Initial revision

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

1 files changed, 111 insertions, 0 deletions

diff --git a/src/Fl_Roller.cxx b/src/Fl_Roller.cxx
new file mode 100644
index 000000000..5e175385f
--- /dev/null
+++ b/src/Fl_Roller.cxx
@@ -0,0 +1,111 @@
+// Fl_Roller.C
+
+// Rapid-App style knob
+
+#include <FL/Fl.H>
+#include <FL/Fl_Roller.H>
+#include <FL/fl_draw.H>
+#include <math.h>
+
+int Fl_Roller::handle(int event) {
+  static int ipos;
+  int newpos = horizontal() ? Fl::event_x() : Fl::event_y();
+  switch (event) {
+  case FL_PUSH:
+    handle_push();
+    ipos = newpos;
+    return 1;
+  case FL_DRAG:
+    handle_drag(clamp(round(increment(previous_value(),newpos-ipos))));
+    return 1;
+  case FL_RELEASE:
+    handle_release();
+    return 1;
+  default:
+    return 0;
+  }
+}
+
+void Fl_Roller::draw() {
+  if (damage()&128) draw_box();
+  int X = x()+Fl::box_dx(box());
+  int Y = y()+Fl::box_dy(box());
+  int W = w()-Fl::box_dw(box())-1;
+  int H = h()-Fl::box_dh(box())-1;
+  int offset = step() ? int(value()/step()) : 0;
+  const double ARC = 1.5; // 1/2 the number of radians visible
+  const double delta = .2; // radians per knurl
+  if (horizontal()) { // horizontal one
+    // draw shaded ends of wheel:
+    int h1 = W/4+1; // distance from end that shading starts
+    fl_color(color()); fl_rectf(X+h1,Y,W-2*h1,H);
+    for (int i=0; h1; i++) {
+      fl_color((Fl_Color)(FL_GRAY-i-1));
+      int h2 = FL_GRAY-i-1 > FL_DARK3 ? 2*h1/3+1 : 0;
+      fl_rectf(X+h2,Y,h1-h2,H);
+      fl_rectf(X+W-h1,Y,h1-h2,H);
+      h1 = h2;
+    }
+    // draw ridges:
+    double junk;
+    for (double y = -ARC+modf(offset*sin(ARC)/(W/2)/delta,&junk)*delta;;
+	 y += delta) {
+      int y1 = int((sin(y)/sin(ARC)+1)*W/2);
+      if (y1 <= 0) continue; else if (y1 >= W-1) break;
+      fl_color(FL_DARK3); fl_yxline(X+y1,Y+1,Y+H-1);
+      if (y < 0) y1--; else y1++;
+      fl_color(FL_LIGHT1);fl_yxline(X+y1,Y+1,Y+H-1);
+    }
+    // draw edges:
+    h1 = W/8+1; // distance from end the color inverts
+    fl_color(FL_DARK2);
+    fl_xyline(X+h1,Y+H-1,X+W-h1);
+    fl_color(FL_DARK3);
+    fl_yxline(X,Y+H,Y,X+h1);
+    fl_xyline(X+W-h1,Y,X+W);
+    fl_color(FL_LIGHT2);
+    fl_xyline(X+h1,Y-1,X+W-h1);
+    fl_yxline(X+W,Y,Y+H,X+W-h1);
+    fl_xyline(X+h1,Y+H,X);
+  } else { // vertical one
+    // draw shaded ends of wheel:
+    int h1 = H/4+1; // distance from end that shading starts
+    fl_color(color()); fl_rectf(X,Y+h1,W,H-2*h1);
+    for (int i=0; h1; i++) {
+      fl_color((Fl_Color)(FL_GRAY-i-1));
+      int h2 = FL_GRAY-i-1 > FL_DARK3 ? 2*h1/3+1 : 0;
+      fl_rectf(X,Y+h2,W,h1-h2);
+      fl_rectf(X,Y+H-h1,W,h1-h2);
+      h1 = h2;
+    }
+    // draw ridges:
+    double junk;
+    for (double y = -ARC+modf(offset*sin(ARC)/(H/2)/delta,&junk)*delta;
+	 ; y += delta) {
+      int y1 = int((sin(y)/sin(ARC)+1)*H/2);
+      if (y1 <= 0) continue; else if (y1 >= H-1) break;
+      fl_color(FL_DARK3); fl_xyline(X+1,Y+y1,X+W-1);
+      if (y < 0) y1--; else y1++;
+      fl_color(FL_LIGHT1);fl_xyline(X+1,Y+y1,X+W-1);
+    }
+    // draw edges:
+    h1 = H/8+1; // distance from end the color inverts
+    fl_color(FL_DARK2);
+    fl_yxline(X+W-1,Y+h1,Y+H-h1);
+    fl_color(FL_DARK3);
+    fl_xyline(X+W,Y,X,Y+h1);
+    fl_yxline(X,Y+H-h1,Y+H);
+    fl_color(FL_LIGHT2);
+    fl_yxline(X,Y+h1,Y+H-h1);
+    fl_xyline(X,Y+H,X+W,Y+H-h1);
+    fl_yxline(X+W,Y+h1,Y);
+  }
+}
+
+Fl_Roller::Fl_Roller(int X,int Y,int W,int H,const char* L)
+  : Fl_Valuator(X,Y,W,H,L) {
+  box(FL_UP_FRAME);
+  step(1,1000);
+}
+
+// end of Fl_Roller.C