think about your suggestion regarding mouse position to array index.

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