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raycasting edge detection, under construction

pull/95/head
jmoenig 2020-12-03 09:02:06 +01:00
rodzic b50ddc2480
commit 35a3faa6a0
2 zmienionych plików z 68 dodań i 73 usunięć
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3
HISTORY.md
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@ -18,6 +18,9 @@
* Spanish, thanks, Joan!
* Catalan, thanks, Joan!
### 2020-12-03
* threads: raycasting edge detection, under construction
### 2020-12-02
* threads, blocks: added SIGN function to monadic dropdown
* Catalan translation update, thanks, Joan!

138
src/threads.js
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@ -61,7 +61,7 @@ StageMorph, SpriteMorph, StagePrompterMorph, Note, modules, isString, copy, Map,
isNil, WatcherMorph, List, ListWatcherMorph, alert, console, TableMorph, BLACK,
TableFrameMorph, ColorSlotMorph, isSnapObject, newCanvas, Symbol, SVG_Costume*/
modules.threads = '2020-December-02';
modules.threads = '2020-December-03';
var ThreadManager;
var Process;
@ -4799,10 +4799,49 @@ Process.prototype.reportDistanceFacing = function (name) {
targetBounds,
intersections = [],
dir,
theta,
a, b, x, y,
top, bottom, left, right,
point;
hSect, vSect,
point,
temp;
hSect = (yLevel) => {
var theta = radians(dir);
b = rc.y - yLevel;
a = b * Math.tan(theta);
x = rc.x + a;
if (
(x === rc.x &&
((dir === 180 && rc.y < yLevel) ||
dir === 0 && rc.y > yLevel)
) ||
(x > rc.x && dir >= 0 && dir < 180) ||
(x < rc.x && dir >= 180 && dir < 360)
) {
if (x >= left && x <= right) {
intersections.push(new Point(x, yLevel));
}
}
};
vSect = (xLevel) => {
var theta = radians(360 - dir - 90);
b = rc.x - xLevel;
a = b * Math.tan(theta);
y = rc.y + a;
if (
(y === rc.y &&
((dir === 90 && rc.x < xLevel) ||
dir === 270 && rc.x > xLevel)
) ||
(y > rc.y && dir >= 90 && dir < 270) ||
(y < rc.y && (dir >= 270 || dir < 90))
) {
if (y >= top && y <= bottom) {
intersections.push(new Point(xLevel, y));
}
}
};
if (thisObj) {
rc = thisObj.rotationCenter();
@ -4827,77 +4866,30 @@ Process.prototype.reportDistanceFacing = function (name) {
left = targetBounds.left();
right = targetBounds.right();
// horizontal bounds
theta = radians(dir);
// test if already inside the target
if (targetBounds.containsPoint(rc)) {
intersections.push(rc);
hSect(top);
hSect(bottom);
vSect(left);
vSect(right);
} else {
hSect(top);
hSect(bottom);
vSect(left);
vSect(right);
// top
b = rc.y - top;
a = b * Math.tan(theta);
x = rc.x + a;
if (
(x === rc.x &&
((dir === 180 && rc.y < top) ||
dir === 0 && rc.y > top)
) ||
(x > rc.x && dir > 0 && dir < 180) ||
(x < rc.x && dir > 180 && dir < 360)
) {
if (x >= left && x <= right) {
intersections.push(new Point(x, top));
}
}
// bottom
b = rc.y - bottom;
a = b * Math.tan(theta);
x = rc.x + a;
if (
(x === rc.x &&
((dir === 180 && rc.y < bottom) ||
dir === 0 && rc.y > bottom)
) ||
(x > rc.x && dir > 0 && dir < 180) ||
(x < rc.x && dir > 180 && dir < 360)
) {
if (x >= left && x <= right) {
intersections.push(new Point(x, bottom));
}
}
// vertical bounds
theta = radians(360 - dir - 90);
// left
b = rc.x - left;
a = b * Math.tan(theta);
y = rc.y + a;
if (
(y === rc.y &&
((dir === 90 && rc.x < left) ||
dir === 270 && rc.x > left)
) ||
(y > rc.y && dir > 90 && dir < 270) ||
(y < rc.y && (dir > 270 || dir < 90))
) {
if (y >= top && y <= bottom) {
intersections.push(new Point(left, y));
}
}
// right
b = rc.x - right;
a = b * Math.tan(theta);
y = rc.y + a;
if (
(y === rc.y &&
((dir === 90 && rc.x < right) ||
dir === 270 && rc.x > right)
) ||
(y > rc.y && dir >= 90 && dir < 270) ||
(y < rc.y && (dir > 270 || dir <= 90))
) {
if (y >= top && y <= bottom) {
intersections.push(new Point(right, y));
// sort
if (intersections.length > 1) {
if (Math.sign(rc.x - intersections[0].x) !==
Math.sign(intersections[0].x - intersections[1].x) ||
Math.sign(rc.y - intersections[0].y) !==
Math.sign(intersections[0].y - intersections[1].y)
) {
temp = intersections[0];
intersections[0] = intersections[1];
intersections[1] = temp;
}
}
}