Walk up/down a slope w/o hitTest

[Frag]

Okay, I am trying to add slopes to my Doodle game (stupid server is down ).

I haven't taken Trig yet (I'm 14) so I was hoping some of you Math gurus could help.

I attached a little example I created.

I THINK I'm close.

Thanks,
Frag

[leight]

u want slopes without hitTest???

how can u do that? you want the slopes on a platform right? well then u gota have hitTest dont you?

check the .fla out (i think its tonypa's i dono, he hasnt told me yet )

[Frag]

Why not hitTest?

1) Are stairs possible with hitTest?
2) I can draw stuff on the map MC and I don't have to worry about Doodle landing on it. For example, at the end of the first level it says Level 2 (written with the paintbrush).
3) Really thin objects are skipped over!

Even if you have solutions to all 3 (maybe more I don't know about), I've written 750+ lines based on the system I have now, so converting is too much work at this point.

No help with the math? ;(

[token 3]

here's an old experiment with drawing API in flash, so it's a copy and paste jobby, no hitTest but if you pick it apart you may get some use out of it

wid = 600;
hei = 300;
tmp = _root.createEmptyMovieClip("border", 200000);
sheet = _root.createEmptyMovieClip("bsheet", 100000);
tmp.lineStyle(0);
tmp.lineTo(wid, 0);
tmp.lineTo(wid, hei);
tmp.lineTo(0, hei);
tmp.lineTo(0, 0);
createEmptyMovieClip("land", 0);
gap = 30;
yrange = 15;
xpos = 0;
depth = 0;
ypos = hei-yrange*1.5+Math.random()*yrange;
function createLand() {
	var clip = _root.createEmptyMovieClip("block"+depth++, depth);
	var newY = ypos+Math.random()*yrange-yrange/2;
	if (newY<hei/2) {
		newY = hei/2+Math.random()*yrange/4;
	} else if (newY>hei-20) {
		newY = hei-20-Math.random()*yrange/4;
	}
	clip.x1 = xpos;
	clip.y1 = ypos;
	clip.x2 = xpos+gap;
	clip.y2 = newY;
	clip.m = (clip.y2-clip.y1)/(clip.x2-clip.x1);
	clip.b = clip.y2-clip.m*clip.x2;
	with (clip) {
		lineStyle(2, 0x006600);
		beginFill(0x009900);
		moveTo(xpos, ypos);
		lineTo(xpos+gap, newY);
		lineStyle(0, 0x000000, 0);
		lineTo(xpos+gap, hei);
		lineTo(xpos, hei);
		endFill();
	}
	xpos += gap;
	ypos = newY;
}
for (var i = 0; i<20; i++) {
	createLand();
}
function createMan(w, h, x, y, name) {
	var clip = _root.createEmptyMovieClip("man"+name, 100+d);
	with (clip) {
		_x = x;
		_y = y;
		beginFill(0xFF0000);
		moveTo(-w/2, 0);
		lineTo(w/2, 0);
		lineTo(w/2, -h);
		lineTo(-w/2, -h);
		lineTo(-w/2, 0);
		endFill();
		renderPos();
	}
	d++;
}
MovieClip.prototype.renderPos = function() {
	var pos = Math.floor(this._x/gap);
	var src = _root["block"+pos];
	var ypos = src.m*this._x+src.b;
	this._y = ypos;
};
createMan(10, 20, 50, 150, "L");
createMan(10, 20, 120, 150, "R");
speed = 4;
line = {};
manR.yd = -10;
manL.yd = -10;
this.onEnterFrame = function() {
	//	trace(manR.yd)
	if (Key.isDown(Key.UP)) {
		if (Key.isDown(Key.RIGHT)) {
			manR.yd--;
			if (manR.yd<-20) {
				manR.yd = -20;
			}
		} else if (Key.isDown(Key.LEFT)) {
			manL.yd--;
			if (manL.yd<-20) {
				manL.yd = -20;
			}
		}
	} else if (Key.isDown(Key.DOWN)) {
		if (Key.isDown(Key.RIGHT)) {
			manR.yd++;
			if (manR.yd>-5) {
				manR.yd = -5;
			}
		} else if (Key.isDown(Key.LEFT)) {
			manL.yd++;
			if (manL.yd>-5) {
				manL.yd = -5;
			}
		}
	} else {
		if (Key.isDown(Key.RIGHT)) {
			_root.manL._x += speed;
			_root.manR._x += speed;
		} else if (Key.isDown(Key.LEFT)) {
			_root.manL._x -= speed;
			_root.manR._x -= speed;
		} else {
		}
	}
	line.x1 = manL._x;
	line.y1 = manL._y+manL.yd;
	line.x2 = manR._x;
	line.y2 = manR._y+manR.yd;
	line.m = (line.y2-line.y1)/(line.x2-line.x1);
	line.b = line.y2-line.m*line.x2;
	sheet.clear();
	sheet.lineStyle(3);
	sheet.moveTo(line.x1, line.y1);
	sheet.lineTo(line.x2, line.y2);
	manL.renderPos();
	manR.renderPos();
};
c = 0;
gravity = 0.2;

[leight]

yeh u can make it so:
- u can run up stairs
- yup u can do that writing stuff too, just make the hero test against a 'solid' mc inside the map. keep the stuff u dont want him landing on out of the 'solid' mc (make the 'solid' mc invisible and draw the graphics inside the map mc)
- u dont want him landing on thin objects? well then keep them out of the 'solid' mc too
- u do want him landing on thin objects, draw the thin things in the map mc, just create thicker ground in the 'solid' mc, ur not gona see it so it will be great

well thats how i do it

i know u dont wana change it, but i think if u want slopes... u gota use hitTest



edit: i was gona say 'no math ' but all u gota do is look above my post

[Frag]

YAY!!!

I did it!

Thanks token 3, I realized it was easier than I thought after I reviewed your code

And leight, care to see?

I know I know it's not curvy and wavy and stuff like the artbased FLA, but it will suit my purpose quite nicely

[leight]

ah yeh,

i understand wat u were trying to do now i thort u were trying to do stuff like in art-slopes.fla

mind explaining how u are going to use that? im guessing to walk up steps and heaps of angles - which is very cool

nice work!

[Frag]

Yes, for tons of stairs and hills, one way slides, etc.

[Phlook]

14 too?
I learned trig last yr (im a grade ahead in math), so either ur teachers stupid, or ur gonna learn it soon

[edit]
300th post
[/edit]

[Frag]

I'm in 8th grade at a jr. high, and every morning I go to the high school for an honors geometry/alg 2 class, but its doesn't matter now that neither geometry/trig/alg 2 was required

[Frag]

BTW I learn SohCahToa in geometry but it wasn't working in Flash...

Sine = opposite/hypotenuse;
Cosine = adjacent/hypotenuse;
Tangent = opposite/adjacent;

Too bad I forgot that for the state tests

[Frag]

Care to explain radians?

[Frag]

That's what I wanted before!

Oh well...