From 183726aed4e498f9e527dcf3c92f7098dcaf73dc Mon Sep 17 00:00:00 2001
From: Roman Pytkov <mr.pytkov@gmail.com>
Date: Thu, 18 Dec 2025 22:24:30 +0300
Subject: [PATCH] =?UTF-8?q?=D0=93=D1=80=D0=B0=D0=B4=D0=B8=D0=B5=D0=BD?=
 =?UTF-8?q?=D1=82=20=D0=B2=D0=BC=D0=B5=D1=81=D1=82=D0=BE=20=D1=84=D0=B8?=
 =?UTF-8?q?=D0=B3=D0=BD=D0=B8=20=D0=BA=D0=B0=D0=BA=D0=BE=D0=B9=20=D1=82?=
 =?UTF-8?q?=D0=BE?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/Canvas.zig | 41 ++++++++++++++++-------------------------
 1 file changed, 16 insertions(+), 25 deletions(-)

diff --git a/src/Canvas.zig b/src/Canvas.zig
index 3e20140..6290175 100644
--- a/src/Canvas.zig
+++ b/src/Canvas.zig
@@ -26,37 +26,28 @@ pub fn deinit(self: *Canvas) void {
     }
 }
 
-/// Заполнить canvas случайным цветом на CPU
+/// Заполнить canvas градиентом
 pub fn fillRandomColor(self: *Canvas) !void {
-    var prng = std.Random.DefaultPrng.init(@intCast(std.time.microTimestamp()));
-    const random = prng.random();
-
     // Выделить буфер пиксельных данных
     const pixels = try self.allocator.alloc(Color.PMA, @as(usize, self.width) * self.height);
     defer self.allocator.free(pixels);
 
-    // Заполнить случайными цветами
-    const r = random.int(u8);
-    const g = random.int(u8);
-    const b = random.int(u8);
+    // Сгенерировать случайные цвета градиента
+    var prng = std.Random.DefaultPrng.init(@intCast(std.time.microTimestamp()));
+    const random = prng.random();
+    const start_color = Color.PMA{ .r = random.int(u8), .g = random.int(u8), .b = random.int(u8), .a = 255 };
+    const end_color = Color.PMA{ .r = random.int(u8), .g = random.int(u8), .b = random.int(u8), .a = 255 };
 
-    var prev: dvui.Color.PMA = .{ .r = r, .g = g, .b = b, .a = 255 };
-    for (pixels) |*pixel| {
-        const r_delta = random.intRangeAtMost(i16, -1, 1);
-        const g_delta = random.intRangeAtMost(i16, -1, 1);
-        const b_delta = random.intRangeAtMost(i16, -1, 1);
-
-        const r_new: i16 = @as(i16, prev.r) + r_delta;
-        const g_new: i16 = @as(i16, prev.g) + g_delta;
-        const b_new: i16 = @as(i16, prev.b) + b_delta;
-
-        pixel.* = .{
-            .r = @intCast(std.math.clamp(r_new, 0, 255)),
-            .g = @intCast(std.math.clamp(g_new, 0, 255)),
-            .b = @intCast(std.math.clamp(b_new, 0, 255)),
-            .a = 255,
-        };
-        prev = pixel.*;
+    var y: u32 = 0;
+    while (y < self.height) : (y += 1) {
+        var x: u32 = 0;
+        while (x < self.width) : (x += 1) {
+            const factor = @as(f32, @floatFromInt(x)) / @as(f32, @floatFromInt(self.width - 1));
+            const r = @as(u8, @intFromFloat(@as(f32, @floatFromInt(start_color.r)) + factor * (@as(f32, @floatFromInt(end_color.r)) - @as(f32, @floatFromInt(start_color.r)))));
+            const g = @as(u8, @intFromFloat(@as(f32, @floatFromInt(start_color.g)) + factor * (@as(f32, @floatFromInt(end_color.g)) - @as(f32, @floatFromInt(start_color.g)))));
+            const b = @as(u8, @intFromFloat(@as(f32, @floatFromInt(start_color.b)) + factor * (@as(f32, @floatFromInt(end_color.b)) - @as(f32, @floatFromInt(start_color.b)))));
+            pixels[y * self.width + x] = .{ .r = r, .g = g, .b = b, .a = 255 };
+        }
     }
 
     // Удалить старую текстуру