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Diffstat (limited to 'src/gui/dimension_indicator.rs')
| -rw-r--r-- | src/gui/dimension_indicator.rs | 304 |
1 files changed, 0 insertions, 304 deletions
diff --git a/src/gui/dimension_indicator.rs b/src/gui/dimension_indicator.rs deleted file mode 100644 index 57f5bcc..0000000 --- a/src/gui/dimension_indicator.rs +++ /dev/null @@ -1,304 +0,0 @@ -//! An interface element that shows the size of the selected map items and provides a means to -//! manually change the size of them in a precise manner should need be. - -use crate::colours::DEFAULT_COLOURS; -use crate::map::Map; -use crate::math::{self, Rect, Vec2}; -use crate::transform::Transform; -use nalgebra::{Matrix3, Vector2}; -use raylib::drawing::RaylibDraw; -use raylib::ffi::KeyboardKey; -use raylib::RaylibHandle; - -/// A state the [DimensionIndicator] is currently in. This determines the behaviour of it and what -/// inputs it might be waiting for. -enum State { - /// In this state, the indicator is not trying to read any keyboard input, but will instead watch - /// for any changes to the dimensions from a different source, updating its display. - Watching, - /// In this state, the indicator will capture keyboard input and attempt to set the dimensions - /// according to whatever was entered. If the dimensions cannot be set, the indicator will use - /// the last valid dimensions. - Ruling { - dim_x: String, - dim_y: String, - editing_x: bool, - }, -} - -/// Used to render the horizontal and vertical dimensions of whatever is selected on the map and, if -/// the user so desires edit them directly by entering values into it. -pub struct DimensionIndicator { - /// The [State] the dimension indicator is currently in. - state: State, - /// The last dimensions that were valid. - bounds: Rect<f64>, -} - -impl Default for State { - fn default() -> Self { - Self::Watching - } -} - -impl Default for DimensionIndicator { - fn default() -> Self { - Self { - state: State::default(), - bounds: Rect::new(0., 0., 0., 0.), - } - } -} - -impl DimensionIndicator { - /// Create a new dimension indicator. While it is possible to have multiple instances, this is - /// not generally recommended, since they will need to be managed carefully or otherwise steal - /// keystrokes from each other. - pub fn new() -> Self { - Self::default() - } - - /// Update whatever is selected on the map according to the dimension indicator rules and rulers. - pub fn update(&mut self, map: &mut Map, rl: &mut RaylibHandle) { - match self.state { - State::Watching => self.update_watching(map, rl), - State::Ruling { .. } => self.update_ruling(map, rl), - }; - } - - fn update_watching(&mut self, map: &Map, rl: &RaylibHandle) { - let mut min: Vec2<f64> = Vec2::default(); - let mut max: Vec2<f64> = Vec2::default(); - - /* Try to find selected items. If no items exist, the dimension indicator is set to its - * default, otherwise it is adjusted to the size of the combined selection. - */ - let mut selection_exists = false; - for e in map.elements() { - if e.selected() { - let element_bounds = e.bounding_rect(); - if selection_exists { - // Adjust the currently detected selection size. - min.x = math::partial_min(min.x, element_bounds.x); - min.y = math::partial_min(min.y, element_bounds.y); - max.x = math::partial_max(max.x, element_bounds.x + element_bounds.w); - max.y = math::partial_max(max.y, element_bounds.y + element_bounds.h); - } else { - // No selection size detected yet. Set now. - min.x = element_bounds.x; - min.y = element_bounds.y; - max.x = element_bounds.x + element_bounds.w; - max.y = element_bounds.y + element_bounds.h; - } - selection_exists = true; - } - } - - // Set the current selection limits, if any. - self.bounds = if selection_exists { - Rect::bounding_rect(min, max) - } else { - Rect::new(0., 0., 0., 0.) - }; - - // Check if the user wants to change into editing mode, which the user can only do if there - // is a selection to begin with. - if selection_exists && rl.is_key_pressed(KeyboardKey::KEY_TAB) { - self.state = State::Ruling { - dim_x: self.bounds.w.to_string(), - dim_y: self.bounds.h.to_string(), - editing_x: true, - }; - } - } - - fn update_ruling(&mut self, map: &mut Map, rl: &mut RaylibHandle) { - // Get the currently edited dimension for processing. - let (edited_dim, editing_x) = match &mut self.state { - State::Watching => panic!("Called ruler update when in watching state"), - State::Ruling { - dim_x, - dim_y, - editing_x, - } => { - if *editing_x { - (dim_x, editing_x) - } else { - (dim_y, editing_x) - } - } - }; - - // Switch the currently edited dimension when pressing tab. - if rl.is_key_pressed(KeyboardKey::KEY_TAB) { - *editing_x = !