Class: AnsiSys::Cursor

Inherits:
Object
  • Object
show all
Defined in:
lib/ansisys.rb

Constant Summary collapse

CODE_LETTERS =

Escape sequence codes processed in this Class

%w(A B C D E F G H f)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(cur_col = 1, cur_row = 1, max_col = 80, max_row = 25) ⇒ Cursor

Returns a new instance of Cursor.



159
160
161
162
163
164
 
# File 'lib/ansisys.rb', line 159

def initialize(cur_col = 1, cur_row = 1, max_col = 80, max_row = 25)
	@cur_col = cur_col
	@cur_row = cur_row
	@max_col = max_col
	@max_row = max_row
end

Instance Attribute Details

#cur_col ⇒ Object (readonly)

current column number (1-)



154
155
156
 
# File 'lib/ansisys.rb', line 154

def cur_col
  @cur_col
end

#cur_row ⇒ Object (readonly)

current row number (1-)



155
156
157
 
# File 'lib/ansisys.rb', line 155

def cur_row
  @cur_row
end

#max_col ⇒ Object

maximum column number



156
157
158
 
# File 'lib/ansisys.rb', line 156

def max_col
  @max_col
end

#max_row ⇒ Object

maximum row number



157
158
159
 
# File 'lib/ansisys.rb', line 157

def max_row
  @max_row
end

Instance Method Details

#advance!(width = 1) ⇒ Object

changes current location for a character with width to be echoed



211
212
213
214
215
216
217
218
219
 
# File 'lib/ansisys.rb', line 211

def advance!(width = 1)
	r = nil
	@cur_col += width
	if @cur_col > @max_col
		line_feed!
		r = "\n"
	end
	return r
end

#apply_code!(letter, *pars) ⇒ Object

applies self an escape sequence code that ends with letter as String and with some pars as Integers



168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
 
# File 'lib/ansisys.rb', line 168

def apply_code!(letter, *pars)
	case letter
	when 'A'
		@cur_row -= pars[0] ? pars[0] : 1
		@cur_row = @max_row if @max_row and @cur_row > @max_row
	when 'B'
		@cur_row += pars[0] ? pars[0] : 1
		@cur_row = @max_row if @max_row and @cur_row > @max_row
	when 'C'
		@cur_col += pars[0] ? pars[0] : 1
	when 'D'
		@cur_col -= pars[0] ? pars[0] : 1
	when 'E'
		@cur_row += pars[0] ? pars[0] : 1
		@cur_col = 1
		@max_row = @cur_row if @max_row and @cur_row > @max_row
	when 'F'
		@cur_row -= pars[0] ? pars[0] : 1
		@cur_col = 1
		@max_row = @cur_row if @max_row and @cur_row > @max_row
	when 'G'
		@cur_col = pars[0] ? pars[0] : 1
	when 'H'
		@cur_row = pars[0] ? pars[0] : 1
		@cur_col = pars[1] ? pars[1] : 1
		@max_row = @cur_row if @max_row and @cur_row > @max_row
	when 'f'
		@cur_row = pars[0] ? pars[0] : 1
		@cur_col = pars[1] ? pars[1] : 1
		@max_row = @cur_row if @max_row and @cur_row > @max_row
	end
	if @cur_row < 1
		@cur_row = 1
	end
	if @cur_col < 1
		@cur_col = 1
	elsif @cur_col > @max_col
		@cur_col = @max_col
	end
	return self
end

#fit!(width = 1) ⇒ Object

check if a character with width fits within the maximum columns, feed a line if not



223
224
225
226
227
228
229
230
 
# File 'lib/ansisys.rb', line 223

def fit!(width = 1)
	r = nil
	if @cur_col + width > @max_col + 1
		line_feed!
		r = "\n"
	end
	return r
end

#line_feed! ⇒ Object

feed a line



233
234
235
236
237
 
# File 'lib/ansisys.rb', line 233

def line_feed!
	@cur_col = 1
	@cur_row += 1
	@max_row = @cur_row if @max_row and @cur_row > @max_row
end