Initial revision

git-svn-id: file:///fltk/svn/fltk/trunk@2 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 106 insertions, 0 deletions

diff --git a/src/Fl_Positioner.cxx b/src/Fl_Positioner.cxx
new file mode 100644
index 000000000..017a4ef4d
--- /dev/null
+++ b/src/Fl_Positioner.cxx
@@ -0,0 +1,106 @@
+// Fl_Positioner.C
+
+// The positioner widget from Forms, gives 2D input
+// Written by: Mark Overmars
+
+#include <FL/Fl.H>
+#include <FL/Fl_Positioner.H>
+#include <FL/fl_draw.H>
+
+static double flinear(double val, double smin, double smax, double gmin, double gmax)
+{
+  if (smin == smax) return gmax;
+  else return gmin + (gmax - gmin) * (val - smin) / (smax - smin);
+}
+
+void Fl_Positioner::draw(int x, int y, int w, int h) {
+  int x1 = x + 4;
+  int y1 = y + 4;
+  int w1 = w - 2 * 4;
+  int h1 = h - 2 * 4;
+  int xx = int(flinear(xvalue(), xmin, xmax, x1, x1+w1-1)+.5);
+  int yy = int(flinear(yvalue(), ymin, ymax, y1, y1+h1-1)+.5);
+  draw_box(box(), x, y, w, h, color());
+  fl_color(selection_color());
+  fl_xyline(x1, yy, x1+w1);
+  fl_yxline(xx, y1, y1+h1);
+}
+
+void Fl_Positioner::draw() {
+  draw(x(), y(), w(), h());
+  draw_label();
+}
+
+int Fl_Positioner::value(double X, double Y) {
+  clear_changed();
+  if (X == xvalue_ && Y == yvalue_) return 0;
+  xvalue_ = X; yvalue_ = Y;
+  redraw();
+  return 1;
+}
+
+int Fl_Positioner::xvalue(double X) {
+  return(value(X, yvalue_));
+}
+
+int Fl_Positioner::yvalue(double Y) {
+  return(value(xvalue_, Y));
+}
+
+int Fl_Positioner::handle(int event, int x, int y, int w, int h) {
+  switch (event) {
+  case FL_PUSH:
+  case FL_DRAG:
+  case FL_RELEASE: {
+    double x1 = x + 4;
+    double y1 = y + 4;
+    double w1 = w - 2 * 4;
+    double h1 = h - 2 * 4;
+    double X = flinear(Fl::event_x(), x1, x1+w1-1.0, xmin, xmax);
+    if (xstep_) X = int(X/xstep_+0.5) * xstep_;
+    if (X < xmin) X = xmin;
+    if (X > xmax) X = xmax;
+    double Y = flinear(Fl::event_y(), y1, y1+h1-1.0, ymin, ymax);
+    if (ystep_) Y = int(Y/ystep_+0.5) * ystep_;
+    if (Y < ymin) Y = ymin;
+    if (Y > ymax) Y = ymax;
+    if (value(X, Y)) set_changed();}
+    if (!(when() & FL_WHEN_CHANGED ||
+	  when() & FL_WHEN_RELEASE && event == FL_RELEASE)) return 1;
+    if (changed() || when()&FL_WHEN_NOT_CHANGED) {
+      clear_changed(); do_callback();}
+    return 1;
+  default:
+    return 0;
+  }
+}
+
+int Fl_Positioner::handle(int e) {
+  return handle(e, x(), y(), w(), h());
+}
+
+Fl_Positioner::Fl_Positioner(int x, int y, int w, int h, const char* l)
+: Fl_Widget(x, y, w, h, l) {
+  box(FL_DOWN_BOX);
+  selection_color(FL_RED);
+  align(FL_ALIGN_BOTTOM);
+  when(FL_WHEN_CHANGED);
+  xmin = ymin = 0;
+  xmax = ymax = 1;
+  xvalue_ = yvalue_ = .5;
+  xstep_ = ystep_ = 0;
+}
+
+void Fl_Positioner::xbounds(double a, double b) {
+  if (a != xmin || b != xmax) {
+    xmin = a; xmax = b;
+    redraw();
+  }
+}
+
+void Fl_Positioner::ybounds(double a, double b) {
+  if (a != ymin || b != ymax) {
+    ymin = a; ymax = b;
+    redraw();
+  }
+}