ref: babf901b4a508c3ec5d1f89655f10377bbdf9637
dir: /appl/spree/other/tstwin.b/
implement Tstwin;
include "sys.m";
sys: Sys;
include "draw.m";
draw: Draw;
Context, Display, Point, Rect, Image, Screen: import draw;
include "tk.m";
tk: Tk;
Toplevel: import tk;
include "tkclient.m";
tkclient: Tkclient;
include "math.m";
math: Math;
Tstwin: module
{
init: fn(ctxt: ref Context, argv: list of string);
};
screen: ref Screen;
display: ref Display;
win: ref Toplevel;
NC: con 6;
task_cfg := array[] of {
"label .xy -text {0 0}",
"canvas .c -height 500 -width 500",
"pack .xy -side top -fill x",
"pack .c -side bottom -fill both -expand 1",
"bind .c <ButtonRelease-1> {send cmd 0 1 %x %y}",
"bind .c <ButtonRelease-2> {send cmd 0 2 %x %y}",
"bind .c <Button-1> {send cmd 1 1 %x %y}",
"bind .c <Button-2> {send cmd 1 2 %x %y}",
};
Obstacle: adt {
line: ref Line;
s1, s2: real;
id: int;
config: fn(b: self ref Obstacle);
new: fn(id: int): ref Obstacle;
};
Line: adt {
p, v: Realpoint;
s: real;
new: fn(p1, p2: Point): ref Line;
hittest: fn(l: self ref Line, p: Point): (Realpoint, real, real);
intersection: fn(b: self ref Line, p, v: Realpoint): (int, Realpoint, real, real);
point: fn(b: self ref Line, s: real): Point;
};
bats: list of ref Obstacle;
init(ctxt: ref Context, argv: list of string)
{
sys = load Sys Sys->PATH;
draw = load Draw Draw->PATH;
tk = load Tk Tk->PATH;
tkclient = load Tkclient Tkclient->PATH;
math = load Math Math->PATH;
sys->pctl(Sys->NEWPGRP, nil);
display = ctxt.display;
screen = ctxt.screen;
tkclient->init();
menubut: chan of string;
(win, menubut) = tkclient->toplevel(screen, nil, "Window testing", 0);
cmd := chan of string;
tk->namechan(win, cmd, "cmd");
tkclient->tkcmds(win, task_cfg);
mch := chan of (int, Point);
spawn mouseproc(mch);
bat := Obstacle.new(0);
bats = bat :: nil;
bat.line = Line.new((100, 0), (150, 500));
bat.s1 = 10.0;
bat.s2 = 110.0;
bat.config();
tk->cmd(win, "update");
buts := 0;
for(;;) alt {
menu := <-menubut =>
tkclient->wmctl(win, menu);
c := <-cmd =>
(nil, toks) := sys->tokenize(c, " ");
if ((hd toks)[0] == '1')
buts |= int hd tl toks;
else
buts &= ~int hd tl toks;
mch <-= (buts, Point(int hd tl tl toks, int hd tl tl tl toks));
}
}
Realpoint: adt {
x, y: real;
};
cmd(top: ref Tk->Toplevel, s: string): string
{
e := tk->cmd(top, s);
if (e != nil && e[0] == '!')
sys->print("tk error %s on '%s'\n", e, s);
return e;
}
p2s(p: Point): string
{
return string p.x + " " + string p.y;
}
mouseproc(mch: chan of (int, Point))
{
for (;;) {
hitbat: ref Obstacle = nil;
minperp, hitdist: real;
(buts, p) := <-mch;
for (bl := bats; bl != nil; bl = tl bl) {
b := hd bl;
(normal, perp, dist) := b.line.hittest(p);
perp = abs(perp);
if ((hitbat == nil || perp < minperp) && (dist >= b.s1 && dist <= b.s2))
(hitbat, minperp, hitdist) = (b, perp, dist);
}
if (hitbat == nil || minperp > 30.0) {
while ((<-mch).t0)
;
continue;
}
offset := hitdist - hitbat.s1;
if (buts & 2)
(buts, p) = aim(mch, hitbat, p);
if (buts & 1)
drag(mch, hitbat, offset);
}
}
drag(mch: chan of (int, Point), hitbat: ref Obstacle, offset: real)
{
line := hitbat.line;
batlen := hitbat.s2 - hitbat.s1;
cvsorigin := Point(int cmd(win, ".c cget -actx"), int cmd(win, ".c cget -acty"));
# cmd(win, "grab set .c");
# cmd(win, "focus .");
loop: for (;;) alt {
(buts, p) := <-mch =>
if (buts & 2)
(buts, p) = aim(mch, hitbat, p);
(v, perp, dist) := line.hittest(p);
dist -= offset;
# constrain bat and mouse positions
if (dist < 0.0 || dist + batlen > line.s) {
if (dist < 0.0) {
p = line.point(offset);
dist = 1.0;
} else {
p = line.point(line.s - batlen + offset);
dist = line.s - batlen;
}
p.x -= int (v.x * perp);
p.y -= int (v.y * perp);
win.image.display.cursorset(p.add(cvsorigin));
}
(hitbat.s1, hitbat.s2) = (dist, dist + batlen);
hitbat.config();
cmd(win, "update");
if (!buts)
break loop;
}
# cmd(win, "grab release .c");
}
CHARGETIME: con 1000.0;
MAXCHARGE: con 50.0;
α: con 0.999; # decay in one millisecond
Max: con 60.0;
D: con 5;
ZERO: con 1e-6;
aim(mch: chan of (int, Point), hitbat: ref Obstacle, p: Point): (int, Point)
{
cvsorigin := Point(int cmd(win, ".c cget -actx"), int cmd(win, ".c cget -acty"));
