1. The clipping region top-left point X-coordinate.

2. Then it moves the graphics cursor to an x-coordinate of 0 (the left edge) and the supplied y coordinate, and shows the given text string.

3. Optional X-coordinate of the top-left corner of the texture region to lock.

4. The paper introduces the thinking and steps of drawing the curvilinear, at the same time presents in detail the program of protracting x-coordinate and the skills of ruler labelling.

5. It also adds the value of originX, which specifies the x-coordinate of the left-most point in the graph.

6. But the quadratic curve can be used only in condition when each X-coordinate of the points sequence mapping to only one Y-coordinate, so it can't be used in fitting closing curve.

7. Based on the screw theory, the first-order effect coefficient matrixes of a 3-UPU parallel pyramid mechanism under initial position and movement along X-coordinate axis are established.

8. Pointer to a float tos tore the mouse cursor X-coordinate to.