#include <graphics.h>
struct Point
{
	int x;
	int y;
};
struct LineTool
{
	int size;						//大小
	COLORREF color;					//颜色
	struct Point beginPos;			//线的起点
	bool isDown;					//两个鼠标操作判断开发
};
struct LineTool* createLineTool(int size, COLORREF color)
{
	struct LineTool* pLine = (struct LineTool*)malloc(sizeof(struct LineTool));
	if (pLine == NULL)
		return NULL;
	pLine->color = color;
	pLine->size = size;
	pLine->isDown = false;
	return pLine;
}
void  drawLine(struct LineTool* pTool, MOUSEMSG m)
{
	//鼠标左键按下
	if (m.uMsg == WM_LBUTTONDOWN)
	{
		pTool->beginPos.x = m.x;
		pTool->beginPos.y = m.y;
		pTool->isDown = true;
	}
	//鼠标左键弹起
	if (m.uMsg == WM_LBUTTONUP)
	{
		pTool->isDown = false;
	}
	//鼠标移动+左键按下
	if (m.uMsg == WM_MOUSEMOVE && pTool->isDown == true)
	{
		setlinestyle(PS_ENDCAP_ROUND, pTool->size);
		setlinecolor(pTool->color);
		line(pTool->beginPos.x, pTool->beginPos.y, m.x, m.y);
	}
	pTool->beginPos.x = m.x;
	pTool->beginPos.y = m.y;
}
//颜色版
struct ColorTool
{
	int x;
	int y;
	int r;
	COLORREF color;
};

struct ColorTool* createColorTool(int x, int y, int r, COLORREF color)
{
	struct ColorTool* pColor = (struct ColorTool*)malloc(sizeof(struct ColorTool));
	if (pColor == NULL)
		return NULL;
	pColor->x = x;
	pColor->y = y;
	pColor->r = r;
	pColor->color = color;
	return pColor;
}
void drawColorTool(struct ColorTool* pColor)
{
	setfillcolor(pColor->color);
	solidcircle(pColor->x, pColor->y, pColor->r);
}

void drawRectangle()
{
	//set:设置  fill:填充  color:颜色
	setfillcolor(RGB(239, 239, 239));
	solidrectangle(1000 - 100, 0, 1000, 800);
}
int main()
{
	//逻辑
	initgraph(1000, 800);
	setbkcolor(WHITE);
	cleardevice();
	struct LineTool* pLine = createLineTool(5, BLACK);
	while (1)
	{
		drawRectangle();
		while (MouseHit())
		{
			MOUSEMSG m = GetMouseMsg();		//获取鼠标消息
			drawLine(pLine, m);
		}
	}
	closegraph();
	return 0;
}