startms := ms := sys->millisec();
delta := Realpoint(0.0, 0.0);
line := hitbat.line;
charge := 0.0;
pivot := line.point((hitbat.s1 + hitbat.s2) / 2.0);
s1 := p2s(line.point(hitbat.s1));
s2 := p2s(line.point(hitbat.s2));
cmd(win, ".c create line 0 0 0 0 -tags wire");
cmd(win, ".c create oval 0 0 1 1 -fill green -tags ball");
p2: Point;
buts := 2;
for (;;) {
v := makeunit(delta);
bp := pivot.add((int (v.x * charge), int (v.y * charge)));
cmd(win, ".c coords wire "+s1+" "+p2s(bp)+" "+s2);
cmd(win, ".c coords ball "+string (bp.x - D) + " " + string (bp.y - D) + " " +
string (bp.x + D) + " " + string (bp.y + D));
cmd(win, "update");
if ((buts & 2) == 0)
break;
(buts, p2) = <-mch;
now := sys->millisec();
fade := math->pow(α, real (now - ms));
charge = real (now - startms) * (MAXCHARGE / CHARGETIME);
if (charge > MAXCHARGE)
charge = MAXCHARGE;
ms = now;
delta.x = delta.x * fade + real (p2.x - p.x);
delta.y = delta.y * fade + real (p2.y - p.y);
mag := delta.x * delta.x + delta.y * delta.y;
win.image.display.cursorset(p.add(cvsorigin));
}
sys->print("pow\n");
cmd(win, ".c delete wire ball");
cmd(win, "update");
return (buts, p2);
}
makeunit(v: Realpoint): Realpoint
{
mag := math->sqrt(v.x * v.x + v.y * v.y);
if (mag < ZERO)
return (1.0, 0.0);
return (v.x / mag, v.y / mag);
}
#drag(mch: chan of (int, Point), p: Point)
#{
# down := 1;
# cvsorigin := Point(int cmd(win, ".c cget -actx"), int cmd(win, ".c cget -acty"));
# ms := sys->millisec();
# delta := Realpoint(0.0, 0.0);
# id := cmd(win, ".c create line " + p2s(p) + " " + p2s(p));
# coords := ".c coords " + id + " " + p2s(p) + " ";
# do {
# p2: Point;
# (down, p2) = <-mch;
# now := sys->millisec();
# fade := math->pow(α, real (now - ms));
# ms = now;
# delta.x = delta.x * fade + real (p2.x - p.x);
# delta.y = delta.y * fade + real (p2.y - p.y);
# mag := delta.x * delta.x + delta.y * delta.y;
# d: Realpoint;
# if (mag > Max * Max) {
# fade = Max / math->sqrt(mag);
# d = (delta.x * fade, delta.y * fade);
# } else
# d = delta;
#
# cmd(win, coords + p2s(p.add((int d.x, int d.y))));
# win.image.display.cursorset(p.add(cvsorigin));
# cmd(win, "update");
# } while (down);
#}
#
Line.new(p1, p2: Point): ref Line
{
ln := ref Line;
ln.p = (real p1.x, real p1.y);
v := Realpoint(real (p2.x - p1.x), real (p2.y - p1.y));
ln.s = math->sqrt(v.x * v.x + v.y * v.y);
if (ln.s > ZERO)
ln.v = (v.x / ln.s, v.y / ln.s);
else
ln.v = (1.0, 0.0);
return ln;
}
# return normal from line, perpendicular distance from line and distance down line
Line.hittest(l: self ref Line, ip: Point): (Realpoint, real, real)
{
p := Realpoint(real ip.x, real ip.y);
v := Realpoint(-l.v.y, l.v.x);
(nil, nil, perp, ldist) := l.intersection(p, v);
return (v, perp, ldist);
}
Line.point(l: self ref Line, s: real): Point
{
return (int (l.p.x + s * l.v.x), int (l.p.y + s * l.v.y));
}
# compute the intersection of lines a and b.
# b is assumed to be fixed, and a is indefinitely long
# but doesn't extend backwards from its starting point.
# a is defined by the starting point p and the unit vector v.
# return whether it hit, the point at which it hit if so,
# the distance of the intersection point from p,
# and the distance of the intersection point from b.p.
Line.intersection(b: self ref Line, p, v: Realpoint): (int, Realpoint, real, real)
{
det := b.v.x * v.y - v.x * b.v.y;
if (det > -ZERO && det < ZERO)
return (0, (0.0, 0.0), 0.0, 0.0);
y21 := b.p.y - p.y;
x21 := b.p.x - p.x;
s := (b.v.x * y21 - b.v.y * x21) / det;
t := (v.x * y21 - v.y * x21) / det;
if (s < 0.0)
return (0, (0.0, 0.0), s, t);
hit := t >= 0.0 && t <= b.s;
hp: Realpoint;
if (hit)
hp = (p.x+v.x*s, p.y+v.y*s);
return (hit, hp, s, t);
}
blankobstacle: Obstacle;
Obstacle.new(id: int): ref Obstacle
{
cmd(win, ".c create line 0 0 0 0 -width 3 -fill #aaaaaa" + " -tags l" + string id);
o := ref blankobstacle;
o.line = Line.new((0, 0), (0, 0));
o.id = id;
return o;
}
Obstacle.config(o: self ref Obstacle)
{
cmd(win, ".c coords l" + string o.id + " " +
p2s(o.line.point(o.s1)) + " " + p2s(o.line.point(o.s2)));
cmd(win, ".c itemconfigure l" + string o.id + " -fill red");
}
abs(x: real): real
{
if (x < 0.0)
return -x;
return x;
}