114 lines
2.9 KiB
C++
114 lines
2.9 KiB
C++
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// Fl_Dial.C
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// A circular dial control, like xv uses. From Forms.
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#include <FL/Fl.H>
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#include <FL/Fl_Dial.H>
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#include <FL/fl_draw.H>
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#include <stdlib.h>
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#include <FL/math.h>
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void Fl_Dial::draw(int x, int y, int w, int h) {
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if (damage()&128) draw_box(box(), x, y, w, h, color());
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x += Fl::box_dx(box());
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y += Fl::box_dy(box());
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w -= Fl::box_dw(box());
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h -= Fl::box_dh(box());
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double angle = 270.0*(value()-minimum())/(maximum()-minimum());
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if (type() == FL_FILL_DIAL) {
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double a = angle; if (a < 0) a = 0;
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// foo: draw this nicely in certain round box types
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int foo = (box() > _FL_ROUND_UP_BOX && Fl::box_dx(box()));
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if (foo) {x--; y--; w+=2; h+=2;}
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fl_color(color());
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fl_pie(x, y, w-1, h-1, 225, 225+360-a);
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fl_color(selection_color());
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fl_pie(x, y, w-1, h-1, 225-a, 225);
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if (foo) {
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fl_color(FL_BLACK);
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fl_arc(x, y, w, h, 0, 360);
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}
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return;
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}
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if (!(damage()&128)) {
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fl_color(color());
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fl_pie(x+1, y+1, w-2, h-2, 0, 360);
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}
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fl_push_matrix();
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fl_translate(x+w/2-.5, y+h/2-.5);
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fl_scale(w-1, h-1);
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if (type() == FL_FILL_DIAL) {
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fl_rotate(225);
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fl_begin_line(); fl_vertex(0, 0); fl_vertex(.5, 0); fl_end_line();
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}
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fl_rotate(-angle);
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fl_color(selection_color());
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if (type() == FL_LINE_DIAL) {
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fl_begin_polygon();
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fl_vertex(0.0, 0.0);
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fl_vertex(-0.04, 0.0);
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fl_vertex(-0.25, 0.25);
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fl_vertex(0.0, 0.04);
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fl_end_polygon();
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fl_color(FL_BLACK);
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fl_begin_loop();
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fl_vertex(0.0, 0.0);
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fl_vertex(-0.04, 0.0);
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fl_vertex(-0.25, 0.25);
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fl_vertex(0.0, 0.04);
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fl_end_loop();
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} else {
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fl_begin_polygon(); fl_circle(-0.20, 0.20, 0.07); fl_end_polygon();
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fl_color(FL_BLACK);
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fl_begin_loop(); fl_circle(-0.20, 0.20, 0.07); fl_end_loop();
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}
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fl_pop_matrix();
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}
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void Fl_Dial::draw() {
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draw(x(), y(), w(), h());
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draw_label();
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}
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int Fl_Dial::handle(int event, int x, int y, int w, int h) {
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switch (event) {
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case FL_PUSH:
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handle_push();
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case FL_DRAG: {
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double angle;
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double val = value();
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int mx = Fl::event_x()-x-w/2;
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int my = Fl::event_y()-y-h/2;
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if (!mx && !my) return 1;
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if (abs(mx) > abs(my)) {
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angle = atan(-(double)my/mx);
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if (mx>0) angle = 1.25*M_PI - angle;
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else angle = 0.25*M_PI - angle;
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} else {
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angle = atan(-(double)mx/my);
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if (my<0) angle = 0.75*M_PI + angle;
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else angle = -0.25*M_PI + angle;
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}
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if (angle<-0.25*M_PI) angle += 2.0*M_PI;
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val = minimum() + (maximum()-minimum())*angle/(1.5*M_PI);
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if (fabs(val-value()) < (maximum()-minimum())/2.0)
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handle_drag(clamp(round(val)));
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} return 1;
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case FL_RELEASE:
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handle_release();
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return 1;
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default:
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return 0;
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}
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}
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int Fl_Dial::handle(int e) {
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return handle(e, x(), y(), w(), h());
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}
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Fl_Dial::Fl_Dial(int x, int y, int w, int h, const char* l)
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: Fl_Valuator(x, y, w, h, l) {
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box(FL_OVAL_BOX);
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selection_color(FL_INACTIVE_COLOR); // was 37
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}
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