lib/tileset: fix typos in doc

[nit.git] / lib / mnit / tileset.nit

diff --git a/lib/mnit/tileset.nit b/lib/mnit/tileset.nit
index 568fad5..c9dbb16 100644 (file)
--- a/lib/mnit/tileset.nit
+++ b/lib/mnit/tileset.nit
@@ -17,7 +17,7 @@ module tileset
 
 import mnit_display
 
-# Efficienly retrieve tiles in a big image
+# Efficiently retrieve tiles in a big image
 class TileSet
        # The image containing the tileset
        var image: Image
@@ -63,20 +63,20 @@ end
 class TileSetFont
        super TileSet
 
-       # Each caracter in the image
+       # Each character in the image
        # in left->right, then top->bottom order
        # Use space (' ') for holes in the tileset
        var chars: String
 
        # Additional space to insert horizontally between characters
-       # A negave value will display tile overlaped
-       var hspace: Int = 0 is writable
+       # A negative value will display tile overlapped
+       var hspace: Numeric = 0.0 is writable
 
        # Additional space to insert vertically between characters
-       # A negave value will display tile overlaped
-       var vspace: Int = 0 is writable
+       # A negative value will display tile overlapped
+       var vspace: Numeric = 0.0 is writable
 
-       # The glyph (tile) associated to the caracter `c` according to `chars`
+       # The glyph (tile) associated to the character `c` according to `chars`
        # Returns null if `c` is not in `chars`
        fun char(c: Char): nullable Image
        do
@@ -84,6 +84,30 @@ class TileSetFont
                if i == -1 then return null
                return subimages[i]
        end
+
+       # Distance between the beginning of a letter tile and the beginning of the next letter tile
+       fun advance: Numeric do return width.add(hspace)
+
+       # Distance between the beginning and the end of the longest line of `text`
+       fun text_width(text: String): Numeric
+       do
+               var lines = text.split('\n')
+               if lines.is_empty then return 0
+
+               var longest = 0
+               for line in lines do longest = longest.max(line.length)
+
+               return longest.mul(advance)
+       end
+
+       # Distance between the top of the first line to the bottom of the last line in `text`
+       fun text_height(text: Text): Numeric
+       do
+               if text.is_empty then return 0
+
+               var n_lines = text.chars.count('\n')
+               return (n_lines+1).mul(height.add(vspace)).sub(vspace)
+       end
 end
 
 redef class Display
@@ -91,10 +115,11 @@ redef class Display
        # '\n' are rendered as carriage return
        fun text(text: String, font: TileSetFont, x, y: Numeric)
        do
+               x = x.to_f
                var cx = x
-               var cy = y
-               var sw = font.width + font.hspace
-               var sh = font.height + font.vspace
+               var cy = y.to_f
+               var sw = font.width.to_f + font.hspace.to_f
+               var sh = font.height.to_f + font.vspace.to_f
                for c in text.chars do
                        if c == '\n' then
                                cx = x