+ SketcherConfig &config = gui->plugin->config;
+ SketcherCurves &curves = config.curves;
+ int ci = gui->plugin->cv_selected;
+ if( ci < 0 || ci >= curves.size() )
+ return -1;
+ SketcherCurve *cv = curves[ci];
+ SketcherPoints &points = cv->points;
+ int pi = gui->plugin->pt_selected;
+ if( pi < 0 || pi >= points.size() )
+ return -1;