一旦创建了画布部件实例，其上就可以创建一些标准的图形对象(例如，直线、圆形、长方形等)。
Once a Canvas widget has been instantiated, several standard graphical objects (such as lines, circles, rectangles, and others) can be created on it. The following program demonstrates this.
玉片呈长方形正方形三角形梯形多边形等。
The jade one presents rectangle, square, triangular, ladder - shaped, polygonal etc.
门簪有方形、长方形、菱形、六角形、八角形等样式。
The gate hairpin comes in the shapes of squares, rectangles, diamonds, hexagons, octagons, and etc.
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