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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,
fn distance(a: u32, b: u32) u32 {
if (a > b) {
return a - b;
} else {
return b - a;
}
}
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);
const resolution = 1 + (
distance(self.start.x, self.end.x) + distance(self.start.y, self.end.y)
) / 8;
var last = self.start;
canvas.buffer[last.x + last.y * canvas.width] = .{ .red = 0xff, .green = 0xff, .blue = 0xff };
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)
));
const y: u32 = @intFromFloat(@round(
(1 - t) * ((1 - t) * start_y + t * middle_y) + t * ((1 - t) * middle_y + t * end_y)
));
(graphics.Line {
.start = .{ .x = last.x, .y = last.y },
.end = .{ .x = x, .y = y },
.color = self.color,
}).render(canvas);
last = .{ .x = x, .y = y };
}
}
};
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