HSFigure.cpp

#include "HSFigure.h"

HSBoldLinePoints HSCalcLinePointForConnectTwoCircle(HSCircle c1, HSCircle c2, double LineThickPercent) {
	//戻り値を収納する共用体
	HSBoldLinePoints hsbp;

	//上側の円と下側の円のポインタ
	HSCircle *pUpper, *pBelow;

	//左側の円と右側の円のポインタ
	HSCircle *pLeft, *pRight;

	/*
	初期設定
	*/
	//戻り値用の共用体初期化
	for (int i = 0; i < (sizeof(hsbp.Point) / sizeof(HSPosition)); i++) {
		hsbp.Point[i].x = 0;
		hsbp.Point[i].y = 0;
	}

	//パラメータの２つの円を上下に識別する
	if (c1.CorePos.y >= c2.CorePos.y) {
		pUpper = &c1;
		pBelow = &c2;
	} else {
		pUpper = &c2;
		pBelow = &c1;
	}

	//パラメータの２つの円を左右に識別する
	if (c1.CorePos.x >= c2.CorePos.x) {
		pRight = &c1;
		pLeft = &c2;
	} else {
		pRight = &c2;
		pLeft = &c1;
	}

	/*
	共通準備・計算
	*/
	//2つの円の距離
	HSPosition Distance;

	//2つの円の中心を線で結んだ時の角度(θ)
	double Theta;

	//θを基準に反時計回りで直角に交わるときの角度(θ+90度)
	double LeftTheta;

	//θを基準に時計回りで直角に交わるときの角度(θ-90度)
	double RightTheta;

	//単位円上においての位置
	HSPosition OnUnitCircleByLeftTheta;
	HSPosition OnUnitCircleByRightTheta;

	//距離を計算
	Distance.x = pRight->CorePos.x - pLeft->CorePos.x;
	Distance.y = pUpper->CorePos.y - pBelow->CorePos.x;

	//角度を取得
	Theta = atan2(Distance.y, Distance.x);

	//θを基準に反時計回りで直角に交わるときの角度を計算
	LeftTheta = Theta + M_PI / 2.0;

	//θを基準に時計回りで直角に交わるときの角度を計算
	RightTheta = Theta - M_PI / 2.0;

	//単位円上においての位置を計算
	OnUnitCircleByLeftTheta.x = cos(LeftTheta);
	OnUnitCircleByLeftTheta.y = sin(LeftTheta);
	OnUnitCircleByRightTheta.x = cos(RightTheta);
	OnUnitCircleByRightTheta.y = sin(RightTheta);


	/*
	上側の円についての計算
	*/

	//上側の円の直径の LineThickPercent パーセントの長さ
	double LengthOfLineInUpperCircle = pUpper->Radius * LineThickPercent / 50.0;

	//上部・左側の位置の計算
	hsbp.Detail.TopLeft.x = LengthOfLineInUpperCircle / 2.0 * OnUnitCircleByLeftTheta.x + pUpper->CorePos.x;
	hsbp.Detail.TopLeft.y = LengthOfLineInUpperCircle / 2.0 * OnUnitCircleByLeftTheta.y + pUpper->CorePos.y;

	//上部・右側の位置の計算
	hsbp.Detail.TopRight.x = LengthOfLineInUpperCircle / 2.0 * OnUnitCircleByRightTheta.x + pUpper->CorePos.x;
	hsbp.Detail.TopRight.y = LengthOfLineInUpperCircle / 2.0 * OnUnitCircleByRightTheta.y + pUpper->CorePos.y;

	/*
	下側の円についての計算
	*/
	//下側の円の直径の LineThickPercent パーセントの長さ
	double LengthOfLineInBelowCircle = pBelow->Radius * LineThickPercent / 50.0;

	//下部・左側の位置の計算
	hsbp.Detail.BottomLeft.x = LengthOfLineInBelowCircle / 2.0 * OnUnitCircleByLeftTheta.x + pBelow->CorePos.x;
	hsbp.Detail.BottomLeft.y = LengthOfLineInBelowCircle / 2.0 * OnUnitCircleByLeftTheta.y + pBelow->CorePos.y;

	//下部・右側の位置の計算
	hsbp.Detail.BottomRight.x = LengthOfLineInBelowCircle / 2.0 * OnUnitCircleByRightTheta.x + pBelow->CorePos.x;
	hsbp.Detail.BottomRight.y = LengthOfLineInBelowCircle / 2.0 * OnUnitCircleByRightTheta.y + pBelow->CorePos.y;

	return hsbp;
}

HSFigure.h

#ifndef __HSFIGURE__
#define __HSFIGURE__

#define _USE_MATH_DEFINES
#include <stdio.h>
#include <math.h>

struct HSPosition {
	double x;									//X座標
	double y;									//Y座標
};

struct HSCircle {
	HSPosition CorePos;				//中心座標
	double Radius;							//半径
};

union HSBoldLinePoints {
	struct Named {
		HSPosition TopLeft;				//上部・左の座標
		HSPosition TopRight;			//上部・右の座標
		HSPosition BottomRight;		//下部・右の座標
		HSPosition BottomLeft;		//下部・左の座標
	}Detail;
	HSPosition Point[4];				//4点の座標
};

HSBoldLinePoints HSCalcLinePointForConnectTwoCircle(HSCircle c1, HSCircle c2, double LineThickPercent);

#endif