7Windows_paint GDI绘图

// 7Windows_paint.cpp : 定义应用程序的入口点。
//
#include "stdafx.h"
#include "7Windows_paint.h"
#include "resource.h"
#include <iostream>
HINSTANCE g_hInst = NULL;
HANDLE g_hStdout = NULL; //控制台
int g_DrawType = 0;
COLORREF g_nPenColor = RGB(0,0,0); //画笔颜色
int g_nPenStyle = PS_SOLID; //画笔样式
int g_nPenWdith = 1; //画笔宽度
COLORREF g_nBrushColor = RGB(0, 0, 0); //画刷
int g_nBrushStyle = 0xFFFFFFFF; //画刷样式
CHAR szText[256] = { 0 }; //备用字符串
#define PrintLog(x) WriteConsole(g_hStdout, x, strlen(x), NULL, NULL)
void DrawPixel(HDC hDC)
{
	COLORREF nColor = RGB(255,0,0);
	SetPixel(hDC, 100, 100, nColor);
}
void GetPixelColor(HDC hDC)
{
	COLORREF nColor = GetPixel(hDC, 100, 100);
	int nRed = GetRValue(nColor);
	int nGreen = GetGValue(nColor);
	int nBlue = GetBValue(nColor);
	sprintf_s(szText, 256, "nRed=%d,nGreen=%d,nBlue=%d", nRed, nGreen, nBlue);
	//PrintLog(szText);
	MessageBox(NULL, szText, "color", MB_OK);
	
}
//DrawLine
void DrawLine(HDC hDC)
{
	MoveToEx(hDC, 0, 0, NULL); //当前点
	LineTo(hDC, 500, 500);
	MoveToEx(hDC, 500, 0, NULL);
	LineTo(hDC, 0, 500);
}
//DrawArc弧
void DrawArc(HDC hDC)
{
	SetArcDirection(hDC, AD_CLOCKWISE);//AD_COUNTERCLOCKWISE //顺时针
	Arc(hDC, 400, 200, 500, 300, 500, 200, 400, 200); //顺时针和逆时针画出来的东西不同
	SetArcDirection(hDC, AD_COUNTERCLOCKWISE);//AD_CLOCKWISE //逆时针
	Arc(hDC, 500, 200, 600, 300, 600, 200, 500, 400); //顺时针和逆时针画出来的东西不同
	MoveToEx(hDC, 200, 200, NULL);
	AngleArc(hDC, 200, 200, 100, 90, 270);
	LineTo(hDC, 200, 200);
}
//DrawPolyLine
//折线
void DrawPolyLine(HDC hDC)
{
	POINT ptPolyLine[7] = { 0 }; //三角形需要4个点
	ptPolyLine[0].x = 100;
	ptPolyLine[0].y = 100;
	ptPolyLine[1].x = 200;
	ptPolyLine[1].y = 100;
	ptPolyLine[2].x = 200;
	ptPolyLine[2].y = 200;
	ptPolyLine[3].x = 300;
	ptPolyLine[3].y = 200;
	ptPolyLine[4].x = 300;
	ptPolyLine[4].y = 300;
	ptPolyLine[5].x = 400;
	ptPolyLine[5].y = 300;
	ptPolyLine[6].x = 400;
	ptPolyLine[6].y = 400;
	//两点绘制一直线
	Polyline(hDC, ptPolyLine, 7); //绘制折线
	//PolylineTo(hDC, ptPolyLine, 4);
	/*
		分成两组，这两组之间没有任何关联
	*/
	DWORD nGroup[2] = { 3, 4 };
	//PolyPolyline(hDC, ptPolyLine, nGroup, 2);
}
//DrawBizer曲线
void DrawBizer(HDC hDC)
{
	POINT ptBizer[7] = { 0 };
	ptBizer[0].x = 100; //端点
	ptBizer[0].y = 100;
	ptBizer[1].x = 150; //控制点
	ptBizer[1].y = 50;
	ptBizer[2].x = 300; //控制点
	ptBizer[2].y = 150;
	ptBizer[3].x = 300; //端点
	ptBizer[3].y = 100;
	ptBizer[4].x = 300; //控制点
	ptBizer[4].y = 400;
	ptBizer[5].x = 400; //控制点
	ptBizer[5].y = 200;
	ptBizer[6].x = 500; //端点
	ptBizer[6].y = 300;
	PolyBezier(hDC, ptBizer, 7);
	//为了看的更清楚，把切线也给划出来
	MoveToEx(hDC, ptBizer[0].x, ptBizer[0].y,NULL);
	LineTo(hDC, ptBizer[1].x, ptBizer[1].y);
	MoveToEx(hDC, ptBizer[2].x, ptBizer[2].y, NULL);
	LineTo(hDC, ptBizer[3].x, ptBizer[3].y);
}
//DrawPolyDraw多样式线
void DrawPolyDraw(HDC hDC)
{
	POINT ptDraw[4] = { 0 };
	ptDraw[0].x = 100;
	ptDraw[0].y = 100;
	ptDraw[1].x = 200;
