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| | 1 | +//! Line tool - draw straight lines. |
| | 2 | + |
| | 3 | +use super::Tool; |
| | 4 | +use crate::annotate::state::ToolProperties; |
| | 5 | +use gartk_core::{InputEvent, MouseButton, Point}; |
| | 6 | +use gartk_render::cairo::Context; |
| | 7 | +use gartk_render::line as draw_line; |
| | 8 | +use gartk_x11::CursorShape; |
| | 9 | + |
| | 10 | +/// Line drawing tool. |
| | 11 | +pub struct LineTool { |
| | 12 | + /// Starting point of the line. |
| | 13 | + start: Option<Point>, |
| | 14 | + /// Ending point of the line. |
| | 15 | + end: Option<Point>, |
| | 16 | + /// Whether we're currently drawing. |
| | 17 | + drawing: bool, |
| | 18 | +} |
| | 19 | + |
| | 20 | +impl LineTool { |
| | 21 | + /// Create a new line tool. |
| | 22 | + pub fn new() -> Self { |
| | 23 | + Self { |
| | 24 | + start: None, |
| | 25 | + end: None, |
| | 26 | + drawing: false, |
| | 27 | + } |
| | 28 | + } |
| | 29 | +} |
| | 30 | + |
| | 31 | +impl Default for LineTool { |
| | 32 | + fn default() -> Self { |
| | 33 | + Self::new() |
| | 34 | + } |
| | 35 | +} |
| | 36 | + |
| | 37 | +impl Tool for LineTool { |
| | 38 | + fn handle_event(&mut self, event: &InputEvent, _props: &ToolProperties) -> bool { |
| | 39 | + match event { |
| | 40 | + InputEvent::MousePress(e) if e.button == Some(MouseButton::Left) => { |
| | 41 | + self.start = Some(e.position); |
| | 42 | + self.end = Some(e.position); |
| | 43 | + self.drawing = true; |
| | 44 | + true |
| | 45 | + } |
| | 46 | + InputEvent::MouseMove(e) if self.drawing => { |
| | 47 | + self.end = Some(e.position); |
| | 48 | + true |
| | 49 | + } |
| | 50 | + InputEvent::MouseRelease(e) if e.button == Some(MouseButton::Left) && self.drawing => { |
| | 51 | + self.end = Some(e.position); |
| | 52 | + self.drawing = false; |
| | 53 | + true |
| | 54 | + } |
| | 55 | + _ => false, |
| | 56 | + } |
| | 57 | + } |
| | 58 | + |
| | 59 | + fn draw_preview(&self, ctx: &Context, props: &ToolProperties) { |
| | 60 | + if let (Some(start), Some(end)) = (self.start, self.end) { |
| | 61 | + draw_line( |
| | 62 | + ctx, |
| | 63 | + start.x as f64, |
| | 64 | + start.y as f64, |
| | 65 | + end.x as f64, |
| | 66 | + end.y as f64, |
| | 67 | + props.color, |
| | 68 | + props.line_width, |
| | 69 | + ); |
| | 70 | + } |
| | 71 | + } |
| | 72 | + |
| | 73 | + fn commit(&self, ctx: &Context, props: &ToolProperties) { |
| | 74 | + self.draw_preview(ctx, props); |
| | 75 | + } |
| | 76 | + |
| | 77 | + fn reset(&mut self) { |
| | 78 | + self.start = None; |
| | 79 | + self.end = None; |
| | 80 | + self.drawing = false; |
| | 81 | + } |
| | 82 | + |
| | 83 | + fn cursor(&self) -> CursorShape { |
| | 84 | + CursorShape::Crosshair |
| | 85 | + } |
| | 86 | + |
| | 87 | + fn is_drawing(&self) -> bool { |
| | 88 | + self.drawing |
| | 89 | + } |
| | 90 | + |
| | 91 | + fn can_commit(&self) -> bool { |
| | 92 | + if let (Some(start), Some(end)) = (self.start, self.end) { |
| | 93 | + // Line is valid if it has some length |
| | 94 | + start.x != end.x || start.y != end.y |
| | 95 | + } else { |
| | 96 | + false |
| | 97 | + } |
| | 98 | + } |
| | 99 | +} |