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Author Topic: [Request / Listing] Vertex Move to Point (GML)  (Read 3003 times)

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[Request / Listing] Vertex Move to Point (GML)
« on: June 12, 2006, 08:35:19 pm »
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What I want is a vertex moving from a starting position moving at a given position with the indicated speed.
« Last Edit: March 18, 2012, 06:26:15 am by Niek »
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Re: Move to Point (GML)
« Reply #1 on: June 12, 2006, 08:52:04 pm »
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Are you talking about the delphi code that Mark Overmars used to create the function?
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Re: Move to Point (GML)
« Reply #2 on: June 12, 2006, 09:21:13 pm »
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Well i don't know how GM does it but i figure it would probably look something like...

Code: [Select]
if (obj.x > x) obj.x-=speed;
if (obj.x < x) obj.x+=speed;
if (obj.y > y) obj.y-=speed;
if (obj.y < y) obj.y+=speed;
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Re: Move to Point (GML)
« Reply #3 on: June 12, 2006, 09:23:38 pm »
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Erm Helios, you suck, lol.
It'll look nothing like that, because that allows for only diagonal movement.
What it'll actually do is take the sine and cosine of the direction, multiply them by speed and then add them on to x and y respectively.
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Re: Move to Point (GML)
« Reply #4 on: June 12, 2006, 09:26:05 pm »
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Quote from: Ben on June 12, 2006, 09:23:38 pm
Erm Helios, you suck, lol.
It'll look nothing like that, because that allows for only diagonal movement.
What it'll actually do is take the sine and cosine of the direction, multiply them by speed and then add them on to x and y respectively.

Yeh I know, I didn't wish to make it complex for Master J, besides, that works pretty well if your only after simplistic movement :P, i don't actuall use functions like that if thats what you mean :P.
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Ben
Re: Move to Point (GML)
« Reply #5 on: June 12, 2006, 09:27:34 pm »
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Lol, fine, but he asked for it, and so he shall recieve.
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Re: Move to Point (GML)
« Reply #6 on: June 13, 2006, 06:25:14 pm »
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From what I gather it's two steps...

move_towards_point(new_x, new_y, new_speed) does these calculations:

speed = new_speed
direction = arctan2(y-new_y, new_x-x) * 180 / pi
(^^ which is the same as: direction = point_direction(x, y, new_x, new_y) )

Then whenever speed and/or direction is changed, vspeed and hspeed are changed as well:

hspeed = speed * cos(direction * pi / 180)
vspeed = speed * -sin(direction * pi / 180)  <--- note the negative sine

BUT, it could be the other way around; the function actually changes hspeed and vspeed, which in turn change speed and direction. Doesn't really matter though, it's the same both ways. :P

Then it's just what Ben said, in between Step and End Step it adds those two values to x and y.
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Re: Move to Point (GML)
« Reply #7 on: June 13, 2006, 06:30:27 pm »
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I meant to say to create the source as a script, however, I am not going to use this for the game play, more like a vertex moving towards a point.
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Re: Move to Point (GML)
« Reply #8 on: June 13, 2006, 06:41:29 pm »
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If you wanted a GML script then it would be:
Code: [Select]
speed = argument2
direction = arctan2(y-argument1, argument0-x) * 180 / pi
Which is pointless because the function already exists. :D  Unless you're asking for something different, like making it stop at that point, or applying the movement to some variables other than x and y?
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Re: Move to Point (GML)
« Reply #9 on: June 13, 2006, 06:55:43 pm »
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Well since you got the formula, how would it be for a vertex as a script?

Example: scr_draw_vertex_point(x_start, y_start, x_destination, y_destination, speed);
Draws a vertex from position (x_start, y_start) moving towards point (x_destination, y_destination) at the indicated speed.
« Last Edit: June 13, 2006, 07:03:21 pm by Master J »
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Re: Vertex Move to Point (GML)
« Reply #10 on: June 15, 2006, 08:30:42 pm »
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Someone...
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mit
Re: Vertex Move to Point (GML)
« Reply #11 on: June 15, 2006, 10:14:39 pm »
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I'm not quite sure what you want. All I can say is that you can work out the position relative to you from a distance and direction using the built in functions instead of the trig, lengthdir_x() and lengthdir_y() they're called. So each step
Code: [Select]
x+=lengthdir_x(speed, direction)
y+=lengthdir_y(speed, direction)
is performed.

