| clearRect |
(Object obj, Number x, Number y, Number w, Number h) |
yoix.graphics |
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Clears a rectangle in
obj,
which must be an
Image
or a drawable component (i.e., a Swing or AWT component, like a
JCanvas,
JFrame,
or
Canvas,
that supports a
paint
function),
that is
w
units wide,
h
units high, and has its upper left corner at the point
(x,y)
by filling it with
obj's
background color.
It is important to remember that an image always has fixed background color,
but that the background color of a drawable component like a
JCanvas
that has not been explicitly set is inherited from the containers that are used
to display the canvas.
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| Example: |
The program,
import yoix.*.*;
JCanvas c = {
Color background = Color.black;
Graphics graphics = {
Color foreground = Color.blue;
};
paint(clip) {
fillOval(this, 72.0/2, 72.0/2, 72*3, 72*4);
clearRect(this, 72, 72, 72, 72);
}
};
JFrame frame = {
Array layout = {c};
};
frame.visible = TRUE;
sleep(3);
c.background = Color.red;
sleep(5);
exit(0);
defines a paint function in a canvas that draws a blue ellipse with
a 1 inch erased square.
The canvas is displayed in a frame for 3 seconds and then automatically
repainted using a red background and displayed for another 5 seconds.
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| See Also: |
copyArea,
drawArc,
drawImage,
drawLine,
drawOval,
drawPolygon,
drawPolyline,
drawRect,
drawRoundRect,
drawString,
fillArc,
fillOval,
fillPolygon,
fillRect,
fillRoundRect,
pointInPolygon,
pointInRect,
rectContainsRect,
rectIntersectionRect,
rectIntersectsRect,
rectUnionRect,
stringBounds,
stringWidth
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Yoix is a registered trademark of AT&T Inc.
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