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using System;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Plex.Engine.GraphicsSubsystem;
using Microsoft.Xna.Framework.Graphics;
namespace Plex.Engine
{
public enum WrapMode
{
None,
Words,
Letters
}
/// <summary>
/// A class for rendering text.
/// </summary>
public static class TextRenderer
{
private static string WrapLine(SpriteFont font, string text, float maxLineWidth)
{
if (string.IsNullOrEmpty(text))
return text;
if (font.MeasureString(text).X <= maxLineWidth)
return text;
text = text.Trim();
var sb = new StringBuilder();
return sb.ToString().TrimEnd();
}
/// <summary>
/// Perform text wrapping on a string of text using the specified <see cref="SpriteFont"/>.
/// </summary>
/// <param name="font">The <see cref="SpriteFont"/> representing the font to measure the text in.</param>
/// <param name="text">The text to wrap.</param>
/// <param name="maxLineWidth">The maximum width (in pixels) that a line of text can be.</param>
/// <param name="mode">The type of text wrapping to apply.</param>
/// <returns>The resulting wrapped text.</returns>
public static string WrapText(SpriteFont font, string text, float maxLineWidth, WrapMode mode)
{
if (string.IsNullOrEmpty(text))
return text;
if (font.MeasureString(text).X <= maxLineWidth)
return text;
if (mode == WrapMode.Words)
{
float spacewidth = font.MeasureString(" ").X;
if (maxLineWidth < spacewidth)
return text;
text = text.Trim().Replace("\r", "");
string[] lines = text.Split('\n');
float lineWidth = 0;
var sb = new StringBuilder();
foreach (var line in lines)
{
lineWidth = 0;
if (sb.Length>0)
sb.Append("\n");
var words = line.Split(' ').ToList();
for (int i = 0; i < words.Count; i++)
{
string word = words[i];
Vector2 size = font.MeasureString(word);
if (lineWidth + size.X <= maxLineWidth)
{
sb.Append(word + " ");
lineWidth += size.X + spacewidth;
}
else
{
if (size.X >= maxLineWidth)
{
if (sb.Length>0)
sb.Append("\n");
int half = word.Length / 2;
string first = word.Substring(0, half);
string second = word.Substring(half);
words[i] = first;
words.Insert(i + 1, second);
i--;
continue;
}
else
{
sb.Append("\n" + word + " ");
lineWidth = size.X + spacewidth;
}
}
}
}
return sb.ToString().TrimEnd();
}
else
{
float lineWidth = 0;
string newstr = "";
foreach (char c in text)
{
var measure = font.MeasureString(c.ToString());
if(lineWidth + measure.X > maxLineWidth)
{
newstr += "\n";
lineWidth = 0;
}
else
{
if (c == '\n')
{
lineWidth = 0;
}
else
lineWidth += measure.X;
}
newstr += c;
}
return newstr;
}
}
/// <summary>
/// Measure a string of text to get its width and height in pixels.
/// </summary>
/// <param name="text">The text to measure</param>
/// <param name="font">The font to measure with</param>
/// <param name="maxwidth">The maximum width text can be before it is wrapped</param>
/// <param name="wrapMode">The wrap mode to use</param>
/// <returns>The size in pixels of the text.</returns>
public static Vector2 MeasureText(string text, SpriteFont font, int maxwidth, WrapMode wrapMode)
{
if (string.IsNullOrEmpty(text))
return Vector2.Zero;
switch (wrapMode)
{
case WrapMode.None:
return font.MeasureString(text);
default:
return font.MeasureString(WrapText(font, text, maxwidth, wrapMode));
}
}
/// <summary>
/// Render a string of text.
/// </summary>
/// <param name="gfx">The graphics context to render the text to.</param>
/// <param name="text">The text to render.</param>
/// <param name="x">The X coordinate of the text.</param>
/// <param name="y">The Y coordinate of the text.</param>
/// <param name="font">The font to render the text in.</param>
/// <param name="maxwidth">The maximum width text can be before it is wrapped.</param>
/// <param name="alignment">The alignment of the text.</param>
/// <param name="wrapMode">The type of text wrapping to use.</param>
/// <param name="color">The color of the text to render</param>
public static void DrawText(GraphicsContext gfx, int x, int y, string text, SpriteFont font, Color color, int maxwidth, TextAlignment alignment, WrapMode wrapMode)
{
if (string.IsNullOrEmpty(text))
return;
string measured = (wrapMode == WrapMode.None) ? text : WrapText(font, text, maxwidth, wrapMode);
string[] lines = measured.Split('\n');
for (int i = 0; i < lines.Length; i++)
{
var line = lines[i];
var measure = font.MeasureString(line);
switch (alignment)
{
case TextAlignment.Left:
gfx.Batch.DrawString(font, line, new Vector2(x, y + (measure.Y * i)), color);
break;
case TextAlignment.Center:
gfx.Batch.DrawString(font, line, new Vector2(x + ((maxwidth-measure.X)/2), y + (measure.Y * i)), color);
break;
case TextAlignment.Right:
gfx.Batch.DrawString(font, line, new Vector2(x + (maxwidth - measure.X), y + (measure.Y * i)), color);
break;
}
}
}
}
/// <summary>
/// Describes how text should be aligned when rendered.
/// </summary>
public enum TextAlignment
{
/// <summary>
/// Text should be aligned to the centre of the render bounds.
/// </summary>
Center = 0,
/// <summary>
/// Text should be aligned to the left.
/// </summary>
Left = 1,
/// <summary>
/// Text should be rendered to the right.
/// </summary>
Right = 2,
}
/// <summary>
/// Indicates that this <see cref="ATextRenderer"/> should be the default renderer for the game.
/// </summary>
[Obsolete("GDI fonts no longer supported.")]
public class DefaultRenderer : Attribute
{
}
/// <summary>
/// Indicates that this <see cref="ATextRenderer"/> should be the fallback renderer for the game.
/// </summary>
[Obsolete("GDI fonts no longer supported.")]
public class FallbackRenderer : Attribute
{
}
}
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