code_twain/sane/DlgGamma.h

#pragma once

#include <Windows.h>
#include <string>

#include "DlgPage.h"

// CDlgIndicator 对话框

class dlg_gamma: public dlg_base
{
	int		exit_code_;
	bool	is_color_;
	bool	show_all_;
	RECT	paint_area_;
	HBITMAP	bkgnd_;

	typedef struct _gamma_curve
	{
		std::vector<POINT>	points;
		std::vector<double>	coefs;
		int					drag;
		int					left;
		int					right;
		COLORREF			clr;
	}GAMMACURVE;
	GAMMACURVE	rgb_gray_;
	GAMMACURVE	red_;
	GAMMACURVE	green_;
	GAMMACURVE	blue_;
	GAMMACURVE* cur_;

	BOOL handle_message(UINT msg, WPARAM wp, LPARAM lp) override;
	void handle_command(WORD code, WORD id, HANDLE ctrl);
	void layout(void);
	void create_background(void);
	void init_curve(GAMMACURVE* curv, COLORREF clr = RGB(255, 255, 255));
	int add_drag_point(int x, int y);
	BYTE calc_value(BYTE x);
	bool is_adjacent(POINT p1, POINT p2);
	bool hit_test(int* x, int* y);
	void draw_ellipse(HDC hdc, POINT center, int xl, int yl);
	void draw_current_curve(HDC hdc);

	void on_init_dlg(void);
	void on_paint(HDC hdc);
	void on_mouse_move(DWORD key, int x, int y);
	void on_lbutton_down(int x, int y);
	void on_lbutton_up(int x, int y);
	void on_combo_sel_changed(int id, int sel);

public:
	dlg_gamma(HWND parent, bool color);
	~dlg_gamma();

public:
	int do_modal(HWND parent);
	void get_gamma(SANE_Gamma* gamma);
	void set_gamma(const SANE_Gamma* gamma, bool gray);
};