Codelab help needed

[Frostyfrog]

So, anyways, I'm trying to make a gradient from 0% alpha to 100% alpha and allow my self to choose the size of the gradient and the distance from the edge of the photo/selection. In it's current state, I can get it to go from 195 alpha to 255, which isn't what I want .

Thank you for all your help!

#region UICode
int Amount1=60;	//[0,255]Length
int Amount2=50;	//[0,255]Distance from Edge
#endregion

void Render(Surface dst, Surface src, Rectangle rect)
{
   // Delete any of these lines you don't need
   Rectangle selection = this.EnvironmentParameters.GetSelection(src.Bounds).GetBoundsInt();
   //long CenterX = (long)(((selection.Right - selection.Left) / 2)+selection.Left);
   long temp = 0;
   long LeftX = (long)(selection.Left + Amount1);
   long LeftMath, RightMath;
   long RightX = (long)(((selection.Right - selection.Left))+selection.Left - Amount1);
   //long CenterY = (long)(((selection.Bottom - selection.Top) / 2)+selection.Top);
   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++)
       {
           CurrentPixel = src[x,y];
           // TODO: Add pixel processing code here
           if ((x <= LeftX))
           {
               temp = x;
               LeftMath = temp / LeftX;
           // Access RGBA values this way, for example:
               CurrentPixel.R = (byte)CurrentPixel.R;
               CurrentPixel.G = (byte)CurrentPixel.G;
               CurrentPixel.B = (byte)CurrentPixel.B;
               //temp = temp-LeftX-LeftMath;
               //temp=x;
               temp=LeftX-temp-LeftMath;
               if(temp>255)temp=255;else if(temp<0)temp=100;
               CurrentPixel.A = (byte)(-temp);
           }
           else if ((x >= RightX))
           {
               RightMath = x / RightX;
           // Access RGBA values this way, for example:
               CurrentPixel.R = (byte)CurrentPixel.R;
               CurrentPixel.G = (byte)CurrentPixel.G;
               CurrentPixel.B = (byte)CurrentPixel.B;
               temp = x-RightX+RightMath;
               CurrentPixel.A = (byte)(temp*255);
           }
           dst[x,y] = CurrentPixel;
       }
   }
}

[W@@dy]

Didn't solve the problem you asked for but if you change

if(temp>255)temp=255;else if(temp<0)temp=100;

to

if(temp>255)temp=255;else if(temp<0)temp=1;

It removes that solid line going down each side.

I'm a little confused by "temp" what exactly is it doing?

I'm new at Codelab, and don't have much C# experience, but enough to know basic coding

I'm trying to learn the ropes really.