From 40b847344481803e94e78ba2dacde8dc78636948 Mon Sep 17 00:00:00 2001
From: Nathan Reiner <nathan@nathanreiner.xyz>
Date: Fri, 14 Feb 2025 16:51:07 +0100
Subject: graphics: make curve more smooth

---
 src/estd/graphics/curve.zig |  4 ++--
 src/screen/main.zig         | 32 +++++++++++++++++++++-----------
 2 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/src/estd/graphics/curve.zig b/src/estd/graphics/curve.zig
index 70569a3..6c591fa 100644
--- a/src/estd/graphics/curve.zig
+++ b/src/estd/graphics/curve.zig
@@ -29,7 +29,7 @@ pub const Curve = struct {
 		const middle_y: f64 = @floatFromInt(self.middle.y);
 		const end_x: f64 = @floatFromInt(self.end.x);
 		const end_y: f64 = @floatFromInt(self.end.y);
-		const resolution = 2 + (
+		const resolution = 1 + (
 			distance(self.start.x, self.end.x) + distance(self.start.y, self.end.y)
 		) / 8;
 
@@ -37,7 +37,7 @@ pub const Curve = struct {
 
 		canvas.buffer[last.x + last.y * canvas.width] = .{ .red = 0xff, .green = 0xff, .blue = 0xff };
 
-		for (1..resolution) |index| {
+		for (1..resolution + 1) |index| {
 			const t: f64 = @as(f64, @floatFromInt(index)) / @as(f64, @floatFromInt(resolution));
 			const x: u32 = @intFromFloat(@round(
 				(1 - t) * ((1 - t) * start_x + t * middle_x) + t * ((1 - t) * middle_x + t * end_x)
diff --git a/src/screen/main.zig b/src/screen/main.zig
index 0ee7e17..2387f57 100644
--- a/src/screen/main.zig
+++ b/src/screen/main.zig
@@ -33,30 +33,40 @@ pub fn main() !void {
 
 	var curve = graphics.Curve {
 		.start = .{ .x = center_x, .y = center_y },
-		.middle = .{ .x = center_x, .y = center_y + 150 },
-		.end = .{ .x = center_x + 110 , .y = center_y + 100  },
+		.middle = .{ .x = center_x + 200, .y = center_y - 150 },
+		.end = .{ .x = center_x + 100 , .y = center_y + 100  },
 		.color = .{ .red = 0xff, .green = 0, .blue = 0 },
 	};
 
 	var last_duration: f64 = 0;
 	var delta: f64 = 0;
+	var angle: f64 = 0;
 
 	while (true) {
 		const start = try std.time.Instant.now();
 		const canvas = buffer.canvas();
 
-		canvas.fill(.{ .red = 0x5, .green = 0x5, .blue = 0x5 });
+		canvas.fill(.{ .red = 0x25, .green = 0x25, .blue = 0x25 });
 
-		//(graphics.Box {
-		//	.x = center_x - 100,
-		//	.y = center_y - 100,
-		//	.width = 200,
-		//	.height = 200,
-		//	.radius = 100,
-		//	.color = .{ .red = 0xff, .green = 0xff, .blue = 0xff },
-		//}).render(&canvas);
+		(graphics.Box {
+			.x = center_x - 100,
+			.y = center_y - 100,
+			.width = 200,
+			.height = 200,
+			.radius = 100,
+			.color = .{ .red = 0xff, .green = 0xff, .blue = 0xff },
+		}).render(&canvas);
 
 		curve.render(&canvas);
+		const cos = @cos(std.math.degreesToRadians(angle));
+		const sin = @sin(std.math.degreesToRadians(angle));
+		curve.end.x = @intCast(@as(i64, @intCast(center_x)) + @as(i64, @intFromFloat(100 * cos)));
+		curve.end.y = @intCast(@as(i64, @intCast(center_y)) + @as(i64, @intFromFloat(100 * sin)));
+
+		angle += delta;
+		if (angle > 360) {
+			angle = 0;
+		}
 
 		const end = try std.time.Instant.now();
 		const duration: f64 = @floatFromInt(end.since(start));
-- 
cgit v1.2.3-70-g09d2