graphics: add line

1 files changed, 36 insertions, 0 deletions

diff --git a/src/estd/graphics/curve.zig b/src/estd/graphics/curve.zig
new file mode 100644
index 0000000..d4be1d7
--- /dev/null
+++ b/src/estd/graphics/curve.zig
@@ -0,0 +1,36 @@
+const std = @import("std");
+const graphics = @import("root.zig");
+
+pub const Curve = struct {
+	const Self = @This();
+	const Point = struct {
+		x: u32,
+		y: u32,
+	};
+
+	start: Point,
+	middle: Point,
+	end: Point,
+
+	color: graphics.Color,
+
+	pub fn render(self: *const Self, canvas: *const graphics.Canvas) void {
+		const start_x: f64 = @floatFromInt(self.start.x);
+		const start_y: f64 = @floatFromInt(self.start.y);
+		const middle_x: f64 = @floatFromInt(self.middle.x);
+		const middle_y: f64 = @floatFromInt(self.middle.y);
+		const end_x: f64 = @floatFromInt(self.end.x);
+		const end_y: f64 = @floatFromInt(self.end.y);
+
+		for (0..100) |index| {
+			const t: f64 = @as(f64, @floatFromInt(index)) / 100;
+			const x: u32 = @intFromFloat(@round(
+				(1 - t) * ((1 - t) * start_x + t * middle_x) + t * ((1 - t) * middle_x + t * end_x)
+			));
+			const y: u32 = @intFromFloat(@round(
+				(1 - t) * ((1 - t) * start_y + t * middle_y) + t * ((1 - t) * middle_y + t * end_y)
+			));
+			canvas.buffer[x + canvas.width * y] = self.color;
+		}
+	}
+};