pixel-editor/js/_changeTool.js

function changeTool (selectedTool) {
    // Ending any selection in progress
    if (currentTool.includes('select') && !selectedTool.includes('select') && !selectionCanceled) {
        endSelection();
    }
    //set tool and temp tje tje tpp;
    currentTool = selectedTool;
    currentToolTemp = selectedTool;

    var tools = document.getElementById('tools-menu').children;

    for (var i = 0; i < tools.length; i++) {
        tools[i].classList.remove('selected');
    }

    //give the button of the selected tool the .selected class
    document.getElementById(selectedTool+'-button').parentNode.classList.add('selected');

    //change cursor
    updateCursor();
}