Function useCanvas

docs/app/js/sanddance-app.js:122843–122845

(use)

};
useCanvas(true);
function useCanvas(use) {
    textMetrics.width = use && context ? measureWidth : estimateWidth;
} // make simple estimate if no canvas is available
function estimateWidth(item, text1) {
    return _estimateWidth(textValue(item, text1), fontSize(item));
}