From d716514c0c73914b519e1dc1d1a70c7d659dde34 Mon Sep 17 00:00:00 2001
From: Dmitry Sapozhnikov <11535558+o-sdn-o@users.noreply.github.com>
Date: Thu, 18 Apr 2024 16:16:31 +0500
Subject: [PATCH] #571 WIP: Change colors

---
 src/netxs/desktopio/canvas.hpp | 16 +++++++++++++++-
 src/netxs/desktopio/gui.h      | 19 +++++++++++++++----
 src/netxs/desktopio/system.hpp |  2 +-
 3 files changed, 31 insertions(+), 6 deletions(-)

diff --git a/src/netxs/desktopio/canvas.hpp b/src/netxs/desktopio/canvas.hpp
index fa3252cca1..987073a737 100644
--- a/src/netxs/desktopio/canvas.hpp
+++ b/src/netxs/desktopio/canvas.hpp
@@ -191,9 +191,15 @@ namespace netxs
             return chan.a && chan.a != 0xFF;
         }
         // argb: Set alpha channel.
-        void alpha(si32 k)
+        auto& alpha(si32 k)
         {
             chan.a = (byte)k;
+            return *this;
+        }
+        auto& alpha(fp32 k)
+        {
+            chan.a = (byte)std::clamp(k * 255.f, 0.f, 255.f);
+            return *this;
         }
         // argb: Return alpha channel.
         auto alpha() const
@@ -298,6 +304,14 @@ namespace netxs
                          (c2.chan.b * level + c1.chan.b * inverse) >> 8,
                          (c2.chan.a * level + c1.chan.a * inverse) >> 8 };
         }
+        static auto transit(argb c1, argb c2, fp32 level)
+        {
+            auto inverse = 1.f - level;
+            return argb{ (byte)std::clamp(c2.chan.r * level + c1.chan.r * inverse, 0.f, 255.f),
+                         (byte)std::clamp(c2.chan.g * level + c1.chan.g * inverse, 0.f, 255.f),
+                         (byte)std::clamp(c2.chan.b * level + c1.chan.b * inverse, 0.f, 255.f),
+                         (byte)std::clamp(c2.chan.a * level + c1.chan.a * inverse, 0.f, 255.f) };
+        }
         // argb: Alpha blending ARGB colors.
         void inline mix(argb c, si32 alpha)
         {
diff --git a/src/netxs/desktopio/gui.h b/src/netxs/desktopio/gui.h
index 6141c93e1e..9ad9e214c0 100644
--- a/src/netxs/desktopio/gui.h
+++ b/src/netxs/desktopio/gui.h
@@ -582,12 +582,23 @@ namespace netxs::gui
             //auto fx_black = [](auto& c){ c = 0xFF'00'00'00; };
             //auto fx_blue  = [](auto& c){ c = 0xFF'00'00'7f; };
             canvas.step(-inner_rect.coor);
+            auto rtc = argb{ tint::pureblue  }.alpha(0.5f);
+            auto ltc = argb{ tint::pureblack };
+            auto rbc = argb{ tint::pureblack };
+            auto lbc = argb{ tint::pureblue  }.alpha(0.5f);
             for (c.coor.y = 0; c.coor.y < inner_rect.size.y; c.coor.y += cell_size.y)
-            for (c.coor.x = 0; c.coor.x < inner_rect.size.x; c.coor.x += cell_size.x)
             {
-                netxs::onrect(canvas, c, fx_blue);
-                netxs::misc::cage(canvas, c, lt, fx_white2);
-                netxs::misc::cage(canvas, c, rb, fx_black2);
+                auto y = (fp32)c.coor.y / (inner_rect.size.y - 1);
+                auto lc = argb::transit(ltc, lbc, y);
+                auto rc = argb::transit(rtc, rbc, y);
+                for (c.coor.x = 0; c.coor.x < inner_rect.size.x; c.coor.x += cell_size.x)
+                {
+                    auto x = (fp32)c.coor.x / (inner_rect.size.x - 1);
+                    auto p = argb::transit(lc, rc, x);
+                    netxs::onrect(canvas, c, [&](auto& c){ c = p; });
+                    //netxs::misc::cage(canvas, c, lt, fx_white2);
+                    //netxs::misc::cage(canvas, c, rb, fx_black2);
+                }
             }
 
             //auto c1 = rect{ dot_00, inner_rect.size - dent{ 0, inner_rect.size.x / 2, 0, 0 }};
diff --git a/src/netxs/desktopio/system.hpp b/src/netxs/desktopio/system.hpp
index 8a70a01810..cd274b995f 100644
--- a/src/netxs/desktopio/system.hpp
+++ b/src/netxs/desktopio/system.hpp
@@ -5734,7 +5734,7 @@ namespace netxs::os
         {
             #if defined(WIN32)
                 using window = gui::window<gui::w32renderer>;
-                if (auto w = window{{{ 200, 200 }, { 40, 10 }}, { 11, 22 }})
+                if (auto w = window{{{ 200, 200 }, { 80, 20 }}, { 11, 22 }})
                 {
                     w.show();
                     w.dispatch();