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-rw-r--r--src/Fl_Slider.cxx122
1 files changed, 107 insertions, 15 deletions
diff --git a/src/Fl_Slider.cxx b/src/Fl_Slider.cxx
index 077dbcd21..74fe98644 100644
--- a/src/Fl_Slider.cxx
+++ b/src/Fl_Slider.cxx
@@ -95,16 +95,18 @@ int Fl_Slider::scrollvalue(int pos, int size, int first, int total) {
// right (top) the left (bottom) edge is not all the way over, a
// position on the widget itself covers a wider range than 0-1,
// actually it ranges from 0 to 1/(1-size).
-
-void Fl_Slider::draw_bg(int X, int Y, int W, int H) {
+// S is the size of the slider knob
+void Fl_Slider::draw_bg(int X, int Y, int W, int H, int S) {
fl_push_clip(X, Y, W, H);
draw_box();
fl_pop_clip();
Fl_Color black = active_r() ? FL_FOREGROUND_COLOR : FL_INACTIVE_COLOR;
if (type() == FL_VERT_NICE_SLIDER) {
+ if (ticks()) draw_ticks(Fl_Rect { X, Y+S/2, W, H-S}, S);
draw_box(FL_THIN_DOWN_BOX, X+W/2-2, Y, 4, H, black);
} else if (type() == FL_HOR_NICE_SLIDER) {
+ if (ticks()) draw_ticks(Fl_Rect { X+S/2, Y, W-S, H}, S);
draw_box(FL_THIN_DOWN_BOX, X, Y+H/2-2, W, 4, black);
}
}
@@ -114,12 +116,9 @@ void Fl_Slider::draw(int X, int Y, int W, int H) {
double val;
if (minimum() == maximum())
val = 0.5;
- else {
- val = (value()-minimum())/(maximum()-minimum());
- if (val > 1.0) val = 1.0;
- else if (val < 0.0) val = 0.0;
- }
-
+ else
+ val = value_to_position(value());
+
int ww = (horizontal() ? W : H);
int xx, S;
if (type()==FL_HOR_FILL_SLIDER || type() == FL_VERT_FILL_SLIDER) {
@@ -146,7 +145,7 @@ void Fl_Slider::draw(int X, int Y, int W, int H) {
wsl = W;
}
- draw_bg(X, Y, W, H);
+ draw_bg(X, Y, W, H, S);
Fl_Boxtype box1 = slider();
if (!box1) {box1 = (Fl_Boxtype)(box()&-2); if (!box1) box1 = FL_UP_BOX;}
@@ -216,6 +215,39 @@ void Fl_Slider::draw() {
h()-Fl::box_dh(box()));
}
+/** Draw tick marks.
+ \param[in] r motion range of the slider
+ \param[in] S size of the slider, horizontal or vertical
+ */
+void Fl_Slider::draw_ticks(const Fl_Rect& r, int /*S*/ /*, int min_spacing*/)
+{
+ if ((ticks() == TICKS_NONE) || (num_ticks() == 0)) return;
+
+ Fl_Color black = active_r() ? FL_FOREGROUND_COLOR : FL_INACTIVE_COLOR;
+ fl_color(black);
+ int n = num_ticks();
+ double nd = (double)(n-1);
+ for (int i=0; i<n; i++) {
+ double v = i / nd;
+ if (scale() == LOG_SCALE) {
+ v = position_to_value(1.0-v);
+ v = (v - minimum()) / (maximum()-minimum());
+ }
+ if (horizontal()) {
+ int y1, y2;
+ if (ticks() & TICKS_ABOVE) y1 = r.y(); else y1 = r.y() + r.h()/2;
+ if (ticks() & TICKS_BELOW) y2 = r.b()-1; else y2 = r.y() + r.h()/2;
+ fl_yxline(r.r()-v*(r.w()-1)-1, y1, y2);
+ } else {
+ int x1, x2;
+ if (ticks() & TICKS_LEFT) x1 = r.x(); else x1 = r.x() + r.w()/2;
+ if (ticks() & TICKS_RIGHT) x2 = r.r()-1; else x2 = r.x() + r.w()/2;
+ fl_xyline(x1, r.b()-v*(r.h()-1)-1, x2);
+ }
+ }
+}
+
+
int Fl_Slider::handle(int event, int X, int Y, int W, int H) {
// Fl_Widget_Tracker wp(this);
switch (event) {
@@ -230,11 +262,8 @@ int Fl_Slider::handle(int event, int X, int Y, int W, int H) {
double val;
if (minimum() == maximum())
val = 0.5;
- else {
- val = (value()-minimum())/(maximum()-minimum());
