// テストスクリプト

// グローバル変数
int xpos[1000], ypos[1000];
int xlast, ylast;
int start, count;
int drag;

// 直線の追加
void AddLine(int x, int y)
{
	xpos[start] = x;
	ypos[start] = y;
	start += 1;
	if (start >= 1000)
		start = 0;
	if (count < 1000)
		count += 1;
	xlast = x;
	ylast = y;
}

// WM_PAINTの処理
int OnPaint(int dc)
{
	int i;
	int pos;

	if (count > 0) {
		pos = start - count;
		if (pos < 0)
			pos += 1000;

		SetColor(dc, 0, 0, 0);
		MoveTo(dc, xpos[pos], ypos[pos]);

		for (i=1; i<count; i+=1) {
			pos += 1;
			if (pos >= 1000)
				pos -= 1000;
			LineTo(dc, xpos[pos], ypos[pos]);
		}
	}
	return 0;
}

// WM_LBUTTONDOWNの処理
int OnLButtonDown(int x, int y)
{
	count = 0;
	start = 0;
	drag = 1;
	AddLine(x, y);
	return 0;
}

// WM_MOUSEMOVEの処理
int OnMouseMove(int x, int y)
{
	if (drag) {
		int dc;
		dc = GetDC();
		SetColor(dc, 0, 0, 0);
		MoveTo(dc, xlast, ylast);
		LineTo(dc, x, y);
		ReleaseDC(dc);

		AddLine(x, y);
	}
	return 0;
}

// WM_LBUTTONDOWNの処理
int OnLButtonUp(int x, int y)
{
	OnMouseMove(x, y);
	drag = 0;

	return 0;
}