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/*ＳＴＧの作り方　加速・摩擦などを利用したプログラム*/
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#include "DxLib.h"

void my_init_point(void);
void my_init_color(void);

void my_move_point(void);

void my_to_center(void);

void my_draw_back(void);
void my_draw_point(void);
void my_draw_score_board(void);

double x,y,draw_x,draw_y;

/*移動量*/
double m_x,m_y;
/*加速度*/
double a_x,a_y;
/*摩擦係数*/
double f_x,f_y;

int count;
int Color_White;
int Color_Gray;

int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int){
	ChangeWindowMode(TRUE);
	DxLib_Init();
	SetDrawScreen(DX_SCREEN_BACK);

	my_init_point();
	my_init_color();

	while (ScreenFlip() == 0 && ProcessMessage() == 0 &&
		 ClearDrawScreen() == 0){

		my_draw_back();

		my_move_point();
		my_to_center();
		my_draw_point();
		
		my_draw_score_board();

		count++;
	}
	DxLib_End();
	return 0;
}

void my_init_point(){
	x = -220;
	y = 0;
	draw_x = 0;
	draw_y = 0;

	/*移動量の初期化*/
	m_x = 1;
	m_y = 0;

	/*加速度の初期化*/
	a_x = 0;
	a_y = 0;
}

void my_init_color(){
	Color_White = GetColor(255, 255, 255);
	Color_Gray = GetColor(100, 100, 100);
}

void my_move_point(){
	/*座標に移動量を足し合わせる部分*/
	x = x + m_x;
	y = y + m_y;

	/*移動量に加速度を足し合わせる部分*/
	m_x = m_x + a_x;
	m_y = m_y + a_y;
}

void my_to_center(){
	draw_x = x + 220;
	draw_y = ((-1) * y) + 240;
}

void my_draw_back(){
	DrawLine(0, 240, 440, 240, Color_White);
	DrawLine(220, 0, 220, 480, Color_White);
	DrawFormatString(220, 240, Color_White, "(0,0)");
}

void my_draw_score_board(){
	DrawBox(440,0,640,480,Color_Gray,true);
	DrawFormatString(490, 20, Color_White, "Ｃ言語入門");
	DrawFormatString(475, 40, Color_White, "ＳＴＧの作り方");
	DrawFormatString(460, 60, Color_White, "関数表示プログラム");
	DrawFormatString(500, 280, Color_White, "count:%d",count);
	DrawFormatString(500, 300, Color_White, "x座標:%d",(int)x);
	DrawFormatString(500, 320, Color_White, "y座標:%d",(int)y);
	DrawFormatString(465, 340, Color_White, "移動量x:%f",m_x);
	DrawFormatString(465, 360, Color_White, "移動量y:%f",m_y);
	DrawFormatString(465, 380, Color_White, "加速度x:%f",a_x);
	DrawFormatString(465, 400, Color_White, "加速度y:%f",a_y);
	DrawFormatString(465, 420, Color_White, "摩擦係数x:%f",f_x);
	DrawFormatString(465, 440, Color_White, "摩擦係数y:%f",f_y);
}

void my_draw_point(){
	DrawCircle(draw_x,draw_y, 5, Color_White, 1);
}
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