ACE3/addons/maptools/functions/fnc_handleKeyDown.sqf

/*
 * Author: esteldunedain
 * Handle key down on map.
 *
 * Arguments:
 * 0: Display (display)
 * 1: Key code (number)
 * 2: Shift Key (boolean)
 * 3: Ctrl Key (boolean)
 * 4: Alt Key (boolean)
 *
 * Return value:
 * Boolean, true if event was handled
 */

#include "script_component.hpp"

PARAMS_5(_display,_code,_shiftKey,_ctrlKey,_altKey);

private ["_handled", "_relPos", "_diffVector", "_magDiffVector", "_lambdaLong", "_lambdaTrasAbs"];

_handled   = false;

#define DIK_ESCAPE          0x01
#define DIK_DELETE          0xD3

// If pressed Esc while drawing
if (_code == DIK_ESCAPE) exitWith {
    if (GVAR(drawing_isDrawing)) then {
        call FUNC(cancelDrawing);
        _handled = true;
    };
};

if (_code == DIK_DELETE) exitWith {
    if (GVAR(drawing_isDrawing)) then {
        call FUNC(cancelDrawing);
        _handled = true;
    } else {

        // Check if a line marker needs to be deleted
        {
            _relPos = GVAR(mousePosition) vectorDiff (_x select 1);
            _diffVector = (_x select 2) vectorDiff (_x select 1);
            _magDiffVector = vectorMagnitude _diffVector;
            if (_magDiffVector == 0) then {
                _diffVector = [10,0,0];
                _magDiffVector = vectorMagnitude _diffVector;
            };
            _diffVector = _diffVector vectorMultiply (1/_magDiffVector);

            // Projection of the relative position over the longitudinal axis
            _lambdaLong = _diffVector vectorDotProduct _relPos;
            // Projection of the relative position over the trasversal axis
            _lambdaTrasAbs = vectorMagnitude (_relPos vectorDiff (_diffVector vectorMultiply _lambdaLong));
            if (_lambdaLong >= 0 && _lambdaLong <= _magDiffVector && _lambdaTrasAbs <= 5) exitWith {
                // Delete the line marker
                if (GVAR(drawing_syncMarkers)) then {
                    ["drawing_removeLineMarker", [_x select 0]] call EFUNC(common,globalEvent);
                } else {
                    deleteMarkerLocal (_x select 0);
                    GVAR(drawing_lineMarkers) = GVAR(drawing_lineMarkers) - [_x];
                };
                _handled = true;
            };
        } forEach GVAR(drawing_lineMarkers);
    };
};

_handled