e586. Drawing Simple Shapes

There are two ways to draw basic shapes like circles, ovals, lines, arcs, squares, rectangles, rounded rectangles, and polygons. 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.

    // See e575 The Quintessential Drawing Program
    public void paint(Graphics g) {
        Graphics2D g2d = (Graphics2D)g;

        g2d.drawLine(x1, y1, x2, y2);
        g2d.drawOval(x, y, w, h);
        g2d.drawRect(x, y, w, h);

        // A start angle of 0 represents a 3 o‘clock position, 90 represents a 12 o‘clock position,
        // and -90 (or 270) represents a 6 o‘clock position
        int startAngle = 45;
        int arcAngle = -60;
        g2d.drawArc(x, y, w, h, startAngle, arcAngle);

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

        Polygon polygon = new Polygon();
        polygon.addPoint(x, y);
        // Add more points...
        g2d.drawPolygon(polygon);
    }

原文地址：https://www.cnblogs.com/borter/p/9596072.html