From cce1f768e7399b838a2b865511915bdd576dbbf4 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Sun, 23 Oct 2022 17:31:31 +0200
Subject: a

---
 editor/camera.cpp | 88 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 editor/camera.cpp

(limited to 'editor/camera.cpp')

diff --git a/editor/camera.cpp b/editor/camera.cpp
new file mode 100644
index 00000000..7af77211
--- /dev/null
+++ b/editor/camera.cpp
@@ -0,0 +1,88 @@
+#include "app.hpp"
+#include <Magnum/GL/DefaultFramebuffer.h>
+
+namespace floormat {
+
+void app::do_camera(double dt)
+{
+    if (keys[key::camera_reset])
+        reset_camera_offset();
+    else
+    {
+        Vector2d dir{};
+
+        if (keys[key::camera_up])
+            dir += Vector2d{0, -1};
+        else if (keys[key::camera_down])
+            dir += Vector2d{0,  1};
+        if (keys[key::camera_left])
+            dir += Vector2d{-1, 0};
+        else if (keys[key::camera_right])
+            dir += Vector2d{1,  0};
+
+        if (dir != Vector2d{})
+        {
+            constexpr double screens_per_second = 1;
+            const auto pixels_per_second = windowSize().length() / screens_per_second;
+            auto camera_offset = _shader.camera_offset();
+            const auto max_camera_offset = Vector2d(windowSize() * 10);
+
+            camera_offset -= dir.normalized() * dt * pixels_per_second;
+            camera_offset[0] = std::clamp(camera_offset[0], -max_camera_offset[0], max_camera_offset[0]);
+            camera_offset[1] = std::clamp(camera_offset[1], -max_camera_offset[1], max_camera_offset[1]);
+
+            _shader.set_camera_offset(camera_offset);
+        }
+        else
+            return;
+    }
+    recalc_cursor_tile();
+    if (_cursor_tile)
+        do_mouse_move(*_cursor_tile);
+}
+
+void app::reset_camera_offset()
+{
+    _shader.set_camera_offset(tile_shader::project({TILE_MAX_DIM*-.5*dTILE_SIZE[0], TILE_MAX_DIM*-.5*dTILE_SIZE[1], 0}));
+    recalc_cursor_tile();
+}
+
+void app::recalc_cursor_tile()
+{
+    if (_cursor_pixel && !_cursor_in_imgui)
+        _cursor_tile = pixel_to_tile(Vector2d(*_cursor_pixel));
+    else
+        _cursor_tile = std::nullopt;
+}
+
+global_coords app::pixel_to_tile(Vector2d position) const
+{
+    constexpr Vector2d pixel_size{dTILE_SIZE[0], dTILE_SIZE[1]};
+    constexpr Vector2d half{.5, .5};
+    const Vector2d px = position - Vector2d{windowSize()}*.5 - _shader.camera_offset()*.5;
+    const Vector2d vec = tile_shader::unproject(px) / pixel_size + half;
+    const auto x = (std::int32_t)std::floor(vec[0]), y = (std::int32_t)std::floor(vec[1]);
+    return { x, y };
+}
+
+std::array<std::int16_t, 4> app::get_draw_bounds() const noexcept
+{
+
+    using limits = std::numeric_limits<std::int16_t>;
+    auto x0 = limits::max(), x1 = limits::min(), y0 = limits::max(), y1 = limits::min();
+
+    for (const auto win = Vector2d(windowSize());
+         auto p : {pixel_to_tile(Vector2d{0, 0}).chunk(),
+                   pixel_to_tile(Vector2d{win[0]-1, 0}).chunk(),
+                   pixel_to_tile(Vector2d{0, win[1]-1}).chunk(),
+                   pixel_to_tile(Vector2d{win[0]-1, win[1]-1}).chunk()})
+    {
+        x0 = std::min(x0, p.x);
+        x1 = std::max(x1, p.x);
+        y0 = std::min(y0, p.y);
+        y1 = std::max(y1, p.y);
+    }
+    return {x0, x1, y0, y1};
+}
+
+} // namespace floormat
-- 
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