*editing_x; - return; - } - // Finish editing mode on enter. - if rl.is_key_pressed(KeyboardKey::KEY_ENTER) { - self.state = State::Watching; - return; - } - - // Marker to see if the dimensions will have to be checked for an update. - let mut dimension_changed = false; - // Delete the last character of the dimension on backspace. - if rl.is_key_pressed(KeyboardKey::KEY_BACKSPACE) { - edited_dim.pop(); - dimension_changed = true; - } - /* Capture the current key and try to add it to the string of the current dimension, - * if possible. - */ - else if let Some(key) = rl.get_key_pressed() { - match key { - // Add a decimal point to the dimension if possible. - KeyboardKey::KEY_PERIOD => { - if !edited_dim.contains('.') { - edited_dim.push('.'); - } - // Nothing changed here, since there is an implicit .0 at the end. - } - // Handle the entered key if it is a number to append it to the currently edited dimension. - _ => { - if key as u16 >= KeyboardKey::KEY_ZERO as u16 - && key as u16 <= KeyboardKey::KEY_NINE as u16 - { - edited_dim.push(key as u8 as char); - dimension_changed = true; - } - } - }; - } - - if dimension_changed { - /* Try to parse the dimension from the currently edited string. If it - * is valid, change the dimensions of the currently selected items. If - * not, ignore the change and wait for a valid dimension. - */ - if let Ok(dim) = edited_dim.parse::<f64>() { - let new_bounds = if *editing_x { - Rect::new(self.bounds.x, self.bounds.y, dim, self.bounds.h) - } else { - Rect::new(self.bounds.x, self.bounds.y, self.bounds.h, dim) - }; - - self.set_bounds(map, new_bounds); - } - } - } - - /// Set the selection boundaries to the given bounds. Tries to transform the - /// currently selected items in the map so they fit inside of the new bounding box. - /// - /// # Panics - /// If the `bounds` have a negative value for width or height, the dimensions - /// cannot be set and the function will panic. - pub fn set_bounds(&mut self, map: &mut Map, bounds: Rect<f64>) { - if bounds.w <= 0. || bounds.h <= 0. { - panic!("Cannot set dimensions of elements to zero."); - } - - // If the bounds are the same as before, there is nothing to do. - if self.bounds == bounds { - return; - } - - /* Create a matrix to transform from the current rectangle bounds into the - * new bounds. Internally, this is a three-step process. First, we - * translate the points currently in the bounding box to the origin - * (0, 0) origin vector of the map, then scale and finally move it to the - * origin of the new rectangle. This needs to be applied to all vertices - * of all elements that can be scaled. - */ - let scale = Vector2::new(bounds.w / self.bounds.w, bounds.h / self.bounds.h); - let transform = Matrix3::new_translation(&Vector2::new(-self.bounds.x, -self.bounds.y)) - .append_nonuniform_scaling(&scale) - .append_translation(&Vector2::new(bounds.x, bounds.y)); - - for element in map.elements_mut() { - if element.selected() { - if let Some(transformable) = element.as_non_rigid_mut() { - transformable.apply_matrix(&transform); - } - } - } - - self.bounds = bounds; - } - - /// Draw the dimensions detected on the current selection. - pub fn draw(&self, rld: &mut impl RaylibDraw, transform: &Transform) { - /* Ignore a selection that has no non-null dimensions, since this usually - * indicates that there is nothing to be scaled. - */ - if self.bounds.w == 0. && self.bounds.h == 0. { - return; - } - - let (dim_str_width, dim_str_height) = match &self.state { - State::Watching => (self.bounds.w.to_string(), self.bounds.h.to_string()), - State::Ruling { dim_x, dim_y, .. } => (dim_x.clone(), dim_y.clone()), - }; - - // Draw the horizontal dimension at the bottom and the vertical dimension to the right. - // Use the valid dimensions, but show the edited dimensions in the String (should they differ) - let top_right = Vec2::new(self.bounds.x + self.bounds.w, self.bounds.y); - let bot_left = Vec2::new(self.bounds.x, self.bounds.y + self.bounds.h); - let bot_right = Vec2::new(self.bounds.x + self.bounds.w, self.bounds.y + self.bounds.h); - let dimensions = [ - (bot_left, bot_right, dim_str_width), - (bot_right, top_right, dim_str_height), - ]; - for (start, end, dim_str) in &dimensions { - // Don't draw anything if the length is zero. - if start == end { - continue; - } - - /* Get the vector that is perpendicular and points right/down from the line, assuming - * the lines prefer left as start over right and bottom over top. - */ - let line_normal = { - // Start with the direction of the line vector. - let dir = *start - *end; - // Calculate perpendicular vec and normalise. - dir.rotated_90_clockwise() / dir.length() - }; - - // To not have the line directly in the rect, move start and end outside a bit. - let start_px = transform.point_m_to_px(start) + line_normal * 10.; - let end_px = transform.point_m_to_px(end) + line_normal * 10.; - - /* Draw the indicator line, with stubs at both ends. */ - // First the two stubs. - rld.draw_line_ex( - start_px - line_normal * 5., - start_px + line_normal * 5., - 2., - DEFAULT_COLOURS.dimension_indicators, - ); - rld.draw_line_ex( - end_px - line_normal * 5., - end_px + line_normal * 5., - 2., - DEFAULT_COLOURS.dimension_indicators, - ); - // Then the actual indicator line. - rld.draw_line_ex(start_px, end_px, 2., DEFAULT_COLOURS.dimension_indicators); - - /* Draw the indicator text showing how long this line is in meters. - * It should be placed in the middle of the line, but not into the line directly, so it - * will be moved out by the normal. - */ - let text_pos = transform.point_m_to_px(&((*end + *start) / 2.)) + line_normal * 20.; - rld.draw_text( - &format!("{}m", dim_str), - text_pos.x as i32, - text_pos.y as i32, - 20, - DEFAULT_COLOURS.dimension_text, - ); - } - } -} |