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ballmaze: also bounce off corners

master
Richard de Boer 2020-04-26 05:35:50 +02:00
parent 66264ea61c
commit 615aeef4cd
1 changed files with 53 additions and 15 deletions
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68
apps/ballmaze/app.js
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@ -99,9 +99,8 @@
y = rH/2; y = rH/2;
vx = vy = 0; vx = vy = 0;
ppx = px = x; ppx = px = x;
ppy = py = y ppy = py = y;
clearWatch();
generateMaze(); // this shows unbuffered progress messages generateMaze(); // this shows unbuffered progress messages
if (settings.cheat && r>1) findRoute(); // not enough memory for r==1 :-( if (settings.cheat && r>1) findRoute(); // not enough memory for r==1 :-(
@ -395,7 +394,7 @@
y += vy/s; y += vy/s;
bounce(); bounce();
} }
if (x>sW-cW+r && y>sH-rH+r) win(); if (x>sW-cW && y>sH-rH) win();
} }
/** /**
@ -407,40 +406,79 @@
function bounce() { function bounce() {
const row = Math.floor(y/sH*rows), col = Math.floor(x/sW*cols), const row = Math.floor(y/sH*rows), col = Math.floor(x/sW*cols),
i = row*cols+col, walls = rooms[i]; i = row*cols+col, walls = rooms[i];
const left = col*cW,
right = (col+1)*cW,
top = row*rH,
bottom = (row+1)*rH;
let bounced = false;
if (vx<0) { if (vx<0) {
const left = col*cW+r; if ((walls&LEFT) && x<=left+r) {
if ((walls&LEFT) && x<=left) { x += (1+e)*(left+r-x);
x += (1+e)*(left-x);
const fy = sign(vy)*d*Math.abs(vx); const fy = sign(vy)*d*Math.abs(vx);
vy -= fy/m; vy -= fy/m;
vx = -vx*e; vx = -vx*e;
bounced = true;
} }
} else { } else {
const right = (col+1)*cW-r; if ((walls&RIGHT) && x>=right-r) {
if ((walls&RIGHT) && x>=right) { x -= (1+e)*(x+r-right);
x -= (1+e)*(x-right);
const fy = sign(vy)*d*Math.abs(vx); const fy = sign(vy)*d*Math.abs(vx);
vy -= fy/m; vy -= fy/m;
vx = -vx*e; vx = -vx*e;
bounced = true;
} }
} }
if (vy<0) { if (vy<0) {
const top = row*rH+r; if ((walls&TOP) && y<=top+r) {
if ((walls&TOP) && y<=top) { y += (1+e)*(top+r-y);
y += (1+e)*(top-y);
const fx = sign(vx)*d*Math.abs(vy); const fx = sign(vx)*d*Math.abs(vy);
vx -= fx/m; vx -= fx/m;
vy = -vy*e; vy = -vy*e;
bounced = true;
} }
} else { } else {
const bottom = (row+1)*rH-r; if ((walls&BOTTOM) && y>=bottom-r) {
if ((walls&BOTTOM) && y>=bottom) { y -= (1+e)*(y+r-bottom);
y -= (1+e)*(y-bottom);
const fx = sign(vx)*d*Math.abs(vy); const fx = sign(vx)*d*Math.abs(vy);
vx -= fx/m; vx -= fx/m;
vy = -vy*e; vy = -vy*e;
bounced = true;
} }
} }
if (bounced) return;
let cx, cy;
if ((rooms[i-1]&TOP) || rooms[i-cols]&LEFT) {
if ((x-left)*(x-left)+(y-top)*(y-top)<=r*r) {
cx = left;
cy = top;
}
}
else if ((rooms[i-1]&BOTTOM) || rooms[i+cols]&LEFT) {
if ((x-left)*(x-left)+(bottom-y)*(bottom-y)<=r*r) {
cx = left;
cy = bottom;
}
}
else if ((rooms[i+1]&TOP) || rooms[i-cols]&RIGHT) {
if ((right-x)*(right-x)+(y-top)*(y-top)<=r*r) {
cx = right;
cy = top;
}
}
else if ((rooms[i+1]&BOTTOM) || rooms[i+cols]&RIGHT) {
if ((right-x)*(right-x)+(bottom-y)*(bottom-y)<=r*r) {
cx = right;
cy = bottom;
}
}
if (!cx) return;
let nx = x-cx, ny = y-cy;
const l = Math.sqrt(nx*nx+ny*ny);
nx /= l;
ny /= l;
const p = vx*nx+vy*ny;
vx -= 2*p*nx*e;
vy -= 2*p*ny*e;
} }
/** /**