Added stem plots and legend entry hover checking

implot-examples/examples-shared/src/lib.rs

@@ -3,6 +3,7 @@ pub mod heatmaps;
 pub mod line_plots;
 pub mod scatter_plots;
 pub mod stairs_plots;
+mod stem_plots;
 pub mod text_plots;
 
 use imgui::{im_str, Condition, Ui, Window};
@@ -43,5 +44,9 @@ pub fn show_demos(ui: &Ui, plot_ui: &PlotUi) {
             ui.separator();
             ui.text(im_str!("Heatmaps:"));
             heatmaps::show_demo_headers(ui, plot_ui);
+
+            ui.separator();
+            ui.text(im_str!("Stem plots:"));
+            stem_plots::show_demo_headers(ui, plot_ui);
         });
 }

implot-examples/examples-shared/src/line_plots.rs

@@ -3,12 +3,12 @@
 
 use imgui::{im_str, CollapsingHeader, Condition, Ui};
 use implot::{
-    get_plot_limits, get_plot_mouse_position, get_plot_query, is_plot_hovered, is_plot_queried,
-    pixels_to_plot_vec2, plot_to_pixels_vec2, push_style_color, push_style_var_f32,
-    push_style_var_i32, set_colormap_from_preset, set_colormap_from_vec, set_plot_y_axis,
-    AxisFlags, Colormap, ImPlotLimits, ImPlotPoint, ImPlotRange, ImVec2, ImVec4, Marker, Plot,
-    PlotColorElement, PlotFlags, PlotLine, PlotLocation, PlotOrientation, PlotUi, StyleVar,
-    YAxisChoice,
+    get_plot_limits, get_plot_mouse_position, get_plot_query, is_legend_entry_hovered,
+    is_plot_hovered, is_plot_queried, pixels_to_plot_vec2, plot_to_pixels_vec2, push_style_color,
+    push_style_var_f32, push_style_var_i32, set_colormap_from_preset, set_colormap_from_vec,
+    set_plot_y_axis, AxisFlags, Colormap, ImPlotLimits, ImPlotPoint, ImPlotRange, ImVec2, ImVec4,
+    Marker, Plot, PlotColorElement, PlotFlags, PlotLine, PlotLocation, PlotOrientation, PlotUi,
+    StyleVar, YAxisChoice,
 };
 
 pub fn show_basic_plot(ui: &Ui, plot_ui: &PlotUi) {
@@ -156,6 +156,8 @@ pub fn show_query_features_plot(ui: &Ui, plot_ui: &PlotUi) {
     let mut hover_pos_from_pixels: Option<ImPlotPoint> = None;
     let mut plot_limits: Option<ImPlotLimits> = None;
     let mut query_limits: Option<ImPlotLimits> = None;
+    let mut legend1_hovered = false;
+    let mut legend2_hovered = false;
 
     // Draw a plot
     Plot::new("Plot querying")
@@ -183,6 +185,12 @@ pub fn show_query_features_plot(ui: &Ui, plot_ui: &PlotUi) {
                 None,
             ));
 
+            // Plot a line so we have a legend entry
+            PlotLine::new("Legend1").plot(&vec![2.0, 2.0], &vec![2.0, 1.0]);
+            PlotLine::new("Legend2").plot(&vec![0.0, 0.0], &vec![1.0, 1.0]);
+            legend1_hovered = is_legend_entry_hovered("Legend1");
+            legend2_hovered = is_legend_entry_hovered("Legend2");
+
             if is_plot_queried() {
                 query_limits = Some(get_plot_query(None));
             }
@@ -214,6 +222,11 @@ pub fn show_query_features_plot(ui: &Ui, plot_ui: &PlotUi) {
     if let Some(query) = query_limits {
         ui.text(im_str!("Query limits are {:#?}", query));
     }
+    ui.text(im_str!(
+        "Legend hovering - 1: {}, 2: {}",
+        legend1_hovered,
+        legend2_hovered
+    ));
 
     // Try out converting pixel position to plot position
     if let Some(pos) = hover_pos_from_pixels {

implot-examples/examples-shared/src/stem_plots.rs

@@ -0,0 +1,28 @@
+//! This example demonstrates how stem plots are to be used. For more general
+//! features of the libray, see the line_plots example.
+
+use imgui::{im_str, CollapsingHeader, Ui};
+use implot::{Plot, PlotStems, PlotUi};
+
+pub fn show_basic_plot(ui: &Ui, plot_ui: &PlotUi) {
+    ui.text(im_str!("This header shows a simple stem plot."));
+    let content_width = ui.window_content_region_width();
+    Plot::new("Stem plot")
+        // The size call could also be omitted, though the defaults don't consider window
+        // width, which is why we're not doing so here.
+        .size(content_width, 300.0)
+        .build(plot_ui, || {
+            // If this is called outside a plot build callback, the program will panic.
+            let axis_positions = vec![0.2, 0.4, 0.6, 0.8, 0.9, 0.93];
+            let values = vec![0.1, 0.2, 0.3, 0.4, 0.3, 0.8];
+            PlotStems::new("legend label")
+                .with_reference_y(0.1)
+                .plot(&axis_positions, &values);
+        });
+}
+
+pub fn show_demo_headers(ui: &Ui, plot_ui: &PlotUi) {
+    if CollapsingHeader::new(im_str!("Stem plots")).build(&ui) {
+        show_basic_plot(&ui, &plot_ui);
+    }
+}