PointToPixel

PointToPixel(double)

Converts points to pixels at 96 dpi.

public static double PointToPixel(double points)
ParameterTypeDescription
pointsDoubleThe value to convert.

Remarks

1 inch equals 72 points.

Examples

Shows how to specify page properties in pixels.

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

// A section's "Page Setup" defines the size of the page margins in points.
// We can also use the "ConvertUtil" class to use a different measurement unit,
// such as pixels when defining boundaries.
PageSetup pageSetup = builder.PageSetup;
pageSetup.TopMargin = ConvertUtil.PixelToPoint(100);
pageSetup.BottomMargin = ConvertUtil.PixelToPoint(200);
pageSetup.LeftMargin = ConvertUtil.PixelToPoint(225);
pageSetup.RightMargin = ConvertUtil.PixelToPoint(125);

// A pixel is 0.75 points.
Assert.AreEqual(0.75d, ConvertUtil.PixelToPoint(1));
Assert.AreEqual(1.0d, ConvertUtil.PointToPixel(0.75));

// The default DPI value used is 96.
Assert.AreEqual(0.75d, ConvertUtil.PixelToPoint(1, 96));

// Add content to demonstrate the new margins.
builder.Writeln($"This Text is {pageSetup.LeftMargin} points/{ConvertUtil.PointToPixel(pageSetup.LeftMargin)} pixels from the left, " +
                $"{pageSetup.RightMargin} points/{ConvertUtil.PointToPixel(pageSetup.RightMargin)} pixels from the right, " +
                $"{pageSetup.TopMargin} points/{ConvertUtil.PointToPixel(pageSetup.TopMargin)} pixels from the top, " +
                $"and {pageSetup.BottomMargin} points/{ConvertUtil.PointToPixel(pageSetup.BottomMargin)} pixels from the bottom of the page.");

doc.Save(ArtifactsDir + "UtilityClasses.PointsAndPixels.docx");

See Also

PointToPixel(double, double)

Converts points to pixels at the specified pixel resolution.

public static double PointToPixel(double points, double resolution)
ParameterTypeDescription
pointsDoubleThe value to convert.
resolutionDoubleThe dpi (dots per inch) resolution.

Remarks

1 inch equals 72 points.

Examples

Shows how to use convert points to pixels with default and custom resolution.

Document doc = new Document();
DocumentBuilder builder = new DocumentBuilder(doc);

// Define the size of the top margin of this section in pixels, according to a custom DPI.
const double myDpi = 192;

PageSetup pageSetup = builder.PageSetup;
pageSetup.TopMargin = ConvertUtil.PixelToPoint(100, myDpi);

Assert.AreEqual(37.5d, pageSetup.TopMargin, 0.01d);

// At the default DPI of 96, a pixel is 0.75 points.
Assert.AreEqual(0.75d, ConvertUtil.PixelToPoint(1));

builder.Writeln($"This Text is {pageSetup.TopMargin} points/{ConvertUtil.PointToPixel(pageSetup.TopMargin, myDpi)} " +
                $"pixels (at a DPI of {myDpi}) from the top of the page.");

// Set a new DPI and adjust the top margin value accordingly.
const double newDpi = 300;
pageSetup.TopMargin = ConvertUtil.PixelToNewDpi(pageSetup.TopMargin, myDpi, newDpi);
Assert.AreEqual(59.0d, pageSetup.TopMargin, 0.01d);

builder.Writeln($"At a DPI of {newDpi}, the text is now {pageSetup.TopMargin} points/{ConvertUtil.PointToPixel(pageSetup.TopMargin, myDpi)} " +
                "pixels from the top of the page.");

doc.Save(ArtifactsDir + "UtilityClasses.PointsAndPixelsDpi.docx");

See Also

ConvertUtil.PointToInch