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@ohisama@github

vs2010でmfcやってみた。
コッホ曲線やってみた。

手順

• mfcアプリケーション、ダイアログベースでプロジェクト名は、mfc0で作る。
• IDD_MFC0_DIALOGを開く
• OKボタンをクリック。
• コードを書く。
• 実行。

サンプルコード

``````

typedef struct tagFPOINT {
double x;
double y;
} FPOINT;
void DrawLine(FPOINT p1, FPOINT p2, CDC * pDC)
{
pDC->MoveTo((int)(p1.x + 0.5), (int)(p1.y + 0.5));
pDC->LineTo((int)(p2.x + 0.5), (int)(p2.y + 0.5));
}
FPOINT RotateLine(FPOINT p1, FPOINT p2, double alpha)
{
double x0 = p1.x;
double y0 = p1.y;
double x1 = p2.x - x0;
double y1 = p2.y - y0;
FPOINT pntRet;
pntRet.x = x1 * cos(alpha) - y1 * sin(alpha) + x0;
pntRet.y = x1 * sin(alpha) + y1 * cos(alpha) + y0;
return pntRet;
}
FPOINT ShortenLine(FPOINT p1, FPOINT p2, double Ratio)
{
FPOINT pntRet;
if (p1.x == p2.x && p1.y == p2.y)
{
pntRet = p1;
}
if (p1.x == p2.x)
{
pntRet.x = p1.x;
pntRet.y = p1.y + (p2.y - p1.y) * Ratio;
}
else if (p1.y == p2.y)
{
pntRet.y = p1.y;
pntRet.x = p1.x + (p2.x - p1.x) * Ratio;
}
else
{
pntRet.x = p1.x + (p2.x - p1.x) * Ratio;
pntRet.y = p1.y + (p2.y - p1.y) * Ratio;
}
return pntRet;
}
void KochCurve(int n, FPOINT p1, FPOINT p2, CDC * pDC)
{
if (n == 1)
{
DrawLine(p1, p2, pDC);
}
else
{
FPOINT pc1 = ShortenLine(p1, p2, 1.0 / 3.0);
FPOINT pc2 = ShortenLine(p1, p2, 2.0 / 3.0);
FPOINT pc = RotateLine(pc1, pc2, -acos(1.0 / 2.0));
KochCurve(n - 1, p1, pc1, pDC);
KochCurve(n - 1, pc1, pc, pDC);
KochCurve(n - 1, pc, pc2, pDC);
KochCurve(n - 1, pc2, p2, pDC);
}
}
void Cmfc0Dlg::OnBnClickedOk()
{
CClientDC dc(this);
FPOINT p1 = {
200,
300
};
FPOINT p2 = {
800,
300
};
KochCurve(6, p1, p2, &dc);
}

``````

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