| #define SETLINEJOIN 22 |
| short Control(lpDevice, SETLINEJOIN, lpInData, lpOutData) | |||
| LPPDEVICE lpDevice; | |||
| LPWORD lpInData; | |||
| LPWORD lpOutData; |
The SETLINEJOIN escape specifies how to join two lines that meet at an angle.
lpDevice
Points to a PDEVICE structure specifying the destination device.
lpInData
Points to a 16-bit variable that specifies the newline join type. If this parameter is NULL, the escape does not change the line join. The variable can contain one of the following values.
| Value | Meaning |
| 0 | Miter join. The outer edges of the strokes for the two segments are extended until they meet at an angle, as in a picture frame. If the segments meet at too sharp of an angle, a bevel join is used instead; this is controlled by the miter limit established by the SETMITERLIMIT escape. |
| 1 | Round join. A circular arc with a diameter equal to the line width is drawn around the point where the segments meet, and is filled in, producing a rounded corner. The stroke actually draws a full circle at this point. If path segments shorter than one-half the line width meet at sharp angles, an unintentional “wrong side” of this circle may appear. |
| 2 | Bevel join. The meeting path segments are finished with butt-end caps (same as set by the SETLINECAP escape); then, the resulting notch beyond the ends of the segments is filled with a triangle. |
lpOutData
Points to a 16-bit variable that receives the previous line-join type. If this parameter is NULL, the escape does not return the previous line-join type.
The return value is TRUE if the escape is successful. Otherwise, it is FALSE.
Join styles are significant only at points at which consecutive segments of a path connect at an angle. Curved lines are actually rendered as sequences of straight line segments, and the current line join is applied to the “corners” between those segments. However, for typical values of the flatness parameter, the corners are so shallow that the difference between join styles is not visible.