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The World of Computer Software
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World_Of_Computer_Software-02-385-Vol-1of3.iso
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EXAMPLES
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SQUARES
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VIEW.C
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1980-01-05
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/*
* Copyright (c) 1987, 1988, 1989 Stanford University
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Stanford not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. Stanford makes no representations about
* the suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* STANFORD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
* IN NO EVENT SHALL STANFORD BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Implementation of squares view.
*/
#include "squares.h"
#include "view.h"
#include <InterViews/painter.h>
#include <InterViews/sensor.h>
#include <InterViews/shape.h>
SquaresView::SquaresView (Squares* s) {
subject = s;
subject->Attach(this);
shape->width = 200;
shape->height = 200;
shape->hunits = 20;
shape->vunits = 20;
}
SquaresView::~SquaresView () {
subject->Detach(this);
}
void SquaresView::Redraw (Coord x1, Coord y1, Coord x2, Coord y2) {
register SquareData* s;
Coord x, y;
int w, h;
output->ClearRect(canvas, x1, y1, x2, y2);
for (s = subject->Head(); s != nil; s = s->next) {
w = round(xmax * s->size) / 2;
h = round(ymax * s->size) / 2;
x = round(xmax * s->cx);
y = round(ymax * s->cy);
if (x1 <= x + w && x2 >= x - w && y1 <= y + h && y2 >= y - h) {
output->Rect(canvas, x - w, y - h, x + w, y + h);
}
}
}
void SquaresView::Update () {
Draw();
}