--- /dev/null
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Abstract font drawing services, implemented by `bmfont` and `tileset`
+module font
+
+import flat
+
+# Abstract font, drawn by a `TextSprites`
+abstract class Font
+
+ # Line spacing modifier for `pld` and `plu`
+ #
+ # This value acts as multiplier to the standard line height.
+ # Defaults to 0.4, so a `pld` moves chars down by about half a line.
+ var partial_line_mod: Numeric = 0.4 is writable
+
+ # Backend writing service, clients should use `TextSprites.text=`
+ protected fun write_into(text_sprites: TextSprites, text: Text) is abstract
+end
+
+# Manage a set of sprites to display some text
+class TextSprites
+
+ # Font used to draw text
+ var font: Font
+
+ # Top left of the first character in UI coordinates
+ var anchor: Point3d[Float]
+
+ # Last set of sprites generated to display `text=`
+ var sprites = new Array[Sprite]
+
+ # Sprite set where to put created sprites
+ #
+ # Defaults to `app::ui_sprites`, but it could also be set to a
+ # `app::sprites` or a custom collection.
+ var target_sprite_set: Set[Sprite] = app.ui_sprites is lazy, writable
+
+ private var cached_text: nullable Text = ""
+
+ # Last text drawn
+ fun text: nullable Text do return cached_text
+
+ # Update the text displayed by inserting new sprites into `app.ui_sprites`
+ #
+ # Does not redraw if `text` has not changed.
+ fun text=(text: nullable Text)
+ is autoinit do
+ # Don't redraw if text hasn't changed
+ if text == cached_text then return
+ cached_text = text
+
+ # Clean up last used sprites
+ for s in sprites do if target_sprite_set.has(s) then target_sprite_set.remove s
+ sprites.clear
+
+ if text == null then return
+
+ font.write_into(self, text)
+
+ # Register sprites to be drawn by `app.ui_camera`
+ target_sprite_set.add_all sprites
+ end
+end
+
+# Partial line forward (U+008B)
+fun pld: Char do return '\8b'
+
+# Partial line backward (U+008C)
+fun plu: Char do return '\8c'
# Support for `TileSet`, `TileSetFont` and drawing text with `TextSprites`
module tileset
-import flat
+import font
# Efficiently retrieve tiles in a big texture
class TileSet
# A monospace bitmap font where glyphs are stored in a tileset
class TileSetFont
super TileSet
+ super Font
# Set the characters present in `texture`
#
# A negative value may display overlapped tiles.
var vspace: Numeric = 0.0 is writable
- # Line spacing modifier for `pld` and `plu`
- #
- # This value acts as multiplier to `height + vspace`.
- # Defaults to 0.4, so a `pld` moves chars down by about half a line.
- var partial_line_mod: Numeric = 0.4 is writable
-
# The glyph/tile/texture associated to `char`
#
# Returns null if `char` is not in `chars`.
var n_lines = text.chars.count('\n')
return (n_lines+1).mul(height.add(vspace)).sub(vspace)
end
-end
-
-# Manage a set of sprites to display some text
-class TextSprites
-
- # Font used to draw text
- var font: TileSetFont
-
- # Top left of the first character in UI coordinates
- var anchor: Point3d[Float]
-
- # Last set of sprites generated to display `text=`
- var sprites = new Array[Sprite]
-
- # Sprite set where to put created sprites
- #
- # Defaults to `app::ui_sprites`, but it could also be set to a
- # `app::sprites` or a custom collection.
- var target_sprite_set: Set[Sprite] = app.ui_sprites is lazy, writable
-
- private var cached_text: nullable Text = ""
-
- # Last text drawn
- fun text: nullable Text do return cached_text
-
- # Update the text displayed by inserting new sprites into `app.ui_sprites`
- #
- # Does not redraw if `text` has not changed.
- fun text=(text: nullable Text)
- is autoinit do
- # Don't redraw if text hasn't changed
- if text == cached_text then return
- cached_text = text
-
- # Clean up last used sprites
- for s in sprites do if target_sprite_set.has(s) then target_sprite_set.remove s
- sprites.clear
-
- if text == null then return
+ redef fun write_into(text_sprites, text)
+ do
# Build new sprites
- var dx = font.advance/2.0
- var dy = font.hspace.to_f/2.0
+ var dx = advance/2.0
+ var dy = hspace.to_f/2.0
for c in text do
if c == '\n' then
- dy -= font.height.to_f + font.vspace.to_f
- dx = font.advance/2.0
+ dy -= height.to_f + vspace.to_f
+ dx = advance/2.0
continue
else if c == pld then
- dy -= (font.height.to_f + font.vspace.to_f) * font.partial_line_mod.to_f
+ dy -= (height.to_f + vspace.to_f) * partial_line_mod.to_f
continue
else if c == plu then
- dy += (font.height.to_f + font.vspace.to_f) * font.partial_line_mod.to_f
+ dy += (height.to_f + vspace.to_f) * partial_line_mod.to_f
continue
else if c.is_whitespace then
- dx += font.advance
+ dx += advance
continue
end
- var tex = font.char(c)
+ var tex = char(c)
if tex == null then
# Try to fallback to '?'
- tex = font.char('?')
+ tex = char('?')
if tex == null then continue
end
- sprites.add new Sprite(tex, anchor.offset(dx, dy, 0))
- dx += font.advance
+ text_sprites.sprites.add new Sprite(tex, text_sprites.anchor.offset(dx, dy, 0))
+ dx += advance
end
-
- # Register sprites to be drawn by `app.ui_camera`
- target_sprite_set.add_all sprites
end
end
-
-# Partial line forward (U+008B)
-fun pld: Char do return '\8b'
-
-# Partial line backward (U+008C)
-fun plu: Char do return '\8c'
nitlanguage / nit.git / commitdiff