double transXs = transX0 + (getStepPoint()
                            * (transX1 - transX0));
                    drawLine(g2, state.workingLine, transX0, transY0, transXs,
                            transY0);
                    drawLine(g2, state.workingLine, transXs, transY0, transXs,
                            transY1);
                    drawLine(g2, state.workingLine, transXs, transY1, transX1,
                            transY1);