- if (val > 1.0) val = 1.0;
- else if (val < 0.0) val = 0.0;
- }
+ else
+ val = value_to_position(value());
int ww = (horizontal() ? W : H);
int mx = (horizontal() ? Fl::event_x()-X : Fl::event_y()-Y);
@@ -279,7 +308,9 @@ int Fl_Slider::handle(int event, int X, int Y, int W, int H) {
xx = ww-S;
offcenter = mx-xx; if (offcenter > S) offcenter = S;
}
- v = round(xx*(maximum()-minimum())/(ww-S) + minimum());
+ // Convert position back to value using the appropriate scale
+ double pos = (ww-S) > 0 ? double(xx) / double(ww-S) : 0.0;
+ v = round(position_to_value(pos));
// make sure a click outside the sliderbar moves it:
if (event == FL_PUSH && v == value()) {
offcenter = S/2;
@@ -346,6 +377,7 @@ int Fl_Slider::handle(int event, int X, int Y, int W, int H) {
}
}
+
int Fl_Slider::handle(int event) {
if (event == FL_PUSH && Fl::visible_focus()) {
Fl::focus(this);
@@ -393,3 +425,63 @@ Fl_Nice_Slider::Fl_Nice_Slider(int X,int Y,int W,int H,const char *L)
type(FL_VERT_NICE_SLIDER);
box(FL_FLAT_BOX);
}
+
+/**
+ Converts a value to a normalized position (0.0 to 1.0) based on the current scale type.
+ For linear scale, this is a simple linear interpolation.
+ For logarithmic scale, this uses logarithmic interpolation.
+ \param[in] val The value to convert.
+ \return A normalized position between 0.0 and 1.0.
+*/
+double Fl_Slider::value_to_position(double val) const {
+ if (minimum() == maximum()) return 0.5;
+
+ if (scale_type_ == LOG_SCALE) {
+ // For logarithmic scale, both min and max must be positive
+ if (minimum() <= 0 || maximum() <= 0 || val <= 0) {
+ // Fall back to linear if values are not suitable for log scale
+ double pos = (val - minimum()) / (maximum() - minimum());
+ if (pos > 1.0) pos = 1.0;
+ else if (pos < 0.0) pos = 0.0;
+ return pos;
+ }
+ double log_min = log(minimum());
+ double log_max = log(maximum());
+ double log_val = log(val);
+ double pos = (log_val - log_min) / (log_max - log_min);
+ if (pos > 1.0) pos = 1.0;
+ else if (pos < 0.0) pos = 0.0;
+ return pos;
+ } else {
+ // Linear scale
+ double pos = (val - minimum()) / (maximum() - minimum());
+ if (pos > 1.0) pos = 1.0;
+ else if (pos < 0.0) pos = 0.0;
+ return pos;
+ }
+}
+
+/**
+ Converts a normalized position (0.0 to 1.0) to a value based on the current scale type.
+ For linear scale, this is a simple linear interpolation.
+ For logarithmic scale, this uses exponential interpolation.
+ \param[in] pos The normalized position to convert.
+ \return The corresponding value.
+*/
+double Fl_Slider::position_to_value(double pos) const {
+ if (minimum() == maximum()) return minimum();
+
+ if (scale_type_ == LOG_SCALE) {
+ // For logarithmic scale, both min and max must be positive
+ if (minimum() <= 0 || maximum() <= 0) {
+ // Fall back to linear if values are not suitable for log scale
+ return pos * (maximum() - minimum()) + minimum();
+ }
+ double log_min = log(minimum());
+ double log_max = log(maximum());
+ return exp(pos * (log_max - log_min) + log_min);
+ } else {
+ // Linear scale
+ return pos * (maximum() - minimum()) + minimum();
+ }
+}
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