Cannot make Perfect lines (in 2x1)

[Gabrol]

well... I use PDN to make Isometric Pixel Art, but the lines doesn't reeeaaally helps

[Racingdj08]

hold shift to make a perfectly straight line

[Gabrol]

Holding Shift

Green=how it must be

PS: I can make perfect lines with mspaint .-.

[BoltBait]

If you are doing pixel art, what are you doing using the line tool?

True pixel artists would never use anything but the pencil tool.

[Gabrol]

Lol, if i use only the pencil, it will be bore XD( and a LOT of people make iso pixel art with lines 2x1 .-.")

and what about the line?

[drakaan]

Holding Shift

Green=how it must be

PS: I can make perfect lines with mspaint .-.

I was about to mention various and sundry things about slopes and those lines' slopes being different, etc, but then I tries to do what (I think) the poster is trying to do.

He's right (to my surprise)...If I make a 200 x 100 px image and try to carefully draw a non-antialiased line from corner to corner, it has a varying slope.

[Rick Brewster]

Holding shift constrains the line to an angle that is a multiple of 15 degrees. The angle you want, if you build the triangle and solve it (opposite edge is 1, adjacent edge is 2, hypotenuse is sqrt(5)), is not a multiple of 15 degrees.

[barkbark00]

Repro:

Draw a 1px non-AA diagonal line 200px across and 100px down in MSPaint.

Then do the same thing in PdN.

Results don't match... :?

[drakaan]

Repro:

Draw a 1px non-AA diagonal line 200px across and 100px down in MSPaint.

Then do the same thing in PdN.

Results don't match... :?

Wow...this just hit me.

Are we *seriously* saying that we wish PDN was more like MS Paint? :shock:

[Ash]

Wow...this just hit me.

Are we *seriously* saying that we wish PDN was more like MS Paint? :shock:

I would guess at least in this case.

[barkbark00]

Repro:

Draw a 1px non-AA diagonal line 200px across and 100px down in MSPaint.

Then do the same thing in PdN.

Results don't match... :?

Wow...this just hit me.

Are we *seriously* saying that we wish PDN was more like MS Paint? :shock:

For a while I was a serious "fanboy" of MS Paint's skew option...until MadJik put the Oblique Effect Plugin out there!

[Gabrol]

Repro:

Draw a 1px non-AA diagonal line 200px across and 100px down in MSPaint.

Then do the same thing in PdN.

Results don't match... :?

Wow...this just hit me.

Are we *seriously* saying that we wish PDN was more like MS Paint? :shock:

For a while I was a serious "fanboy" of MS Paint's skew option...until MadJik put the Oblique Effect Plugin out there!

lol, another bore way to make perfect lines XD

Do it's impossible to create a plugin with "Paint Lines" ?

[BoltBait]

Do it's impossible to create a plugin with "Paint Lines" ?

I have already written that plugin:

http://paintdotnet.12.forumer.com/viewtopic.php?t=3409

[barkbark00]

With the Arrow plugin I get this in a 200x100 selection(brush width set to 1px):

Magnified:

[Gabrol]

Do it's impossible to create a plugin with "Paint Lines" ?

I have already written that plugin:

http://paintdotnet.12.forumer.com/viewtopic.php?t=3409

It's really next, but not perfect x/

[MadJik]

Short solution using CodeLab and based on the Drawline function from BoltBait:

int Amount1=1; //[0,1] Orientation 0=up-down;1=down-up
void Render(Surface dst, Surface src, Rectangle rect) 
{ 
 PdnRegion selectionRegion = EnvironmentParameters.GetSelection(src.Bounds); 
 Rectangle selection = this.EnvironmentParameters.GetSelection(src.Bounds).GetBoundsInt(); 

 int x1,y1,x2,y2;

 if (Amount1==0)
 {
   x1=selection.Left; 
   y1=selection.Top; 
   x2=selection.Right; 
   y2=selection.Bottom; 
 }
 else
 {
   x1=selection.Left; 
   y2=selection.Top; 
   x2=selection.Right; 
   y1=selection.Bottom; 
 }

 ColorBgra PrimaryColor = (ColorBgra)EnvironmentParameters.PrimaryColor; 

 ColorBgra CurrentPixel; 

 for(int y = rect.Top; y < rect.Bottom; y++) 
   for (int x = rect.Left; x < rect.Right; x++) 
     if (selectionRegion.IsVisible(x, y)) 
       dst[x,y] = src[x,y]; 

 DrawLine(x1,y1,x2,y2, dst, PrimaryColor, selectionRegion); 
} 
void DrawLine(int x1, int y1, int x2, int y2, Surface dst, ColorBgra LineColor, PdnRegion selectionRegion) 
{ 
 int i; 
 double roundx,roundy,xi,yi,dx,dy,x,y,l; 

 dx=Math.Abs(x2-x1); 
 dy=Math.Abs(y2-y1); 

 if(Math.Abs(dx)>Math.Abs(dy)) l=dx; else l=dy; 

 xi=2*dx/l; 
 yi=2*dy/l; 
 if ((x2  { 
   if (xi>=1.5) {xi=2;yi=-1;} else if (yi>=1.5) {xi=1;yi=-2;} 
 } 
 else 
 { 
   if (xi>=1.5) {xi=2;yi=1;} else if (yi>=1.5) {xi=1;yi=2;} 
 } 
 x=x1; 
 y=y1; 

 if (selectionRegion.IsVisible((int)x, (int)y)) 
 { 
   dst[(int)x, (int)y] = LineColor; 
 } 

 for(i=1;i<=l;i++) 
 { 
   x = x + xi / 2.0; 
   y = y + yi / 2.0; 

   roundx = x + 0.5; 
   roundy = y + 0.5; 
   if (selectionRegion.IsVisible((int)roundx, (int)roundy)) 
   { 
     dst[(int)roundx, (int)roundy] = LineColor; 
   } 
 } 
}

EDIT:Amount1 to change the orientation...