Drawing in a Window - Beginning Java 2 SDK - page 796

g2D.draw(line);
p1.setLocation(p1.x + width1, p1.y);
p2.setLocation(p2.x + width2, p2.y);
g2D.draw(new Line2D.Float(p1,p2));
p1.setLocation(p1.x, p1.y + height1);
p2.setLocation(p2.x, p2.y + height2);
g2D.draw(new Line2D.Float(p1,p2));
p1.setLocation(p1.x - width1, p1.y);
p2.setLocation(p2.x - width2, p2.y);
g2D.draw(new Line2D.Float(p1, p2));
p1.setLocation(p1.x, p1.y - height1);
p2.setLocation(p2.x, p2.y - height2);
g2D.draw(new Line2D.Float(p1, p2));
g2D.drawString("Lines and rectangles", 60, 250); // Draw some text
}
If you type this in correctly and recompile SketchView class, the Sketcher window will look like:
How It Works
After casting the graphics context object that is passed to the paint() method to type Graphics2D
we set the drawing color to red. All subsequent drawing that we do will be in red until we change the
color with another call to setPaint() . We define a Point2D.Floa t object to represent the position
of the first rectangle, and we define variables to hold the width and height of the rectangle. We use
these to create the rectangle by passing them as arguments to the constructor that we have seen before,
and display the rectangle by passing the rect object to the draw() method for the graphics context,
g2D . The second rectangle is defined by essentially the same process, except that this time we create the
Rectangle2D.Float object in the argument expression for the draw() method.