GM6 Help. How do you add a trailing effect to an object

ali	GM6 Help. How do you add a trailing effect to an... « on: April 01, 2007, 07:56:50 am »
	I need a code for adding a trailing effect As if the object was moving really fast and you could see the image really blurry behind it Please Help « Last Edit: April 01, 2007, 09:12:23 pm by 4Sword » Logged

cazallx	Re: GM6 Help. How do you add a trailing effect t... « Reply #1 on: April 01, 2007, 08:04:31 am »
Reputation: +0/-0 Offline Posts: 121	you could make objects with a lower alpha or you could make a 2d array where array[trailnumber,0] = x array[trailnumber,1] = y array[trailnumber,2] = image_index array[trailnumber,3] = sprite_image array[trailnumber,4] = alpha then you draw in a for loop and erase them from the array when they fade and then make code to check where a free place in the array is Logged

ali

Re: GM6 Help. How do you add a trailing effect t...

« Reply #2 on: April 01, 2007, 08:09:05 am »

Quote from: cazallx on April 01, 2007, 08:04:31 am

you could make objects with a lower alpha or you could make a 2d array where

array[trailnumber,0] = x
array[trailnumber,1] = y
array[trailnumber,2] = image_index
array[trailnumber,3] = sprite_image
array[trailnumber,4] = alpha

then you draw in a for loop and erase them from the array when they fade and then make code to check where a free place in the array is

wait uh what goes where???

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cazallx

Re: GM6 Help. How do you add a trailing effect t...

« Reply #3 on: April 01, 2007, 08:25:52 am »

Reputation: +0/-0
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Posts: 121

create code

Code: [Select]

/* Creates twenty variables, 'prev_x[1]' and 'prev_y[1]' through
   'prev_x[10]' and 'prev_y[10]'. The first is the current location
   of the object and each of the others represents a previous "ghost"
   of the object, with number 10 being the latest one (10 steps ago).
*/ 

for (ii = 1; ii < 10; ii +=1;) {
 prev_x[ii] = 0;
 prev_y[ii] = 0;
}

step when going fast

Code: [Select]

// Update the current object's positions.
prev_x[1] = x;
prev_y[1] = y;

// Update each of the "ghosts".
for (ii = 10; ii > 1; ii -= 1;) {
 prev_x[ii] = prev_x[ii-1];
 prev_y[ii] = prev_y[ii-1];
}

draw

Code: [Select]

// Draw the sprite and its 9 "ghosts" at logical alpha values.
for (ii = 1; ii < 10; ii += 1;) {
 draw_sprite_ext(sprite_index,-1,prev_x[ii],prev_y[ii],1,1,0,c_white,0.5*(10-ii)/10);
}

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ali	Re: GM6 Help. How do you add a trailing effect t... « Reply #4 on: April 01, 2007, 08:30:29 am »
	When I pu the code in it is not colored So I think it doesn't work WTF is up wit that? Logged

cazallx	Re: GM6 Help. How do you add a trailing effect t... « Reply #5 on: April 01, 2007, 08:31:38 am »
Reputation: +0/-0 Offline Posts: 121	what do you mean? post your code Logged

ali	Re: GM6 Help. How do you add a trailing effect t... « Reply #6 on: April 01, 2007, 08:44:40 am »
	Quote from: cazallx on April 01, 2007, 08:31:38 am what do you mean? post your code I put the same thing you put except when I pasted it into the code area It was all black instead of colored Logged

cazallx	Re: GM6 Help. How do you add a trailing effect t... « Reply #7 on: April 01, 2007, 08:46:09 am »
Reputation: +0/-0 Offline Posts: 121	i dont see how that could happen. could you post all your objects code to see if a can see anything that could cause it. Logged

ali	Re: GM6 Help. How do you add a trailing effect t... « Reply #8 on: April 01, 2007, 08:50:13 am »
	Quote from: cazallx on April 01, 2007, 08:46:09 am i dont see how that could happen. could you post all your objects code to see if a can see anything that could cause it. the name of the object that is moving, The ship is Code: [Select] `objship` that is the only thing you really need Logged

cazallx	Re: GM6 Help. How do you add a trailing effect t... « Reply #9 on: April 01, 2007, 08:56:17 am »
Reputation: +0/-0 Offline Posts: 121	my code does not make things black so its probably somewhere in your code wait post your draw code i think i know what it is. Logged

Bistian Procedurally generated bro.	Re: GM6 Help. How do you add a trailing effect t... « Reply #10 on: April 01, 2007, 09:36:19 am »
That's right, I'm back. Reputation: +0/-0 Offline Gender: Posts: 129	Drag and Drop : If Step () { Create Objtail at 0*0 relative Position } For Tail : If Animation End { Destroy self } Logged

mit	Re: GM6 Help. How do you add a trailing effect t... « Reply #11 on: April 01, 2007, 11:12:59 am »
QBASIC programmer since age 4. Take that, world. Reputation: +0/-0 Offline Posts: 1079	I don't think anyone's noticed that drawing your previous positions wouldn't create a nice trail. When the object moves, the faster the movement, the larger the gaps between the trailing bits. It's not a pretty effect, trust me. When needs to be done is pay attention to when a trail should appear. It should only remember one previous position, which is already stored by GM. It should then look at the distance travelled this step, and draw a trail accordingly. It's much nicer, and uses less memory. I guess it doesn't matter if you're moving at a consistent speed, but whatever. Logged
	Programmer / Spriter / Level designer / Game Director / Web Designer / Music Sequencer for Random Highscore table: Play the Kousou Arcade today!

Bistian Procedurally generated bro.	Re: GM6 Help. How do you add a trailing effect t... « Reply #12 on: April 01, 2007, 01:23:34 pm »
That's right, I'm back. Reputation: +0/-0 Offline Gender: Posts: 129	If the Main Object have larger Speed in a Direction you simple make the Trail moving to the Main Object to ! Logged

mit	Re: GM6 Help. How do you add a trailing effect t... « Reply #13 on: April 01, 2007, 02:40:11 pm »
QBASIC programmer since age 4. Take that, world. Reputation: +0/-0 Offline Posts: 1079	Uh, not quite sure what you mean... Here's an example of my way Logged
	Programmer / Spriter / Level designer / Game Director / Web Designer / Music Sequencer for Random Highscore table: Play the Kousou Arcade today!

cazallx	Re: GM6 Help. How do you add a trailing effect t... « Reply #14 on: April 01, 2007, 05:33:07 pm »
Reputation: +0/-0 Offline Posts: 121	use mits it is the best. Logged

ali	Re: GM6 Help. How do you add a trailing effect t... « Reply #15 on: April 01, 2007, 09:10:22 pm »
	Thanks mit, I will try it now Logged

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