Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Text;
namespace lcorneliussen
{
public interface IResizeType
{
Size CalcNewSize(Size currentSize, Size newSize, bool resizeIfSmaller);
}
/// <summary>
/// Offers some helpful methods for image resizing.
/// </summary>
public class ResizeType
{
/// <summary>
/// Returns the new size by fixed height.
/// </summary>
public static IResizeType FixedHeight = new FixedHeightResizeType();
/// <summary>
/// Returns the new size by fixed width.
/// </summary>
public static IResizeType FixedWidth = new FixedWidthResizeType();
/// <summary>
/// Returns a size wich fits in a target size.
/// </summary>
public static IResizeType Fit = new FitResizeType();
/// <summary>
/// Stretches a image to the given size.
/// </summary>
public static IResizeType Stretched = new StretchedResizeType();
private static int CalcNewHeight(int currentWidth, int currentHeight, int newWidth)
{
float ratio = (float)newWidth / (float)currentWidth;
float newHeight = currentHeight * ratio;
return (int)newHeight;
}
private static int CalcNewWidth(int currentWidth, int currentHeight, int newHeight)
{
float ratio = (float)newHeight / (float)currentHeight;
float newWidth = currentWidth * ratio;
return (int)newWidth;
}
private class FixedHeightResizeType : IResizeType
{
public Size CalcNewSize(Size currentSize, Size newSize, bool resizeIfSmaller)
{
int height = newSize.Height;
if (!resizeIfSmaller)
{
if (height > currentSize.Height) height = currentSize.Height;
}
int newWidth = CalcNewWidth(currentSize.Width, currentSize.Height, height);
return new Size(newWidth, height);
}
}
private class FixedWidthResizeType : IResizeType
{
public Size CalcNewSize(Size currentSize, Size newSize, bool resizeIfSmaller)
{
int width = newSize.Width;
if (!resizeIfSmaller)
{
if (width > currentSize.Width) width = currentSize.Width;
}
int newHeight = CalcNewHeight(currentSize.Width, currentSize.Height, width);
return new Size(width, newHeight);
}
}
private class FitResizeType : IResizeType
{
public Size CalcNewSize(Size currentSize, Size newSize, bool resizeIfSmaller)
{
int width = newSize.Width;
int height = newSize.Height;
int newWidth = currentSize.Width;
int newHeight = currentSize.Height;
if (!resizeIfSmaller) // break, if newSize allready fits in currentSize
if (currentSize.Height < height && currentSize.Width < width)
return new Size(currentSize.Width, currentSize.Height);
if(width != newWidth) // shrink or expand to width
{
newHeight = CalcNewHeight(currentSize.Width, currentSize.Height, width);
newWidth = width;
}
if (newHeight > height) //shrink to fit height, if neccesarry
{
newWidth = CalcNewWidth(newWidth, newHeight, height);
newHeight = height;
}
return new Size(newWidth, newHeight);
}
}
private class StretchedResizeType : IResizeType
{
public Size CalcNewSize(Size currentSize, Size newSize, bool resizeIfSmaller)
{
int w = newSize.Width;
int h = newSize.Height;
if (!resizeIfSmaller)
{
if (w > currentSize.Width) w = currentSize.Width;
if (h > currentSize.Height) h = currentSize.Height;
}
return new Size(w, h);
}
}
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
You can’t perform that action at this time.