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RUBBAND.C
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C/C++ Source or Header
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1980-01-03
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113 lines
/*
* 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.
*/
/*
* Rubberbanding primitives.
*/
#include <InterViews/rubband.h>
#include <InterViews/painter.h>
#include <math.h>
static float DEGS_PER_RAD = 180.0 / M_PI;
float Rubberband::Angle (Coord x0, Coord y0, Coord x1, Coord y1) {
float dx, dy, angle;
dx = float(x1 - x0);
dy = float(y1 - y0);
if (dx != 0) {
angle = DEGS_PER_RAD * atan(dy/dx);
} else if (dy < 0) {
angle = -90;
} else {
angle = 90;
}
if (dx < 0) {
angle += 180;
}
return angle;
}
float Rubberband::Distance (Coord x0, Coord y0, Coord x1, Coord y1) {
float dx = x0 - x1;
float dy = y0 - y1;
return sqrt(dx*dx + dy*dy);
}
Rubberband::Rubberband (Painter* p, Canvas* c, Coord x, Coord y) {
if (p == nil) {
output = nil;
} else {
output = new Painter(p);
output->Begin_xor();
}
canvas = c;
drawn = false;
offx = x;
offy = y;
}
void Rubberband::Draw () {
/* shouldn't be called */
}
void Rubberband::Redraw () {
drawn = false;
Draw();
}
void Rubberband::Erase () {
if (drawn) {
drawn = false;
Draw();
drawn = false;
}
}
void Rubberband::Track (Coord x, Coord y) {
if (x != trackx || y != tracky) {
Erase();
trackx = x;
tracky = y;
Draw();
}
}
Rubberband::~Rubberband () {
Unref(output);
}
void Rubberband::SetPainter (Painter* p) {
if (p != output) {
p->Reference();
Unref(output);
output = p;
output->Begin_xor();
}
}
void Rubberband::SetCanvas (Canvas* c) {
canvas = c;
}