125 lines
3.6 KiB
C#
125 lines
3.6 KiB
C#
using OfficeOpenXml;
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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namespace friction
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{
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public class ExcelHelper
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{
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//The correct method to convert width to pixel is:
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//Pixel =Truncate(((256 * {width} + Truncate(128/{Maximum DigitWidth}))/256)*{Maximum Digit Width})
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//The correct method to convert pixel to width is:
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//1. use the formula =Truncate(({pixels}-5)/{Maximum Digit Width} * 100+0.5)/100
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// to convert pixel to character number.
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//2. use the formula width = Truncate([{Number of Characters} * {Maximum Digit Width} + {5 pixel padding}]/{Maximum Digit Width}*256)/256
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// to convert the character number to width.
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public const int MTU_PER_PIXEL = 9525;
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public static int ColumnWidth2Pixel(ExcelWorksheet ws, double excelColumnWidth)
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{
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//The correct method to convert width to pixel is:
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//Pixel =Truncate(((256 * {width} + Truncate(128/{Maximum DigitWidth}))/256)*{Maximum Digit Width})
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//get the maximum digit width
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decimal mdw = ws.Workbook.MaxFontWidth;
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//convert width to pixel
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decimal pixels = decimal.Truncate(((256 * (decimal)excelColumnWidth + decimal.Truncate(128 / mdw)) / 256) * mdw);
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//double columnWidthInTwips = (double)(pixels * (1440f / 96f));
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return Convert.ToInt32(pixels);
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}
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public static int Column2Pixel(ExcelWorksheet ws, int iColumn)
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{
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double dX = 0;
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for (int i = 1; i < iColumn; i++)
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dX += ColumnWidth2Pixel(ws, ws.Column(i).Width);
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return (int)dX;
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}
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public static double Pixel2ColumnWidth(ExcelWorksheet ws, int pixels)
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{
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//The correct method to convert pixel to width is:
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//1. use the formula =Truncate(({pixels}-5)/{Maximum Digit Width} * 100+0.5)/100
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// to convert pixel to character number.
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//2. use the formula width = Truncate([{Number of Characters} * {Maximum Digit Width} + {5 pixel padding}]/{Maximum Digit Width}*256)/256
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// to convert the character number to width.
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//get the maximum digit width
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decimal mdw = ws.Workbook.MaxFontWidth;
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//convert pixel to character number
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decimal numChars = decimal.Truncate(decimal.Add((pixels - 5) / mdw * 100, (decimal)0.5)) / 100;
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//convert the character number to width
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decimal excelColumnWidth = decimal.Truncate((decimal.Add(numChars * mdw, 5)) / mdw * 256) / 256;
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return Convert.ToDouble(excelColumnWidth);
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}
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public static int Pixel2NextColumn(ExcelWorksheet ws, int iCol, int iPixels)
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{
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while (iPixels > 0)
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iPixels -= ColumnWidth2Pixel(ws, ws.Column(iCol++).Width);
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return iCol;
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}
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public static int RowHeight2Pixel(double excelRowHeight)
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{
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//convert height to pixel
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decimal pixels = decimal.Truncate((decimal)(excelRowHeight / 0.75));
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return Convert.ToInt32(pixels);
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}
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public static int Row2Pixel(ExcelWorksheet ws, int iRow)
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{
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int iY = 0;
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for (int i = 1; i < iRow; i++)
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iY += RowHeight2Pixel(ws.Row(i).Height);
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return iY;
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}
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public static double Pixel2RowHeight(int pixels)
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{
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//convert height to pixel
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double excelRowHeight = pixels * 0.75;
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return excelRowHeight;
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}
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public static int Pixel2NextRow(ExcelWorksheet ws, int iRow, int iPixels)
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{
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double dPixels = iPixels;
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while(dPixels > 0)
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dPixels -= RowHeight2Pixel(ws.Row(iRow++).Height);
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return iRow;
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}
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public static int MTU2Pixel(int mtus)
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{
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//convert MTU to pixel
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decimal pixels = decimal.Truncate(mtus / MTU_PER_PIXEL);
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return Convert.ToInt32(pixels);
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}
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public static int Pixel2MTU(int pixels)
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{
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//convert pixel to MTU
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int mtus = pixels * MTU_PER_PIXEL;
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return mtus;
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}
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}
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}
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