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    How do I find and remove objects in an array?

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    • d.healeyD
      d.healey @VirtualVirgin
      last edited by d.healey

      @VirtualVirgin said in How do I find and remove objects in an array?:

      I'm working on a primitive piano roll

      Have you seen the built in piano roll with the MIDI player? I think it might just be a viewer, I haven't played around with it. Lots of docs though.

      a5d3382a-c6d3-438d-9f75-0be155eaf75d-image.png

      Libre Wave - Freedom respecting instruments and effects
      My Patreon - HISE tutorials
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      • VirtualVirginV
        VirtualVirgin @d.healey
        last edited by

        @d-healey I did take a look at it, but I don't see any way to edit the notes from the viewer. I just think it outputs the graphics from a MIDI file, so I though it was just as well if I try to build my own.

        You can listen to my orchestral mockups here:
        https://www.virtualvirgin.net/

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        • d.healeyD
          d.healey @VirtualVirgin
          last edited by

          @VirtualVirgin Yeah I think you're right about the viewer. But you can use the player as the backend to manage the tracks, notes, etc. and build your own UI to display and edit.

          Libre Wave - Freedom respecting instruments and effects
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          • d.healeyD
            d.healey
            last edited by

            For the original problem you might be able to make use of some of the fancier array functions like map, filter, find, some, etc. Or just use a good ol' fashioned loop to manually search the array for the object you're interested in.

            Libre Wave - Freedom respecting instruments and effects
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            • VirtualVirginV
              VirtualVirgin @d.healey
              last edited by

              @d-healey said in How do I find and remove objects in an array?:

              For the original problem you might be able to make use of some of the fancier array functions like map, filter, find, some, etc. Or just use a good ol' fashioned loop to manually search the array for the object you're interested in.

              I am using filter and map in this script, but I am new to them so I may not be using them correctly.

              My trouble at the moment is detecting which notes are selected

              "selectedNotes" is an array that is getting populated properly to tell me which noteCells are selected,
              but then I run this inline function to check and this only works somethimes:

              // check for selected notes
              inline function isSelected(cell)
              {
              	local sRow = selectedNotes.some(obj => obj.row === cell.row);
              	local sCol = selectedNotes.some(obj => obj.col === cell.col);
              	if (sRow && sCol)
              		return true;
              	else
              		return false;
              };
              

              I am trying to use that like "array.contains()", but in this case for specific objects ("cell").
              The "cell" is an object with the coordinates i.e. {"row" : 60, "col" : 4}
              This works when I use click or shift click to select my notes, but not when a drag selection has been made. Not sure why as they both populate the selectedNotes array.

              You can listen to my orchestral mockups here:
              https://www.virtualvirgin.net/

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              • d.healeyD
                d.healey @VirtualVirgin
                last edited by d.healey

                @VirtualVirgin For those functions (some, filter, etc.) the first parameter should be a function.

                8ecde93d-8e0d-4864-9392-6862b29b2606-image.png

                Edit: I just realised you're doing the javascript arrow function thing, we don't have that in HISE.

                Libre Wave - Freedom respecting instruments and effects
                My Patreon - HISE tutorials
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                • VirtualVirginV
                  VirtualVirgin @d.healey
                  last edited by

                  @d-healey said in How do I find and remove objects in an array?:

                  @VirtualVirgin For those functions (some, filter, etc.) the first parameter should be a function.

                  8ecde93d-8e0d-4864-9392-6862b29b2606-image.png

                  Edit: I just realised you're doing the javascript arrow function thing, we don't have that in HISE.

                  No, the arrow function definitely works:

                  Screenshot 2025-01-28 at 5.00.15 PM.png

                  You can listen to my orchestral mockups here:
                  https://www.virtualvirgin.net/

                  d.healeyD 1 Reply Last reply Reply Quote 1
                  • d.healeyD
                    d.healey @VirtualVirgin
                    last edited by d.healey

                    @VirtualVirgin

                    Oh that's good to know, thanks!

