Skew v1.0 (with source code)

[BoltBait 3,235]

BoltBait's Skew Plugin v1.0

 

Once installed, find Skew Horizontal and Skew Vertical in the Effects > Distort menu:

 

Skew Vertical pretty much looks the same.

 

Download:

 

Until I add this to my latest plugin pack, you can download it here...

 

Skew.zip

 

To install this plugin, download skew.zip to your desktop, unzip all files to your desktop, and run the Install_Skew.bat file to install the Skew.dll file to your Paint.NET Effects directory.

 

Source Code:

 

Spoiler

// Name: Skew Horizontal
// Submenu: Distort
// Author: BoltBait
// Title: BoltBait's Skew - Horizontal v1.0
// Version: 1.0
// Desc: Skew selection
// Keywords: skew
// URL: https://BoltBait.com/pdn
// Force Aliased Selection
#region UICode
IntSliderControl Amount1 = 0; // [-50,50] 
CheckboxControl Amount5 = true; // Fine Control
CheckboxControl Amount4 = true; // Clamp to Selection
CheckboxControl Amount2 = false; // Nearest Neighbor
CheckboxControl Amount3 = false; // Wrapped
#endregion

Surface selectionSurface = null;

void PreRender(Surface dst, Surface src)
{
    // Thanks to toe_head2001 for this PreRender code
    // which is useful for clamping to selection
    Rectangle selection = this.EnvironmentParameters.SelectionBounds;
    if (selectionSurface == null || selectionSurface.Size != selection.Size)
    {
        selectionSurface?.Dispose(); selectionSurface = null;
        selectionSurface = new Surface(selection.Size);
    }
    selectionSurface.CopySurface(src, Point.Empty, selection);
}

void Render(Surface dst, Surface src, Rectangle rect)
{
    int Step = Amount1;
    if (!Amount5)
    {
        Step *= 10;
    }
    Rectangle selection = EnvironmentParameters.SelectionBounds;
    float CenterY = ((selection.Bottom - selection.Top) / 2f) + selection.Top;
    for (int y = rect.Top; y < rect.Bottom; y++)
    {
        if (IsCancelRequested) return;
        float p = (CenterY - y) / (CenterY - selection.Top);
        for (int x = rect.Left; x < rect.Right; x++)
        {
            float XOffset = (-Step) * p;
            if (Amount3)
            {
                if (Amount2)
                {
                    if (Amount4)
                    {
                        dst[x,y] = selectionSurface.GetBilinearSampleWrapped((int)(x+XOffset-selection.Left), y-selection.Top);
                    }
                    else
                    {
                        dst[x,y] = src.GetBilinearSampleWrapped((int)(x+XOffset), y);
                    }
                }
                else
                {
                    if (Amount4)
                    {
                        dst[x,y] = selectionSurface.GetBilinearSampleWrapped(x+XOffset-selection.Left, y-selection.Top);
                    }
                    else
                    {
                        dst[x,y] = src.GetBilinearSampleWrapped(x+XOffset, y);
                    }
                }
            }
            else
            {
                if (Amount2)
                {
                    if (Amount4)
                    {
                        dst[x,y] = selectionSurface.GetBilinearSampleClamped((int)(x+XOffset-selection.Left), y-selection.Top);
                    }
                    else
                    {
                        dst[x,y] = src.GetBilinearSampleClamped((int)(x+XOffset), y);
                    }
                }
                else
                {
                    if (Amount4)
                    {
                        dst[x,y] = selectionSurface.GetBilinearSampleClamped(x+XOffset-selection.Left, y-selection.Top);
                    }
                    else
                    {
                        dst[x,y] = src.GetBilinearSampleClamped(x+XOffset, y);
                    }
                }
            }
        }
    }
}

 

 

Enjoy. 😎 

[docmaster 0]

Install_Skew.bat//прекрасно подошёл и открыл все ранее загруженные эффекты.

[ReMake 996]

@docmaster, read the Forum Rules, please. In particular #22. And I believe that you are mistaken in claiming that Install_Skew.bat "opened all previously loaded effects".

The same applies to your comment in the Water Reflection topic.

 

@BoltBait sorry for off topic.

 

[docmaster 0]

excuse my not literacy, it was about Mirror, which did not open immediately. And after downloading Skew v1.0

[Djisves 534]

Installed and working as expected. Thank you @BoltBait.

[Scooter 289]

BoltBait  I Really like this.  I don't understand it, but I do like the pretty skews and skew-ers  and all.  I have enclosed a mighty work of artistic doggerel, to show you.

p.s. pay no attention to me, it is a great bit of program writer-ry  an all.