created 01/22/00; revised 12/10/10, 06/27/2016
For these exercises, use getWidth() and getHeight()
rather than hard-coding width and height into your code.
Write an program that displays four circles in a square drawing area. Each circle is centered in one of the four quadrants of the drawing area and each circle is a different color.
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Write an program that displays a set of three concentric filled circles of different colors centered in the the program's drawing area.
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Draw a quadrilateral that connects the center points of the four edges of the program.
You might want a filled quadrilateral instead of just lines. To do that, use
fillPolygon(int[] xPoints, int[] yPoints, int nPoints)
and
drawPolygon(int[] xPoints, int[] yPoints, int nPoints)
where X coordinates of each vertex are put in xPoints and the corresponding Y coordinates are in Ypoints.
The number of vertices are in nPoints.
For example, a triangle that fills the upper left half of a 100 by 200 panel could be drawn with
int[] xPoints = [ 0, 0, 199]; int[] yPoints = [ 99, 0, 0 ]; gr.fillPolygon( xPoints, yPoints, 3 );
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Draw a large asterisk * in the center of the the program's drawing area by drawing four lines that intersect in the center. (Harder: draw the * using five short lines that radiate from the center of the program.)
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Draw five nested rectangles of various colors.
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Draw N nested rectangles, where each rectangle is spaced 5 pixels from its neighbors, no matter what the size of the program. N is an integer variable that depends on the size of the program. The larger the program, the more rectangles are drawn. You will need to use a loop for this.
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End of the Exercises