/* Part of XPCE --- The SWI-Prolog GUI toolkit Author: Jan Wielemaker and Anjo Anjewierden E-mail: jan@swi.psy.uva.nl WWW: http://www.swi.psy.uva.nl/projects/xpce/ Copyright (c) 2001-2011, University of Amsterdam All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ :- module(plot_axis, []). :- use_module(library(pce)). :- require([ ceiling/2 , forall/2 , round/2 ]). /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - This library defines class plot_axis, an axis used for plotting graphs or barcharts. Normally this library is used in combination with the library('plot/plotter'), but it can also be used stand-alone. For example: ?- send(new(P, picture), open), send(P, display, plot_axis(x, 0, 100, @default, 400, point(40, 320))), send(P, display, plot_axis(y, 0, 500, @default, 300, point(40, 320))). - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */ :- pce_begin_class(plot_axis(type, low, high), line, "Coordinate system axis"). class_variable(tag_font, font, normal, "Font for values"). :- pce_group(attributes). variable(origin, point, get, "Location of the origin"). variable(low, 'int|real', get, "Low end of the range"). variable(high, 'int|real', get, "High end of the range"). variable(step, 'int|real', get, "Indication steps"). variable(small_step, 'int|real*', get, "Unnumbered indication steps"). variable(length, int, get, "Total length"). variable(scale, {linear,log} := linear, get, "Type of scale"). variable(type, {x,y}, get, "Horizontal/vertical"). variable(value_format, [name], get, "Value format specification"). variable(label, graphical*, get, "Label along the axis"). variable(lines, {none,normal,all} := normal, get, "Draw support lines"). :- pce_group(internal). variable(support, chain, none, "Supporting graphicals"). :- pce_group(@default). initialise(A, Type:'type={x,y}', Low:'low=int|real', High:'high=int|real', Step:step=[int|real], Length:length=[int], O:'origin=[point]') :-> "Create from low, high, step, length and type":: default(Length, 200, Len), ( Step == @default -> get(A, scale, Scale), determine_steps(Scale, Low, High, Length, Type, TheStep, SmallStep) ; TheStep = Step, SmallStep = @nil ), send_super(A, initialise), send(A, slot, origin, new(P, point)), ( O \== @default -> send(P, copy, O) ; true ), send(A, slot, low, Low), send(A, slot, high, High), send(A, slot, length, Len), send(A, slot, small_step, SmallStep), send(A, slot, step, TheStep), send(A, slot, type, Type), send(A, slot, support, new(chain)), send(A, slot, value_format, @default), send(A, request_compute). determine_steps(linear, Low, High, Len, XY, Step, SmallStep) :- Step0 is 10**round(log10(High-Low)-1), Dist is Len/((High-Low)/Step0), ( okdist(XY, Dist) -> Step = Step0, SmallStep = @nil ; Step is Step0*5, SmallStep = Step0 ). determine_steps(log, Low, High, Len, XY, Step, SmallStep) :- H is log10(High), L is log10(Low), determine_steps(linear, L, H, Len, XY, Step, SmallStep). okdist(x, Dist) :- Dist > 50. okdist(y, Dist) :- Dist > 25. unlink(A) :-> "Delete all <-support objects":: get(A, slot, support, Support), send(Support, for_all, message(@arg1, free)), send_super(A, unlink). device(A, Dev:device*) :-> "Trap device changes":: get(A, slot, support, Support), send(Support, for_all, message(@arg1, device, Dev)), ( get(A, label, Label), Label \== @nil -> send(Label, device, Dev) ; true ), send_super(A, device, Dev). /******************************* * USER COMPUTATION * *******************************/ :- pce_group(compute). location(A, Val:'int|real', Loc:int) :<- "Location for value":: catch(loc(A, Val, Loc), _, fail). value_from_coordinate(A, Loc:int, Val:'int|real') :<- "Translate location into value":: catch(loc(A, Val, Loc), _, fail). pixel_range(A, Tuple:tuple) :<- "Pixel range covered":: get(A, length, L), get(A, origin, point(OX, OY)), ( get(A, type, x) -> Min is OX, Max is OX + L ; Min is OY, Max is OY - L ), new(Tuple, tuple(Min,Max)). /******************************* * SLOT CHANGES * *******************************/ :- pce_group(update). changed(A) :-> "A has changed: force