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Improved line_style test program to draw an optional 1-pixel line drawing

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over the existing one to be able to see the real coordinates of the lines.
With line width > 1 and different colors it is now possible to see and
compare line offsets to the left/right/top/bottom of lines.

This has been inspired by the discussion in fltk.general, see link:
http://www.fltk.org/newsgroups.php?gfltk.general+v:27131


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@6595 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Albrecht Schlosser
2008-12-21 13:48:14 +00:00
parent ac4edf2aed
commit 0aacaeb2c2
1 changed files with 34 additions and 15 deletions
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test/line_style.cxx
+34 -15
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@@ -3,7 +3,7 @@
//
// Line style demo for the Fast Light Tool Kit (FLTK).
//
// Copyright 2000-2005 by Bill Spitzak and others.
// Copyright 2000-2008 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
@@ -30,10 +30,13 @@
#include <FL/Fl_Value_Slider.H>
#include <FL/fl_draw.H>
#include <FL/Fl_Choice.H>
#include <FL/Fl_Check_Button.H>
#include <FL/Fl_Box.H>
Fl_Window *form;
Fl_Slider *sliders[8];
Fl_Choice *choice[3];
Fl_Check_Button *draw_line;
class test_box: public Fl_Window {
void draw();
@@ -59,15 +62,22 @@ void test_box::draw() {
(long)(choice[2]->mvalue()->user_data()),
(long)(sliders[3]->value()),
buf);
fl_rect(10,10,w()-20,h()-20);
fl_begin_line();
fl_vertex(35, 35);
fl_vertex(w()-35, h()-35);
fl_vertex(w()-40, 35);
fl_vertex(35, h()/2);
fl_end_line();
// you must reset the line type when done:
fl_line_style(FL_SOLID);
// draw the defined fl_rect and fl_vertex first and then
// the additional one-pixel line, if enabled
for (int i=0; i<(draw_line->value()?2:1); i++) {
fl_rect(10,10,w()-20,h()-20);
fl_begin_line();
fl_vertex(35, 35);
fl_vertex(w()-35, h()-35);
fl_vertex(w()-40, 35);
fl_vertex(35, h()/2);
fl_end_line();
// you must reset the line type when done:
fl_line_style(FL_SOLID);
fl_color(FL_BLACK);
}
}
Fl_Menu_Item style_menu[] = {
@@ -101,11 +111,12 @@ void do_redraw(Fl_Widget*,void*)
}
void makeform(const char *) {
form = new Fl_Window(500,210,"fl_line_style() test");
form = new Fl_Window(500,230,"fl_line_style() test");
sliders[0]= new Fl_Value_Slider(280,10,180,20,"R");
sliders[0]->bounds(0,255);
sliders[1]= new Fl_Value_Slider(280,30,180,20,"G");
sliders[1]->bounds(0,255);
sliders[1]->value(255);
sliders[2]= new Fl_Value_Slider(280,50,180,20,"B");
sliders[2]->bounds(0,255);
choice[0]= new Fl_Choice(280,70,180,20,"Style");
@@ -116,14 +127,17 @@ void makeform(const char *) {
choice[2]->menu(join_menu);
sliders[3]= new Fl_Value_Slider(280,130,180,20,"Width");
sliders[3]->bounds(0,20);
sliders[4] = new Fl_Slider(200,170,70,20,"Dash");
draw_line = new Fl_Check_Button(280,150,20,20,"Line");
draw_line->align(FL_ALIGN_LEFT);
new Fl_Box (300,150,160,20,"adds a 1-pixel black line");
sliders[4] = new Fl_Slider(200,190,70,20,"Dash");
sliders[4]->align(FL_ALIGN_TOP_LEFT);
sliders[4]->bounds(0,40);
sliders[5] = new Fl_Slider(270,170,70,20);
sliders[5] = new Fl_Slider(270,190,70,20);
sliders[5]->bounds(0,40);
sliders[6] = new Fl_Slider(340,170,70,20);
sliders[6] = new Fl_Slider(340,190,70,20);
sliders[6]->bounds(0,40);
sliders[7] = new Fl_Slider(410,170,70,20);
sliders[7] = new Fl_Slider(410,190,70,20);
sliders[7]->bounds(0,40);
int i;
for (i=0;i<8;i++) {
@@ -132,6 +146,11 @@ void makeform(const char *) {
sliders[i]->callback((Fl_Callback*)do_redraw);
sliders[i]->step(1);
}
sliders[0]->value(255); // R
sliders[1]->value(100); // G
sliders[2]->value(100); // B
draw_line->value(0);
draw_line->callback((Fl_Callback*)do_redraw);
for (i=0;i<3;i++) {
choice[i]->value(0);
choice[i]->callback((Fl_Callback*)do_redraw);