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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using MonoGame.Extended.BitmapFonts;
using MonoGame.Extended.TextureAtlases;
using Xunit;
namespace MonoGame.Extended.Tests.BitmapFonts
{
public class BitmapFontTests
{
[Fact]
public void BitmapFont_Constructor_Test()
{
var font = CreateTestFont();
Assert.Equal("Impact", font.Name);
Assert.Equal(22, font.LineHeight);
}
[Fact]
public void BitmapFont_MeasureString_SingleWord_Test()
{
var font = CreateTestFont();
var size = font.MeasureString("fox");
Assert.Equal(40, size.Width);
Assert.Equal(font.LineHeight, size.Height);
}
[Fact]
public void BitmapFont_MeasureString_WithLetterSpacing_Test()
{
var font = CreateTestFont();
font.LetterSpacing = 3;
var size = font.MeasureString("fox");
Assert.Equal(46, size.Width);
Assert.Equal(size.Height, font.LineHeight);
}
[Fact]
public void BitmapFont_MeasureString_MultipleLines_Test()
{
var font = CreateTestFont();
var size = font.MeasureString("box fox\nbox of fox");
Assert.Equal(123, size.Width);
Assert.Equal(size.Height, font.LineHeight * 2);
}
[Fact]
public void BitmapFont_MeasureString_EmptyString_Test()
{
var font = CreateTestFont();
var size = font.MeasureString(string.Empty);
Assert.Equal(0, size.Width);
Assert.Equal(0, size.Height);
}
private static BitmapFont CreateTestFont()
{
var textureRegion = new TextureRegion2D(null, x: 219, y: 61, width: 16, height: 18);
var regions = new[]
{
// extracted from 'Impact' font. 'x' is particularly interesting because it has a negative x offset
new BitmapFontRegion(textureRegion, character: ' ', xOffset: 0, yOffset: 0, xAdvance: 6),
new BitmapFontRegion(textureRegion, character: 'b', xOffset: 0, yOffset: 7, xAdvance: 17),
new BitmapFontRegion(textureRegion, character: 'f', xOffset: 0, yOffset: 7, xAdvance: 9),
new BitmapFontRegion(textureRegion, character: 'o', xOffset: 0, yOffset: 11, xAdvance: 16),
new BitmapFontRegion(textureRegion, character: 'x', xOffset: -1, yOffset: 11, xAdvance: 13),
};
var font = new BitmapFont("Impact", regions, lineHeight: 22);
return font;
}
}
}
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