IronDrawing为希望将RectangleF中使用的测量单位从像素（px）更改为毫米（mm）或反之的用户提供了一个选项。 在RectangleF中使用的默认测量单位是像素（px）。
在实例化了一个具有指定测量单位的新Rectangle上调用转换方法。 例如，使用ConvertTo(MeasurementUnits.Millimeters, 20)。 这将根据用户设置的DPI将Rectangle的测量值转换为毫米。 这种方法也可以应用于RectangleF类。
using IronSoftware.Drawing;
using System;
// Instantiate a Rectangle (Default measurement unit is pixels)
Rectangle pxCropRect = new Rectangle(15, 25, 150, 175); // (X, Y, Width, Height)
// Convert and print a Rectangle measurement in millimeters
Rectangle mmCropRect = pxCropRect.ConvertTo(MeasurementUnits.Millimeters, 20);
Console.WriteLine(mmCropRect.X);
// Instantiate a RectangleF in millimeters
IronSoftware.Drawing.RectangleF pxCropRectFloat = new IronSoftware.Drawing.RectangleF(10F, 25F, 100F, 175F, MeasurementUnits.Millimeters); // (X, Y, Width, Height, Units)
// Convert and print a RectangleF measurement in pixels
IronSoftware.Drawing.RectangleF mmCropRectFloat = pxCropRectFloat.ConvertTo(MeasurementUnits.Pixels, 30);
Console.WriteLine(mmCropRectFloat.Y);
Imports IronSoftware.Drawing
Imports System
' Instantiate a Rectangle (Default measurement unit is pixels)
Dim pxCropRect As Rectangle = New Rectangle(15, 25, 150, 175) ' (X, Y, Width, Height)
' Convert and print a Rectangle measurement in millimeters
Dim mmCropRect As Rectangle = pxCropRect.ConvertTo(MeasurementUnits.Millimeters, 20)
Console.WriteLine(mmCropRect.X)
' Instantiate a RectangleF in millimeters
Dim pxCropRectFloat As IronSoftware.Drawing.RectangleF = New IronSoftware.Drawing.RectangleF(10.0F, 25.0F, 100.0F, 175.0F, MeasurementUnits.Millimeters) ' (X, Y, Width, Height, Units)
' Convert and print a RectangleF measurement in pixels
Dim mmCropRectFloat As IronSoftware.Drawing.RectangleF = pxCropRectFloat.ConvertTo(MeasurementUnits.Pixels, 30)
Console.WriteLine(mmCropRectFloat.Y)
