add resize examples as per STR3433

add example code for creating images for resize.dox
based on Article #415: How does resizing work?
https://www.fltk.org/articles.php?L415

see also https://www.fltk.org/str.php?L3433

1 files changed, 59 insertions, 0 deletions

diff --git a/test/resize-arrows.cxx b/test/resize-arrows.cxx
new file mode 100644
index 000000000..5d48f1cec
--- /dev/null
+++ b/test/resize-arrows.cxx
@@ -0,0 +1,59 @@
+//
+// Resize example for use in the Fast Light Tool Kit (FLTK) documentation.
+//
+//     See Article #415: How does resizing work?
+//     https://www.fltk.org/articles.php?L415
+//
+// Copyright 1998-2020 by Bill Spitzak and others.
+//
+// This library is free software. Distribution and use rights are outlined in
+// the file "COPYING" which should have been included with this file.  If this
+// file is missing or damaged, see the license at:
+//
+//     https://www.fltk.org/COPYING.php
+//
+// Please see the following page on how to report bugs and issues:
+//
+//     https://www.fltk.org/bugs.php
+//
+
+#include "resize-arrows.h"
+#include <FL/fl_draw.H>
+
+Harrow::Harrow(int X, int Y, int W, int H, const char *T)
+  : Fl_Box(X, Y, W, H, T) {
+  align(FL_ALIGN_BOTTOM);
+  box(FL_NO_BOX);
+  color(FL_WHITE);
+}
+
+void Harrow::draw() {
+  Fl_Color old = fl_color();
+  int dx = 5, dy = 4;
+  int my = y() + h() / 2;
+  fl_rectf(x(), y(), w(), h(), FL_WHITE);
+  fl_color(FL_BLACK);
+  fl_polygon(x(), my, x() + dx, my - dy, x() + dx, my + dy);
+  fl_line(x() + dx, my, x() + w() - dx, my);
+  fl_polygon(x() + w(), my, x() + w() - dx, my + dy, x() + w() - dx, my - dy);
+  fl_color(old);
+}
+
+Varrow::Varrow(int X, int Y, int W, int H, const char *T)
+  : Fl_Box(X, Y, W, H, T) {
+  align(FL_ALIGN_RIGHT);
+  box(FL_NO_BOX);
+  color(FL_WHITE);
+}
+
+void Varrow::draw() {
+  Fl_Color old = fl_color();
+  int dx = 4, dy = 5;
+  int mx = x() + w() / 2;
+  fl_rectf(x(), y(), w(), h(), FL_WHITE);
+  fl_color(FL_BLACK);
+  fl_polygon(mx - dx, y() + dy, mx, y(), mx + dx, y() + dy);
+  fl_line(mx, y() + dy, mx, y() + h() - dy);
+  fl_polygon(mx - dx, y() + h() - dy, mx + dx, y() + h() - dy, mx, y() + h());
+  fl_color(old);
+}