1. Let's assume that this graph is a trapezoid. First click on the picture, and six black control points will appear on the picture.

2. Hold down the Ctrl key and place the mouse on the black dot in the middle of the top. At this time, the mouse will become a two-way direction key. Pull the picture down to form a vertical flip of the character. If it turns to the right, it forms a horizontal flip. Similarly, the same is true for the upper left.