Question - Code need help with premitive

[MrMouse]

Hi, i need some help with premitive.
I use vertex buffer to make some shape and draw it to screen.
And i can't find the way to increase width to my line. GMS2 give me the pretty line with 1pixel width, but i need up it to any value with save the silhouette. I try to use the pr_trianglestrip, but it's look terrible. I need somethink like outline with random count of pixels.

Update: but i have another problem, how i can blur this now? I need somethink like gaussian blur from photoshop.

 

[YellowAfterlife]

Since GPU can only draw lines and triangles, you will need to "extrude" your line into triangles.
This can be don with sin/cos or lengthdir_x/lengthdir_y and a bit of logic to handle turns:
the inner (circled) point can be either computed through actual line intersection check, or by taking an average between first and second line segment angles and then stepping 90 degrees from that in the according direction.

 

[MrMouse]

This can be don with sin/cos or lengthdir_x/lengthdir_y and a bit of logic to handle turns:

yes, i know this point, same i make my line, but it i would rotate the line my point would get offset, wich dont be correct in some angle. And if i add same method to each poin of my shape - it vould be vortex premitive...

 

[MrMouse]

This can be don with

sorry, man, i am an idiot, find mistake in my code, thx 4 help!

 

[YellowAfterlife]

yes, i know this point, same i make my line, but it i would rotate the line my point would get offset, wich dont be correct in some angle. And if i add same method to each poin of my shape - it vould be vortex premitive...

Insertion of an additional triangle on "turns" allows to avoid distortions.

Similar approach is used when drawing fancier paths as well (random example):

 

[MrMouse]

Insertion of an additional triangle on "turns" allows to avoid distortions.

hmmm, i just add one moar test lengthdir_x/lengthdir_y to position of support point, and get somethink like i need. Thx. In try before i have code mistake with this way

 

[MrMouse]

but i have another problem, how i can blur this now? I need somethink like gaussian blur from photoshop.

 

[Bingdom]

Through a shader. Do a google search and it should bring you to the marketplace that has examples of how it's done.

 

[YellowAfterlife]

Through a shader. Do a google search and it should bring you to the marketplace that has examples of how it's done.

Other option: give the line a texture with gradient-ish fade to simulate blur. That would be faster than a shader in this case.