I suppose what you want could be achived with point_direction() and that?
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Re: Vertex Move to Point (GML)
« Reply #12 on: June 16, 2006, 01:47:34 pm »
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I'm not quite sure what you mean, but you could just draw a line from xstart and ystart to xdestination and ydestination. You'd create an object which moves to that point, and then you can draw a line from the start to the object's coordinates, and move the object at a certain speed, giving the impression you're drawing a moving vertex. Or, you could just use drawing primitives which might make it easier.
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Re: Vertex Move to Point (GML)
« Reply #13 on: June 16, 2006, 07:06:32 pm »
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Quote from: Scooternew on June 16, 2006, 01:47:34 pm
I'm not quite sure what you mean, but you could just draw a line from xstart and ystart to xdestination and ydestination. You'd create an object which moves to that point, and then you can draw a line from the start to the object's coordinates, and move the object at a certain speed, giving the impression you're drawing a moving vertex. Or, you could just use drawing primitives which might make it easier.

Scooternew, you are way of the topic, re-read every post carefully and once more.

Mit, you maybe close but what I want is something like you draw a point not a line Scooternew, or not an object either, from point x_start and y_start moving to x_destination and y_destination, but instead I want a vertex.
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Re: Vertex Move to Point (GML)
« Reply #14 on: June 17, 2006, 02:07:51 am »
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Quote from: Master J on June 16, 2006, 07:06:32 pm
Quote from: Scooternew on June 16, 2006, 01:47:34 pm
I'm not quite sure what you mean, but you could just draw a line from xstart and ystart to xdestination and ydestination. You'd create an object which moves to that point, and then you can draw a line from the start to the object's coordinates, and move the object at a certain speed, giving the impression you're drawing a moving vertex. Or, you could just use drawing primitives which might make it easier.

Scooternew, you are way of the topic, re-read every post carefully and once more.

Mit, you maybe close but what I want is something like you draw a point not a line Scooternew, or not an object either, from point x_start and y_start moving to x_destination and y_destination, but instead I want a vertex.
you can't go blame scooternew for interpreting it wrong
it's your question that's the problem, notice how the following responses basically start with "I don't know what you want"? nobody understands specifically what the hell you want to do

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mit
Re: Vertex Move to Point (GML)
« Reply #15 on: June 17, 2006, 08:57:39 pm »
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I'm just not sure what you mean by vertex, but if you want a point that moves from one place to another, that isn't an object, then I guess you could do something like:
Code: [Select]
p+= (p < point_distance(startX, startY, endX, endY) )
d=point_direction(startX, startY, endX, endY)
draw_point( startX + lengthdir_x(p, d) , startY + lengthdir_y(p, d) )
in the draw event of a controlling object (define p=0 first).
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Re: Vertex Move to Point (GML)
« Reply #16 on: June 19, 2006, 07:43:41 pm »
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What about speed?
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Re: Vertex Move to Point (GML)
« Reply #17 on: June 19, 2006, 09:51:57 pm »
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Uh, speed would just be the amount you increase p by, so repeat the adding of it:
Code: [Select]
repeat 5 p+= (p < point_distance(startX, startY, endX, endY) )
d=point_direction(startX, startY, endX, endY)
draw_point( startX + lengthdir_x(p, d) , startY + lengthdir_y(p, d) )
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Re: Vertex Move to Point (GML)
« Reply #18 on: June 20, 2006, 08:18:49 pm »
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Quote
What I want is a vertex moving from a starting position moving at a given position with the indicated speed.
I'm still confused. A moving vertex? Moving at a position?

This just looks like move_towards_point.
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