                    Now I can do this kind of thing:

                    Engine.showYesNoWindow("A title", "Some text", response => {
                    	Console.print(response);
                    });
                    

                    You could replace this

                    	if (sRow && sCol)
                    		return true;
                    	else
                    		return false;
                    

                    With return sRow && sCol

                    But this doesn't solve your issue. Can you make a simple snippet that demonstrates the issue?

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                    • VirtualVirginV
                      VirtualVirgin @d.healey
                      last edited by VirtualVirgin

                      @d-healey
                      I found where the problem is taking place:

                                  selectedNotes.push
                                  (
                      	            selectedNotes.filter(function (c) 
                      	            {
                      	                var cx = c.col * cellWidth;
                      	                var cy = height - (c.row + 1) * cellHeight;
                      	
                      	                return 
                      	                (
                      	                    cx + cellWidth > x1 &&
                      	                    cx < x2 &&
                      	                    cy + cellHeight > y1 &&
                      	                    cy < y2
                      	                );
                      	            })
                                  );
                      

                      This selectedNotes.push is pushing an object inside an array to the selectedNotes array, whereas I only need it to push an object to the array.
                      So the current result is looking like [[{"row":42, "col":4}]]
                      but I need it to just look like [{"row":42, "col":4}]
                      I am not sure how I modify that to just use a the object and not have it wrapped in that extra array.

                      You can listen to my orchestral mockups here:
                      https://www.virtualvirgin.net/

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                      • d.healeyD
                        d.healey @VirtualVirgin
                        last edited by

                        @VirtualVirgin Add [0] after the parenthesis e090f3a3-5ac8-4143-bc41-ba907ae5f7c9-image.png

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                        • VirtualVirginV
                          VirtualVirgin @d.healey
                          last edited by

                          @d-healey Almost...
                          that turns it into an object, but it only returns one selection to the list instead of all of the noteCells under the selection rectangle area.
                          Without the [0] it returns all of them, but inside an array.

                          You can listen to my orchestral mockups here:
                          https://www.virtualvirgin.net/

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                          • d.healeyD
                            d.healey @VirtualVirgin
                            last edited by

                            @VirtualVirgin In that case after it returns them, just grab the [0] element from that array.

                            Libre Wave - Freedom respecting instruments and effects
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                            • VirtualVirginV
                              VirtualVirgin @d.healey
                              last edited by

                              @d-healey Whoops... is there a panic button of some sort for feedback loops? I got stuck in one.

                              You can listen to my orchestral mockups here:
                              https://www.virtualvirgin.net/

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                              • d.healeyD
                                d.healey @VirtualVirgin
                                last edited by

                                @VirtualVirgin What do you mean?

                                Libre Wave - Freedom respecting instruments and effects
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                                • VirtualVirginV
                                  VirtualVirgin @d.healey
                                  last edited by

                                  @d-healey I added a for loop after that function and it seems to be stuck in the loop

                                  You can listen to my orchestral mockups here:
                                  https://www.virtualvirgin.net/

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                                  • d.healeyD
                                    d.healey @VirtualVirgin
                                    last edited by

                                    @VirtualVirgin What does the loop do?

                                    Libre Wave - Freedom respecting instruments and effects
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                                    • VirtualVirginV
                                      VirtualVirgin @d.healey
                                      last edited by

                                      @d-healey

                                      for (i = 0; i < noteCells; i++)
                                           selectedNotes.push(noteCells[i]);
                                      

                                      It's not resolving because I meant to use "i < noteCells.length",
                                      so I am stuck with a spinning wheel and a sluggish HISE.

                                      I'll just force quit it.
                                      Just didn't know if there is a button similar to "all notes off" to stop the processing.

                                      You can listen to my orchestral mockups here:
                                      https://www.virtualvirgin.net/

                                      d.healeyD 1 Reply Last reply Reply Quote 0
                                      • d.healeyD
                                        d.healey @VirtualVirgin
                                        last edited by

                                        @VirtualVirgin Can you just hit compile again?

                                        Libre Wave - Freedom respecting instruments and effects
                                        My Patreon - HISE tutorials
                                        YouTube Channel - Public HISE tutorials

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