Jakub Kotur | 251cc39 | 2020-12-21 17:28:15 +0100 | [diff] [blame] | 1 | use crate::{BackendCoord, BackendStyle, DrawingBackend, DrawingErrorKind}; |
| 2 | |
| 3 | pub fn draw_rect<B: DrawingBackend, S: BackendStyle>( |
| 4 | b: &mut B, |
| 5 | upper_left: BackendCoord, |
| 6 | bottom_right: BackendCoord, |
| 7 | style: &S, |
| 8 | fill: bool, |
| 9 | ) -> Result<(), DrawingErrorKind<B::ErrorType>> { |
| 10 | if style.color().alpha == 0.0 { |
| 11 | return Ok(()); |
| 12 | } |
| 13 | let (upper_left, bottom_right) = ( |
| 14 | ( |
| 15 | upper_left.0.min(bottom_right.0), |
| 16 | upper_left.1.min(bottom_right.1), |
| 17 | ), |
| 18 | ( |
| 19 | upper_left.0.max(bottom_right.0), |
| 20 | upper_left.1.max(bottom_right.1), |
| 21 | ), |
| 22 | ); |
| 23 | |
| 24 | if fill { |
| 25 | if bottom_right.0 - upper_left.0 < bottom_right.1 - upper_left.1 { |
| 26 | for x in upper_left.0..=bottom_right.0 { |
| 27 | check_result!(b.draw_line((x, upper_left.1), (x, bottom_right.1), style)); |
| 28 | } |
| 29 | } else { |
| 30 | for y in upper_left.1..=bottom_right.1 { |
| 31 | check_result!(b.draw_line((upper_left.0, y), (bottom_right.0, y), style)); |
| 32 | } |
| 33 | } |
| 34 | } else { |
| 35 | b.draw_line( |
| 36 | (upper_left.0, upper_left.1), |
| 37 | (upper_left.0, bottom_right.1), |
| 38 | style, |
| 39 | )?; |
| 40 | b.draw_line( |
| 41 | (upper_left.0, upper_left.1), |
| 42 | (bottom_right.0, upper_left.1), |
| 43 | style, |
| 44 | )?; |
| 45 | b.draw_line( |
| 46 | (bottom_right.0, bottom_right.1), |
| 47 | (upper_left.0, bottom_right.1), |
| 48 | style, |
| 49 | )?; |
| 50 | b.draw_line( |
| 51 | (bottom_right.0, bottom_right.1), |
| 52 | (bottom_right.0, upper_left.1), |
| 53 | style, |
| 54 | )?; |
| 55 | } |
| 56 | Ok(()) |
| 57 | } |