update":: send(A, request_compute). :- pce_group(@default). origin(A, P:point) :-> send(A?origin, copy, P), send(A, changed). label(A, L:graphical*) :-> set(A, label, L). low(A, L:'int|real') :-> set(A, low, L). high(A, L:'int|real') :-> set(A, high, L). step(A, L:'int|real') :-> set(A, step, L). small_step(A, L:'int|real*') :-> set(A, small_step, L). length(A, Length:int) :-> set(A, length, Length). type(A, T:{x,y}) :-> set(A, type, T). format(A, Fmt:[name]) :-> set(A, value_format, Fmt). lines(A, Lines:{none,normal,all}) :-> set(A, lines, Lines). scale(A, Scale:{linear,log}) :-> set(A, scale, Scale). set(A, Slot, Value) :- get(A, Slot, Value), !. set(A, Slot, Value) :- send(A, slot, Slot, Value), send(A, changed). default_steps(A) :-> "Determine default steps from other fields":: get(A, low, Low), get(A, high, High), get(A, length, Length), get(A, type, Type), get(A, scale, Scale), determine_steps(Scale, Low, High, Length, Type, Step, SmallStep), send(A, step, Step), send(A, small_step, SmallStep). geometry(A, X:[int], Y:[int], W:[int], H:[int]) :-> "Trap geometry changes":: ( get(A, request_compute, computing) -> send_super(A, geometry, X, Y, W, H) ; ( get(A, type, x) -> send_super(A, geometry, X, Y, W, @default), send(A, length, A?width) ; send_super(A, geometry, X, Y, @default, H), send(A, length, -A?height) ) ). /******************************* * COMPUTING * *******************************/ % loc(+Axis, ?Value, ?Coordinate) % % Translate between Value and Coordinate. loc(A, V, X) :- get(A, scale, linear), % Linear scales !, get(A, origin, O), get(A, type, T), get(O, T, Origin), get(A, length, Length), get(A, low, Low), get(A, high, High), ( T == x -> ( nonvar(V) -> X is round(Origin + ((V-Low) * Length) / (High - Low)) ; V is Low + (X-Origin) * (High-Low)/Length ) ; ( nonvar(V) -> X is round(Origin - ((V-Low) * Length) / (High - Low)) ; V is Low + (Origin-X) * (High-Low)/Length % not tested ) ). loc(A, V, X) :- get(A, scale, log), % Logarithmic scales !, get(A, origin, O), get(A, type, T), get(O, T, Origin), get(A, length, Length), get(A, low, LowVal), get(A, high, HighVal), Low is log10(LowVal), High is log10(HighVal), ( T == x -> ( nonvar(V) -> X is round(Origin + ((log10(V)-Low) * Length) / (High - Low)) ; V is 10**(Low + (X-Origin) * (High-Low)/Length) ) ; ( nonvar(V) -> X is round(Origin - ((log10(V)-Low) * Length) / (High - Low)) ; V is 10**(Low + (Origin-X) * (High-Low)/Length) % not tested ) ). tick(linear, Low, High, Step, Tick) :- TheLow is Low - Step / 10000, TheHigh is High + Step / 10000, % avoid floating point rounding L0 is ceil(TheLow/Step) * Step, tick_(L0, TheHigh, Step, Tick). tick(log, Low, High, Step, Tick) :- logtick(Low, High, Step, Tick). tick_(L, _, _, L). tick_(L, H, S, V) :- L1 is L + S, L1 =< H, tick_(L1, H, S, V). logtick(L, _, _, L). logtick(L, H, S, V) :- L1 is L*S, L1 =< H, logtick(L1, H, S, V). format(A, Fmt:[char_array]) :<- "Compute format to use":: ( get(A, slot, value_format, SlotValue), SlotValue \== @default -> Fmt = SlotValue ; get(A, step, Step), integer(Step), !, Fmt = '%d' ; get(A, step, Step), new(S, string('%f', Step)), new(Re, regex('\\..*[^0]')), send(Re, search, S), get(Re, register_end, End), get(Re, register_start, Start), send(Re, done), AfterDot is End - Start - 1, % 1 for the dot new(Fmt, string('%%.%df', AfterDot)) ). compute_small_steps(A) :-> get(A, small_step, SmallStep), ( SmallStep \== @nil -> get(A, low, Low), get(A, high, High), get(A, step, Step), get(A, device, Dev), get(A, origin, point(OX, OY)), get(A, slot, support, Support), get(A, scale, Scale), lines_extend(A, small, LStart, LEnd), ( get(A, type, x) -> ( tick(Scale, Low, High, SmallStep, TV), ( Val is TV / Step, integer(Val) -> true ; loc(A, TV, TX), send(Dev, display, new(L, line(TX, OY, TX, OY+3))), send(Support, append, L), ( LStart \== LEnd -> send(Dev, display, new(SL, line(TX, LStart, TX, LEnd))), send(SL, texture, dotted), send(SL, colour, grey50), send(Support, append, SL) ; true ) ), fail ; true ) ; ( tick(Scale, Low, High, SmallStep, TV), ( Val is TV / Step, integer(Val) -> true ; loc(A, TV, TY), send(Dev, display, new(L, line(OX-3, TY, OX, TY))), send(Support, append, L), ( LStart \== LEnd -> send(Dev, display, new(SL, line(LStart, TY, LEnd, TY))), send(SL, texture, dotted), send(SL, colour, grey50), send(Support, append, SL) ; true ) ), fail ; true ) ) ; true ). place_label(_, @nil, _, _, _) :- !. place_label(Dev, Label, Dir, X, Y) :- get(Label, size, size(W, H)), ( Dir == x -> send(Label, do_set, X-W, Y-H-3) ; send(Label, do_set, X+3, Y) ), send(Dev, display, Label). lines_extend(A, Which, Min, Max) :- get(A, lines, Lines), ( ( Which == normal, Lines \= none -> true ; Which == small, Lines == all ), get(A, device, Dev), ( get(A, type, y) -> get(Dev, pixel_range, x, tuple(Min, Max)) ; get(Dev, pixel_range, y, tuple(Min, Max)) ) -> true ; Min = 0, Max = 0 ). label_for_value(A, Val:'int|real', Gr:graphical) :<- "Compute a label for a value":: get(A, format, Fmt), get(A, tag_font, Font), new(Gr, text(string(Fmt, Val), font := Font)). compute(A) :-> \+ get(A, slot, request_compute, computing), % avoid cycles send(A, slot, request_compute, computing), get(A, low, Low), get(A, high, High), get(A, step, Step), get(A, scale, Scale), get(A, origin, point(OX, OY)), get(A, slot, support, Support), get(A, label, Label), send(Support, for_all, message(@arg1, free)), send(Support, clear), lines_extend(A, normal, LStart, LEnd), send(A, compute_small_steps), loc(A, Low, Start), loc(A, High, End), get(A, device, Dev), ( get(A, type, x) -> send(A, points, Start, OY, End, OY), OY5 is OY+5, place_label(Dev, Label, x, End, OY), ( tick(Scale, Low, High, Step, TV), ( catch(loc(A, TV, TX), _, fail), send(Dev, display, new(L, line(TX, OY, TX, OY5))), get(A, label_for_value, TV, Tag), send(Dev, display, Tag, point(TX-3, OY5)), ( LStart \== LEnd -> send(Dev, display, new(SL, line(TX, LStart, TX, LEnd))), send(SL, texture, dotted), send(Support, append, SL) ; true ), send(Support, append, L), send(Support, append, Tag) ), fail ; true ) ; send(A, points, OX, Start, OX, End), OX5 is OX-5, place_label(Dev, Label, y, OX, End), ( tick(Scale, Low, High, Step, TV), ( catch(loc(A, TV, TY), _, fail), send(Dev, display, new(L, line(OX5, TY, OX, TY))), get(A, label_for_value, TV, Tag), get(Tag, width, TW), get(Tag, height, TH), TxtX is OX5-TW, TxtY is TY -TH + 3, send(Tag, set, TxtX, TxtY), send(Dev, display, Tag), ( LStart \== LEnd -> send(Dev, display, new(SL, line(LStart, TY, LEnd, TY))), send(SL, texture, dotted), send(Support, append, SL) ; true ), send(Support, append, L), send(Support, append, Tag) ), fail ; true ) ), ( send(Dev, has_send_method, modified_plot_axis) -> send(Dev, modified_plot_axis, A) ; true ), send_super(A, compute). :- pce_end_class. /******************************* * RULER * *******************************/ :- pce_begin_class(plot_ruler, device, "Show X/Y value of point"). variable(value, real, get, "Displayed value"). variable(value_format, name := '%g', both, "Format used for values"). initialise(R) :-> send_super(R, initialise), send(R, display, new(L, line)), send(L, texture, dotted), send(R, display, new(T, text(0))), send(T, border, 3), send(T, background, navajo_white), send(R, slot, value, 0). attach(R, Axis:axis=plot_axis, Value:real, Length:length=[int]) :-> send(R, detach), get(R, member, line, Line), get(R, member, text, Text), get(Axis, device, Plotter), get(Axis, format, Format), send(R, slot, value_format, Format), ( get(Axis, type, x) % X-axis -> send(Text, format, center), send(Text, center_x, 0), get(Axis, y, Bottom), send(R, y, Bottom), ( Length == @default -> get(Plotter, y_axis, YAxis), get(YAxis, length, Len) ; Len = Length ), send(Line, points, 0, 5, 0, -Len), send(Text, y, 5) ; send(Text, format, right), % Y-axis send(Text, center_y, 0), get(Axis, x, Left), send(R, x, Left), ( Length == @default -> get(Plotter, x_axis, XAxis), get(XAxis, length, Right) ; Right = Length ), send(Line, points, -5, 0, Right, 0), send(Text, x, -5-Text?width) ), send(Plotter, display, R), new(_, hyper(Axis, R, rules, axis)), send(R, value, Value). detach(R) :-> send(R, delete_hypers, axis), send(R, device, @nil). value(R, Val:real) :-> send(R, slot, value, Val), send(R, request_compute, value). compute(R) :-> ( get(R, request_compute, value), send(R, slot, request_compute, @default), get(R, hypered, axis, Axis), get(R, device, Plotter), Plotter \== @nil -> get(R, value, Value), ( get(Axis, type, x) -> get(Plotter, translate_x, Value, X), send(R, x, X) ; get(Plotter, translate_y, Value, Y), send(R, y, Y) ), get(R, member, text, Text), get(R, value_format, Format), send(Text, string, string(Format, Value)) ; true ), send_super(R, compute). :- pce_end_class.