	ptDraw[1].y = 100;
	ptDraw[2].x = 200;
	ptDraw[2].y = 200;
	ptDraw[3].x = 300;
	ptDraw[3].y = 200;
	BYTE ptType[4] = { 0 }; //PolyDraw第三个参数
	ptType[0] = PT_MOVETO;
	ptType[1] = PT_LINETO;
	ptType[2] = PT_MOVETO;
	ptType[3] = PT_LINETO;
	PolyDraw(hDC, ptDraw, ptType, 4);
}
//Rect 矩形
void DrawRect(HDC hDC)
{
	//矩形
	Rectangle(hDC, 100, 100, 200, 200);
	//带圆角矩形
	RoundRect(hDC, 300, 100, 400, 200, 10, 10);
}
//DrawEllipse圆和椭圆
void DrawEllipse(HDC hDC)
{
	//圆
	Ellipse(hDC, 100, 100, 200, 200);
	//椭圆
	Ellipse(hDC, 300, 100, 500, 200);
}
//DrawPie饼图
void DrawPie(HDC hDC)
{
	Pie(hDC, 100, 100, 500, 400, 500, 100, 100, 100);
}


//Chord弦
void DrawChord(HDC hDC)
{
	Chord(hDC, 100, 100, 500, 400, 500, 100, 100, 100);
}
//DrawPolygon多边形
void DrawPolygon(HDC hDC)
{
	POINT ptPolygon[7] = { 0 };
	ptPolygon[0].x = 100;
	ptPolygon[0].y = 100;
	ptPolygon[1].x = 200;
	ptPolygon[1].y = 100;
	ptPolygon[2].x = 200;
	ptPolygon[2].y = 200;
	ptPolygon[3].x = 300;
	ptPolygon[3].y = 200;
	ptPolygon[4].x = 300;
	ptPolygon[4].y = 300;
	ptPolygon[5].x = 400;
	ptPolygon[5].y = 300;
	ptPolygon[6].x = 400;
	ptPolygon[6].y = 400;
	Polygon(hDC, ptPolygon, 7);
}
void OnPaint(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam)
{
	PAINTSTRUCT ps = { 0 };
	HDC hDC = BeginPaint(hWnd,&ps);
	//画笔使用
	//创建画笔
	HPEN hPen = CreatePen(g_nPenStyle, g_nPenWdith, g_nPenColor);
	//设置画笔到当前DC
	HPEN hOldPen = (HPEN)SelectObject(hDC, hPen);
	
	//画刷使用*/
	//创建画刷
	/*以下一句为默认画刷*/
	//HBRUSH hBrush = CreateSolidBrush(g_nBrushColor);
	//创建画刷样式时改写
	HBRUSH hBrush = NULL;
	if (g_nBrushStyle == 0xFFFFFFFF)
	{
		hBrush = CreateSolidBrush(g_nBrushColor);
	}
	else
	{
		hBrush = CreateHatchBrush(g_nBrushStyle, g_nBrushColor);
	}
	//设置画刷到当前DC
	HBRUSH hOldBrush = (HBRUSH)SelectObject(hDC, hBrush);
	//绘制图形
	//在绘制图形里面根据类型绘制图形
	switch (g_DrawType)
	{
	case ID_SETPIXEL:
		DrawPixel(hDC);
		break;
	case ID_GETPIXEL:
		GetPixelColor(hDC);
		break;
	case ID_LINE:
		DrawLine(hDC);
		break;
	case ID_ARC:
		DrawArc(hDC);
		break;
	case ID_POLYLINE:
		DrawPolyLine(hDC);
		break;
	case ID_DRAWBIZER:
		DrawBizer(hDC);
		break;
	case ID_POLYDRAW:
		DrawPolyDraw(hDC);
		break;
		//矩形
	case ID_RECT:
		DrawRect(hDC);
		break;
	case ID_ELLIPSE:
		DrawEllipse(hDC);
		break;
	case ID_PIE:
		DrawPie(hDC);
		break;
	case ID_CHORD:
		DrawChord(hDC);
		break;
	case ID_POLYGON:
		DrawPolygon(hDC);
		break;
	}
	//画笔使用2
	//取出画笔
	SelectObject(hDC, hOldPen);
	//销毁画笔
	DeleteObject(hPen);
	//画刷使用2
	//取出画刷
	SelectObject(hDC, hOldBrush);
	//销毁画刷
	DeleteObject(hBrush);
	EndPaint(hWnd,&ps);
}
//OnCommand
void OnCommand(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam)
{
	int nCmdID = LOWORD(wParam);
	switch (nCmdID)
	{
	case ID_SETPIXEL: //Get 和 Set都是同样的代码，所以这样简写
	case ID_GETPIXEL:
	case ID_LINE: //线
	case ID_ARC: //弧
	case ID_POLYLINE: //折线
	case ID_DRAWBIZER: //BIZER曲线
	case ID_POLYDRAW: //多样式线
		//矩形
