d2d.font.ttftext source code

1 module d2d.font.ttftext;
2 
3 version(BindSDL_TTF):
4 
5 import d2d;
6 
7 import std.algorithm : max;
8 
9 /// Implementation containing text drawable functions using a TTF font. Nice for static texts, slow for dynamic texts.
10 class TTFText : RectangleShape, IText
11 {
12 private:
13 	float _scale = 1.0f;
14 	string _text = "";
15 	TTFFont _font;
16 	bool _multiline = false;
17 
18 public:
19 	/// Creates an empty ttf text
20 	this(TTFFont font)
21 	{
22 		_font = font;
23 		texture = new Texture();
24 		texture.create(0, 0, []);
25 	}
26 
27 	/// Gets the scale in percent.
28 	override @property float scale()
29 	{
30 		return _scale;
31 	}
32 
33 	/// Sets the scale in percent.
34 	override @property void scale(float value)
35 	{
36 		_scale = value;
37 	}
38 
39 	/// Gets the text.
40 	override @property string text()
41 	{
42 		return _text;
43 	}
44 
45 	/// Modifies the text.
46 	override @property void text(string value)
47 	{
48 		if (_text != value)
49 		{
50 			_text = value;
51 			redraw();
52 		}
53 	}
54 
55 	/// Returns if this text should be rendered multiline.
56 	@property bool multiline()
57 	{
58 		return _multiline;
59 	}
60 
61 	/// Sets if this text should be rendered multiline.
62 	@property void multiline(bool value)
63 	{
64 		if (_multiline != value)
65 		{
66 			_multiline = value;
67 			redraw();
68 		}
69 	}
70 
71 	/// Should get called automatically when something changed.
72 	void redraw()
73 	{
74 		Bitmap bmp;
75 		if (_multiline)
76 		{
77 			string[] lines = text.split('\n');
78 			int maxWidth = 0;
79 			foreach (string line; lines)
80 			{
81 				int w, h;
82 				TTF_SizeText(_font.handle, line.toStringz(), &w, &h);
83 				maxWidth = max(w, maxWidth);
84 			}
85 			bmp = Bitmap.fromSurface(TTF_RenderUTF8_Blended_Wrapped(_font.handle, text.toStringz(), Color.White.sdl_color, maxWidth));
86 		}
87 		else
88 		{
89 			bmp = Bitmap.fromSurface(TTF_RenderUTF8_Blended(_font.handle, text.toStringz(), Color.White.sdl_color));
90 		}
91 		if (!bmp.valid)
92 			throw new Exception(cast(string) TTF_GetError().fromStringz());
93 		texture.recreateFromBitmap(bmp, "Blended Text: \"" ~ text ~ "\"");
94 		size = vec2(texture.width, texture.height);
95 		create();
96 	}
97 
98 	override void draw(IRenderTarget target, ShaderProgram shader = null)
99 	{
100 		matrixStack.push();
101 		matrixStack.top = matrixStack.top * mat4.scaling(_scale, _scale, 1);
102 		super.draw(target, shader);
103 		matrixStack.pop();
104 	}
105 
106 	override @property bool valid()
107 	{
108 		return super.valid;
109 	}
110 
111 	override void dispose()
112 	{
113 		super.dispose();
114 	}
115 }