Areaspublic class Areas extends ControlsSurface | The Areas class demonstrates the CAG (Constructive Area Geometry)
operations: Add(union), Subtract, Intersect, and ExclusiveOR. |
| Fields Summary |
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| protected String | areaType |
| Constructors Summary |
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public Areas()
setBackground(Color.white);
setControls(new Component[] { new DemoControls(this) });
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| Methods Summary |
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| public static void | main(java.lang.String[] argv)
createDemoFrame(new Areas());
| | public void | render(int w, int h, java.awt.Graphics2D g2)
GeneralPath p1 = new GeneralPath();
p1.moveTo( w * .25f, 0.0f);
p1.lineTo( w * .75f, h * .5f);
p1.lineTo( w * .25f, (float) h);
p1.lineTo( 0.0f, h * .5f);
p1.closePath();
GeneralPath p2 = new GeneralPath();
p2.moveTo( w * .75f, 0.0f);
p2.lineTo( (float) w, h * .5f);
p2.lineTo( w * .75f, (float) h);
p2.lineTo( w * .25f, h * .5f);
p2.closePath();
Area area = new Area(p1);
g2.setColor(Color.yellow);
if (areaType.equals("nop")) {
g2.fill(p1);
g2.fill(p2);
g2.setColor(Color.red);
g2.draw(p1);
g2.draw(p2);
return;
} else if (areaType.equals("add")) {
area.add(new Area(p2));
} else if (areaType.equals("sub")) {
area.subtract(new Area(p2));
} else if (areaType.equals("xor")) {
area.exclusiveOr(new Area(p2));
} else if (areaType.equals("int")) {
area.intersect(new Area(p2));
} else if (areaType.equals("pear")) {
double sx = w/100;
double sy = h/140;
g2.scale(sx, sy);
double x = w/sx/2;
double y = h/sy/2;
// Creates the first leaf by filling the intersection of two Area
// objects created from an ellipse.
Ellipse2D leaf = new Ellipse2D.Double(x-16, y-29, 15.0, 15.0);
Area leaf1 = new Area(leaf);
leaf.setFrame(x-14, y-47, 30.0, 30.0);
Area leaf2 = new Area(leaf);
leaf1.intersect(leaf2);
g2.setColor(Color.green);
g2.fill(leaf1);
// Creates the second leaf.
leaf.setFrame(x+1, y-29, 15.0, 15.0);
leaf1 = new Area(leaf);
leaf2.intersect(leaf1);
g2.fill(leaf2);
// Creates the stem by filling the Area resulting from the
// subtraction of two Area objects created from an ellipse.
Ellipse2D stem = new Ellipse2D.Double(x, y-42, 40.0, 40.0);
Area st1 = new Area(stem);
stem.setFrame(x+3, y-47, 50.0, 50.0);
st1.subtract(new Area(stem));
g2.setColor(Color.black);
g2.fill(st1);
// Creates the pear itself by filling the Area resulting from the
// union of two Area objects created by two different ellipses.
Ellipse2D circle = new Ellipse2D.Double(x-25, y, 50.0, 50.0);
Ellipse2D oval = new Ellipse2D.Double(x-19, y-20, 40.0, 70.0);
Area circ = new Area(circle);
circ.add(new Area(oval));
g2.setColor(Color.yellow);
g2.fill(circ);
return;
}
g2.fill(area);
g2.setColor(Color.red);
g2.draw(area);
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