GC drawing conditions: drawing can be performed on any class that implements the drawable interface.

Use SWT to draw 2D images

SWT plotting is usually done in two ways: graphics context and draw2d. However, draw2d is a lightweight component based on SWT composite,
Therefore, in terms of efficiency, it cannot reflect the speed advantage of SWT's native code. Therefore, although it is powerful, it is only applicable to applications where drawing is not a system bottleneck.Program. So here I will only introduce the first method.

GC: graphics context

We can draw graphics on any class that implements the org. Eclipse. SWT. Graphics. drawable interface. This includes a control, an image, a display device, or a printing device. Class org. Eclipse. SWT. Graphics. GC is a graphical context that encapsulates all executable drawing operations ).