64 lines
3.1 KiB
C#
64 lines
3.1 KiB
C#
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using Microsoft.Xna.Framework;
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using Microsoft.Xna.Framework.Graphics;
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namespace Theriapolis.Game.CodexUI.Core;
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/// <summary>
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/// Renders a 9-slice texture into an arbitrary destination rectangle: the
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/// four corners stay at their authored size, the four edges stretch along
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/// one axis, and the centre stretches both axes. Used for parchment cards,
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/// gilded borders, button backgrounds, and slot frames.
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///
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/// Per-side inset values describe how many source-texture pixels the
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/// fixed-size corner+edge bands take. They must add up to less than the
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/// source texture's width/height in each axis or the centre band collapses.
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/// </summary>
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public readonly struct NineSliceInsets
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{
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public readonly int Left, Top, Right, Bottom;
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public NineSliceInsets(int uniform) : this(uniform, uniform, uniform, uniform) { }
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public NineSliceInsets(int l, int t, int r, int b) { Left = l; Top = t; Right = r; Bottom = b; }
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}
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public static class NineSlice
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{
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/// <summary>
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/// Draw a 9-slice <paramref name="texture"/> tinted with <paramref name="tint"/>
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/// into <paramref name="dest"/> using <paramref name="insets"/> as the corner sizes.
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/// </summary>
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public static void Draw(SpriteBatch sb, Texture2D texture, Rectangle dest,
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NineSliceInsets insets, Color tint)
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{
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int sw = texture.Width;
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int sh = texture.Height;
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int l = insets.Left, t = insets.Top, r = insets.Right, b = insets.Bottom;
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int cw = sw - l - r; // source center width
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int ch = sh - t - b; // source center height
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if (cw < 1) cw = 1;
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if (ch < 1) ch = 1;
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int dl = dest.X;
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int dt = dest.Y;
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int dcw = System.Math.Max(0, dest.Width - l - r);
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int dch = System.Math.Max(0, dest.Height - t - b);
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int dr = dest.X + dest.Width - r;
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int db = dest.Y + dest.Height - b;
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// Corners (1× scale)
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sb.Draw(texture, new Rectangle(dl, dt, l, t), new Rectangle(0, 0, l, t), tint);
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sb.Draw(texture, new Rectangle(dr, dt, r, t), new Rectangle(sw - r, 0, r, t), tint);
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sb.Draw(texture, new Rectangle(dl, db, l, b), new Rectangle(0, sh - b, l, b), tint);
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sb.Draw(texture, new Rectangle(dr, db, r, b), new Rectangle(sw - r, sh - b, r, b), tint);
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// Edges (stretched along their long axis)
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sb.Draw(texture, new Rectangle(dl + l, dt, dcw, t), new Rectangle(l, 0, cw, t), tint);
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sb.Draw(texture, new Rectangle(dl + l, db, dcw, b), new Rectangle(l, sh - b, cw, b), tint);
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sb.Draw(texture, new Rectangle(dl, dt + t, l, dch), new Rectangle(0, t, l, ch), tint);
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sb.Draw(texture, new Rectangle(dr, dt + t, r, dch), new Rectangle(sw - r, t, r, ch), tint);
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// Centre (stretched both axes)
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sb.Draw(texture, new Rectangle(dl + l, dt + t, dcw, dch), new Rectangle(l, t, cw, ch), tint);
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}
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}
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