handle mouse events

Signed-off-by: Peter Siegmund <developer@mars3142.org>

src/ui/widgets/D_Pad.cpp

@@ -1,24 +1,82 @@
+#include "D_Pad.h"
 #include "ui/widgets/D_Pad.h"
 
 #include "ResourceManager.h"
 
-D_Pad::D_Pad(
-    void* appState,
-    const float x,
-    const float y,
-    const float width,
-    std::function<void(int)> callback)
-    : UIWidget(appState)
-    , m_x(x)
-    , m_y(y)
-    , m_width(width)
-    , m_callback(std::move(callback)) {
+D_Pad::D_Pad(void *appState, const float x, const float y, const float width, std::function<void(Direction)> callback)
+    : UIWidget(appState), m_x(x), m_y(y), m_width(width), m_callback(std::move(callback))
+{
 }
 
-void D_Pad::render() const {
-    const auto dPad = ResourceManager::getInstance().get_texture(
-        get_context()->renderer(), "assets/d-pad_normal.png");
+void D_Pad::Render() const
+{
+    const auto dPad =
+        ResourceManager::Instance().GetTextureByName(GetContext()->MainRenderer(), "d-pad_normal.png");
 
     const auto dst = SDL_FRect(m_x, m_y, m_width, m_width);
-    SDL_RenderTexture(get_context()->renderer(), dPad, nullptr, &dst);
+    SDL_RenderTexture(GetContext()->MainRenderer(), dPad, nullptr, &dst);
 }
+
+bool D_Pad::IsHit(const int mouse_x, const int mouse_y) const
+{
+    const auto fx = static_cast<float>(mouse_x);
+    const auto fy = static_cast<float>(mouse_y);
+    return (fx >= m_x && fx <= (m_x + m_width) &&
+            fy >= m_y && fy <= (m_y + m_width));
+}
+
+D_Pad::Direction D_Pad::GetDirectionFromTap(const float local_x, const float local_y) const
+{
+    const float segment = m_width / 3.0f;
+
+    int col = -1;
+    if (local_x < segment)
+        col = 0;
+    else if (local_x < 2 * segment)
+        col = 1;
+    else if (local_x <= m_width)
+        col = 2;
+    else
+        return Direction::NONE;
+
+    int row = -1;
+    if (local_y < segment)
+        row = 0;
+    else if (local_y < 2 * segment)
+        row = 1;
+    else if (local_y <= m_width)
+        row = 2;
+    else
+        return Direction::NONE;
+
+    if (col == 1 && row == 0)
+        return Direction::UP;
+    if (col == 1 && row == 2)
+        return Direction::DOWN;
+    if (col == 0 && row == 1)
+        return Direction::LEFT;
+    if (col == 2 && row == 1)
+        return Direction::RIGHT;
+
+    return Direction::NONE;
+}
+
+void D_Pad::OnTap(const int mouse_x, const int mouse_y)
+{
+    if (m_callback)
+    {
+        const auto local_x = static_cast<float>(mouse_x) - m_x;
+        const auto local_y = static_cast<float>(mouse_y) - m_y;
+
+        if (local_x >= 0 && local_x <= m_width && local_y >= 0 && local_y <= m_width)
+        {
+            const auto dir = GetDirectionFromTap(local_x, local_y);
+            m_callback(dir);
+        }
+    }
+}
+
+void D_Pad::ReleaseTap(const int mouse_x, const int mouse_y)
+{
+    ///
+}