Editing grad2D - FilterMeisterWiki

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= grad2D =

== Syntax ==
{{int grad2D(int x, int y, int X, int Y, int grad, int dist, int repeat)}}

== Arguments ==
:'''x'''
::Current x coordinate in the gradient field
:'''y'''
::Current y coordinate in the gradient field
:'''X'''
::Vertical size of the gradient field
:'''Y'''
::Horizontal size of the gradient field
:'''grad'''
::Gradient type (0 = Horizontal, 1 = Vertical, 2 = Diagonal, 3 = Diagonal2, 4 = Radial, 5 = Ellipsoid, 6 = Pyramid, 7 = Beam, 8 = Angular, 9 = Star, 10 = Quarter Pyramid , 11 = Quarter Pyramid 2, 12 = Quarter Radial)
:'''dist'''
::0 for linear output, 1 for sine distributed output
:'''repeat'''
::number of gradient repetitions, 0 for no repetition

== Return ==
Returns the gradient value at the coordinates (x,y)

== Description ==
This is a gradient engine. It lets you choose between currently 12 gradient types and contains a parameter for switching between linear and sine distributed output. Additionally there's a parameter for setting the number of gradient repetitions. grad2D() returns a grayscaled gradient value. To produce color gradients, you have to scale the output for the r, g and b values yourself or use the function for each r, g and b value individually. You could also use grad2d() twice with different parameters and use blend() to merge the gradients. So there are a lot of different possibilities. Currently only returns 8-bit color values.

== Example ==
<code>
%ffp

ctl(0): COMBOBOX(vscroll), Action=preview,
        Color=#FFFFFF, Fontcolor=#0000ff,
        Size=(60,200),
        Text="Horizontal\nVertical\n"
        "Diagonal\nDiagonal2\nRadial\n"
        "Ellipsoid\nPyramid\nBeam\n"
        "Angular\nStar\nQuarterPyramid1\n"
        "QuarterPyramid2\nQuarter Radial",
        Val=0
ctl(5): "Repeat", Pos=(270,30), Range=(0,128)
ctl(1): CHECKBOX, Text="Invert", Pos=(270,40)
ctl(2): CHECKBOX, Text="Sine Distribution", Pos=(270,50)
ctl(3): CHECKBOX, Text="Do Some Color Mixing", Pos=(270,70)

ForEveryTile:
{
  int gradient, col;

for (y=y_start; y < y_end; y++) {

updateProgress(y,y_end);

for (x=x_start; x < x_end; x++) {

for (z=0; z < Z; z++) { 
		
        if (ctl(3)) col=(z+1); else col=1;

gradient = grad2D(x, y, X*col, Y*col, ctl(0), ctl(2), ctl(5));
		
        if (ctl(1)) gradient = 255 - gradient;

pset(x, y, z, gradient);
      }
    }
  }

return true;
}
</code>

== See Also ==
((blend))

Summary of change:
Add document to category: