shapes: draw_rectangle_ex

Author: GeezerLMAO

src/shapes.rs

@@ -3,7 +3,7 @@
 use crate::{color::Color, get_context};
 
 use crate::quad_gl::{DrawMode, Vertex};
-use glam::{vec2, Vec2};
+use glam::{vec2, vec3, vec4, Mat4, Vec2};
 
 /// Draws a solid triangle between points `v1`, `v2`, and `v3` with a given `color`.
 pub fn draw_triangle(v1: Vec2, v2: Vec2, v3: Vec2, color: Color) {
@@ -74,6 +74,59 @@ pub fn draw_rectangle_lines(x: f32, y: f32, w: f32, h: f32, thickness: f32, colo
     context.gl.geometry(&vertices, &indices);
 }
 
+#[derive(Debug, Clone)]
+pub struct DrawRectangleParams {
+    /// Adds an offset to the position
+    /// E.g. offset (0,0) positions the rectangle at the top left corner of the screen, while offset
+    /// (0.5, 0.5) centers it
+    pub offset: Vec2,
+
+    /// Rotation in radians
+    pub rotation: f32,
+
+    pub color: Color,
+}
+
+impl Default for DrawRectangleParams {
+    fn default() -> Self {
+        Self {
+            offset: vec2(0.0, 0.0),
+            rotation: 0.0,
+            color: Color::from_rgba(255, 255, 255, 255),
+        }
+    }
+}
+
+/// Draws a solid rectangle with its position at `[x, y]` with size `[w, h]`,
+/// with parameters.
+pub fn draw_rectangle_ex(x: f32, y: f32, w: f32, h: f32, params: DrawRectangleParams) {
+    let context = get_context();
+    let transform_matrix = Mat4::from_translation(vec3(x, y, 0.0))
+        * Mat4::from_axis_angle(vec3(0.0, 0.0, 1.0), params.rotation)
+        * Mat4::from_scale(vec3(w, h, 1.0));
+
+    #[rustfmt::skip]
+    let v = [
+        transform_matrix * vec4( 0.0 - params.offset.x,  0.0 - params.offset.y, 0.0, 1.0),
+        transform_matrix * vec4( 0.0 - params.offset.x,  1.0 - params.offset.y, 0.0, 1.0),
+        transform_matrix * vec4( 1.0 - params.offset.x,  1.0 - params.offset.y, 0.0, 1.0),
+        transform_matrix * vec4( 1.0 - params.offset.x,  0.0 - params.offset.y, 0.0, 1.0),
+    ];
+
+    #[rustfmt::skip]
+    let vertices = [
+        Vertex::new(v[0].x, v[0].y, v[0].z, 0.0, 1.0, params.color),
+        Vertex::new(v[1].x, v[1].y, v[1].z, 1.0, 0.0, params.color),
+        Vertex::new(v[2].x, v[2].y, v[2].z, 1.0, 1.0, params.color),
+        Vertex::new(v[3].x, v[3].y, v[3].z, 1.0, 0.0, params.color),
+    ];
+    let indices: [u16; 6] = [0, 1, 2, 0, 2, 3];
+
+    context.gl.texture(None);
+    context.gl.draw_mode(DrawMode::Triangles);
+    context.gl.geometry(&vertices, &indices);
+}
+
 /// Draws an outlined solid hexagon centered at `[x, y]` with a radius `size`, outline thickness
 /// defined by `border`, orientation defined by `vertical` (when `true`, the hexagon points along
 /// the `y` axis), and colors for outline given by `border_color` and fill by `fill_color`.