One mouse click, but the statement in if runs multiple times

Fei

Hello,

I am learning processing 3 to control LED via bluetooth on Arduino. On the canvas, there are 2 buttons, one is "Turn ON", another is "Turn OFF", with below code,

      // If the button "Turn ON" is pressed
      if(mousePressed && mouseX>50 && mouseX<200 && mouseY>100 && mouseY<150){
        //myPort.write('1'); // Sends the character '1' and that will turn on the LED
        i++;
       myPort.write(i);
        // Highlighs the buttons in red color when pressed
        stroke(255,0,0);
        strokeWeight(2);
        noFill();
        rect(50, 100, 150, 50, 10);
      }

every click, line " myPort.write(i);" was repeated different times, below is output from Arduino

First Click

    123
    456
    789
    10

Second Click

    1112
    13141516

What I wanna achieve is as below:

First Click

1

Second Click

2

Your help is highly appreciated.

Fei

TfGuy44

Use mousePressed(), the function, not mousePressed, the boolean.

The conditional statement that looks at the boolean will get checked each time draw runs, which is about 60 times a second, and a click lasts for longer than that.

The function, however, will only run once per click.

 // ...
} // End of draw()

void mousePressed(){
  if( mouse_over_button_conditions ){
    // actions to take once per click
  }
}

kfrajer

Your sketch is running at 30fps. MousePressed is issued as long as your key is pressed. If you pressed it for 1 seconds, you should multiple outputs, exactly as you reported. Instead of mousePressed within draw, use mouseRelesed() like this:

void setup(){}

void draw(){}

void mouseReleased(){
}

More at https://processing.org/reference/mouseReleased_.html

Kf

Fei

Thanks for your great help, @ kfrajer and TfGuy44

Now it is under my control. :-)