	case ID_RECT:
	case ID_ELLIPSE:
	case ID_PIE:
	case ID_CHORD:
	case ID_POLYGON:
		g_DrawType = nCmdID; //保存绘制图形类型
		//刷新窗口
		InvalidateRect(hWnd, NULL, TRUE);
		break;
	case ID_REDPEN: //红色画笔
		//把这个笔保存到全局变量中
		g_nPenColor = RGB(255, 0, 0); //画笔颜色
		//刷新窗口
		InvalidateRect(hWnd, NULL, TRUE);
		break;
	case PS_PSDASH: //画笔的样式为虚线
		g_nPenStyle = PS_DASH;
		InvalidateRect(hWnd, NULL, TRUE);
		break;
	case ID_PEN1: //画笔宽度为1
		g_nPenWdith = 1;
		InvalidateRect(hWnd, NULL, TRUE);
		break;
	case ID_PEN5: //画笔宽度为5
		g_nPenWdith = 5;
		InvalidateRect(hWnd, NULL, TRUE);
		break;
		//画刷颜色
	case ID_REDBRUSH:
		g_nBrushColor = RGB(255, 0, 0);
		InvalidateRect(hWnd, NULL, TRUE);
		break;
	case ID_GREENBRUSH:
		g_nBrushColor = RGB(0, 255, 0);
		InvalidateRect(hWnd, NULL, TRUE);
		break;
		//画刷样式
	case ID_SOLIDBRUSH:
		g_nBrushStyle = 0xFFFFFFFF;
		InvalidateRect(hWnd, NULL, TRUE);
		break;
	case ID_HSDIAGCROSS:
		g_nBrushStyle = HS_DIAGCROSS;
		InvalidateRect(hWnd, NULL, TRUE);
		break;
	case ID_EXIT:
		PostQuitMessage(0);
		break;
	}
}
LRESULT CALLBACK WndProc(HWND hWnd, UINT nMsg, WPARAM wParam, LPARAM lParam)
{
	switch (nMsg)
	{
	case WM_PAINT:
		OnPaint(hWnd, nMsg, wParam, lParam);
		break;
	case WM_COMMAND:
		OnCommand(hWnd, nMsg, wParam, lParam);
		break;
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	}
	return DefWindowProc(hWnd, nMsg, wParam, lParam);
}
BOOL RegisterWnd(LPSTR pszClassName)
{
	WNDCLASSEX wce = { 0 };
	wce.cbClsExtra = 0;
	wce.cbSize = sizeof(wce);
	wce.cbWndExtra = 0;
	wce.hbrBackground = HBRUSH(COLOR_BTNFACE + 1);
	wce.hCursor = NULL;
	wce.hIcon = NULL;
	wce.hIconSm = NULL;
	wce.hInstance = g_hInst;
	wce.lpfnWndProc = WndProc;
	wce.lpszClassName = pszClassName;
	wce.lpszMenuName = NULL;
	wce.style = CS_VREDRAW | CS_HREDRAW;
	ATOM aTom = RegisterClassEx(&wce);
	if (aTom)
	{
		return TRUE;
	}
	else
	{
		return FALSE;
	}
}
HWND CreateWnd(LPSTR pszClassName)
{
	CHAR szTextWindow[256] = { 0 };
	LoadString(g_hInst, IDS_WNDID, szTextWindow, 256);
	//添加菜单
	HMENU hMenu = LoadMenu(g_hInst, MAKEINTRESOURCE(IDR_MENU1));
	HWND hWnd = CreateWindowEx(0, pszClassName, szTextWindow, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,
		NULL, hMenu, g_hInst, NULL);
	return hWnd;
}
void ShowWnd(HWND hWnd)
{
	ShowWindow(hWnd, SW_SHOW);
	UpdateWindow(hWnd);
}
void Msg()
{
	MSG msg = { 0 };
	while (GetMessage(&msg, NULL, 0, 0))
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
}
void ConsoleWnd()
{
	AllocConsole();
	g_hStdout = GetStdHandle(STD_OUTPUT_HANDLE);
	CHAR szText[] = "Debug start:\n";
	WriteConsole(g_hStdout, szText, strlen(szText), NULL, NULL);
}
int WINAPI WinMain(_In_ HINSTANCE hInstance, _In_opt_ HINSTANCE hPrevInstance, _In_ LPSTR lpCmdLine, _In_ int nShowCmd)
{
	g_hInst = hInstance;
	//AllocConsole();
	RegisterWnd("9999");
	HWND hWnd = CreateWnd("9999");
	ShowWnd(hWnd);
	Msg();
	return 0;
}