| 1 | //! Rectangle tool - draw rectangles. |
| 2 | |
| 3 | use super::Tool; |
| 4 | use crate::annotate::state::ToolProperties; |
| 5 | use gartk_core::{InputEvent, MouseButton, Point, Rect}; |
| 6 | use gartk_render::cairo::Context; |
| 7 | use gartk_render::{fill_rect, stroke_rect}; |
| 8 | use gartk_x11::CursorShape; |
| 9 | |
| 10 | /// Rectangle drawing tool. |
| 11 | pub struct RectangleTool { |
| 12 | /// Starting corner of the rectangle. |
| 13 | start: Option<Point>, |
| 14 | /// Opposite corner of the rectangle. |
| 15 | end: Option<Point>, |
| 16 | /// Whether we're currently drawing. |
| 17 | drawing: bool, |
| 18 | } |
| 19 | |
| 20 | impl RectangleTool { |
| 21 | /// Create a new rectangle tool. |
| 22 | pub fn new() -> Self { |
| 23 | Self { |
| 24 | start: None, |
| 25 | end: None, |
| 26 | drawing: false, |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | /// Calculate normalized rectangle from start and end points. |
| 31 | fn calculate_rect(&self) -> Option<Rect> { |
| 32 | let (start, end) = (self.start?, self.end?); |
| 33 | |
| 34 | let x = start.x.min(end.x); |
| 35 | let y = start.y.min(end.y); |
| 36 | let width = (end.x - start.x).unsigned_abs(); |
| 37 | let height = (end.y - start.y).unsigned_abs(); |
| 38 | |
| 39 | if width > 0 && height > 0 { |
| 40 | Some(Rect::new(x, y, width, height)) |
| 41 | } else { |
| 42 | None |
| 43 | } |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | impl Default for RectangleTool { |
| 48 | fn default() -> Self { |
| 49 | Self::new() |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | impl Tool for RectangleTool { |
| 54 | fn handle_event(&mut self, event: &InputEvent, _props: &ToolProperties) -> bool { |
| 55 | match event { |
| 56 | InputEvent::MousePress(e) if e.button == Some(MouseButton::Left) => { |
| 57 | self.start = Some(e.position); |
| 58 | self.end = Some(e.position); |
| 59 | self.drawing = true; |
| 60 | true |
| 61 | } |
| 62 | InputEvent::MouseMove(e) if self.drawing => { |
| 63 | self.end = Some(e.position); |
| 64 | true |
| 65 | } |
| 66 | InputEvent::MouseRelease(e) if e.button == Some(MouseButton::Left) && self.drawing => { |
| 67 | self.end = Some(e.position); |
| 68 | self.drawing = false; |
| 69 | true |
| 70 | } |
| 71 | _ => false, |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | fn draw_preview(&self, ctx: &Context, props: &ToolProperties) { |
| 76 | if let Some(rect) = self.calculate_rect() { |
| 77 | if props.fill { |
| 78 | fill_rect(ctx, rect, props.color); |
| 79 | } else { |
| 80 | stroke_rect(ctx, rect, props.color, props.line_width); |
| 81 | } |
| 82 | } |
| 83 | } |
| 84 | |
| 85 | fn commit(&self, ctx: &Context, props: &ToolProperties) { |
| 86 | self.draw_preview(ctx, props); |
| 87 | } |
| 88 | |
| 89 | fn reset(&mut self) { |
| 90 | self.start = None; |
| 91 | self.end = None; |
| 92 | self.drawing = false; |
| 93 | } |
| 94 | |
| 95 | fn cursor(&self) -> CursorShape { |
| 96 | CursorShape::Crosshair |
| 97 | } |
| 98 | |
| 99 | fn is_drawing(&self) -> bool { |
| 100 | self.drawing |
| 101 | } |
| 102 | |
| 103 | fn can_commit(&self) -> bool { |
| 104 | self.calculate_rect().is_some() |
| 105 | } |
| 106 | } |
| 107 |