Drawing Basic Shapes：画基本图形

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There are two ways to draw basic shapes like lines and rectangles.

The first is to use specific drawing methods like

Graphics.drawOval(). This example uses these methods. The

second is to construct a shape and then use Graphics2D.draw() to

draw the shape. See the java.awt.geom package for examples that

create shapes.

g2d.drawLine(x1, y1, x2, y2);

g2d.drawArc(x, y, w, h, startAngle, arcAngle);

g2d.drawOval(x, y, w, h);

g2d.drawRect(x, y, w, h);

g2d.drawRoundRect(x, y, w, h, arcWidth, arcHeight);

Polygon polygon = new Polygon();

polygon.addPoint(x, y);

// ...continue adding points

g2d.drawPolygon(polygon);