color wheel and picker

engine/node_colorwheel.h

@@ -3,21 +3,33 @@
 #include "node.h"
 #include "shape.h"
 #include "node_slider.h"
+#include "node_border.h"
 
 class NodeColorWheel : public Node
 {
 public:
     ui::Circle m_circle;
-    ui::Circle m_cur_hue;
+    ui::Plane m_cur_hue;
+    ui::Circle m_cur_quad;
+    ui::Plane m_quad;
+    NodeBorder* m_color_cur;
     glm::vec3 m_hsv;
     GLuint m_tri_vbo;
     GLuint m_tri_vao;
     GLuint buffers;
     GLuint arrays;
+    std::function<void(Node* target, glm::vec3 hsv)> on_value_changed;
+    int mode; // 1:hue 2:quad
+    bool dragging = false;
+    glm::vec3 m_old_value{0.f};
     virtual Node* clone_instantiate() const override;
-    virtual void clone_finalize(Node* dest) const;
+    virtual void clone_finalize(Node* dest) const override;
     virtual void init() override;
     virtual void loaded() override;
     virtual void draw() override;
+    virtual kEventResult handle_event(Event* e) override;
     void init_controls();
+    glm::vec4 get_quad_rect() const;
+    bool inside_quad(glm::vec2 pos, glm::vec2& out_coord) const;
+    void handle_color_change();
 };