C語言控制臺應(yīng)用程序GDI繪制正弦曲線

#include <windows.h>//引入wingdi.h
#include <stdio.h>
#include <math.h>
#include <time.h>
#include <conio.h>
 
#define PI 3.1416
 
#define ORIGINX 0 //曲線起點X坐標(biāo)
#define ORIGINY 200 //曲線起點Y坐標(biāo)
#define LENGTHX 800 //X坐標(biāo)軸長度
#define LENGTHY 300 //Y坐標(biāo)軸長度
#define XDATALEN 300//X坐標(biāo)數(shù)據(jù)量
 
HDC hdc = 0;//控制臺繪圖設(shè)備描述句柄 HDC
HPEN hPen, hPen2;//畫筆變量
HPEN hPenOld;
TCHAR title[256];//控制臺程序標(biāo)題
int times = 0;//繪制次數(shù)變量
double datay[XDATALEN];//曲線縱坐標(biāo)數(shù)組
 
  //繪制清屏矩形
void ClearWind(HDC hdc)
{
 HPEN hPen;
 HBRUSH hBrush;
 hBrush = CreateSolidBrush(RGB(0, 0, 0));
 hPen = CreatePen(PS_SOLID, 0, RGB(0, 0, 0));
 SelectObject(hdc, hBrush);
 SelectObject(hdc, hPen);
 //繪制黑色矩形，范圍可根據(jù)需要自行更改
 Rectangle(hdc, ORIGINX, 0, ORIGINX + LENGTHX + 1, ORIGINY + LENGTHY + 1);
}
 
int main()
{
 //獲取控制臺標(biāo)題
 GetConsoleTitle(title, 256);
 //先通過FindWindow函數(shù)借助標(biāo)題獲取窗口句柄HWND，之后再利用GetDC函數(shù)借助HWND獲取HDC
 hdc = GetDC(FindWindow(0, title));
 hPen = CreatePen(PS_SOLID, 3, RGB(255, 0, 0));//設(shè)置曲線畫筆,紅色
 hPen2 = CreatePen(PS_SOLID, 3, RGB(0, 0, 255));//設(shè)置X軸畫筆,藍(lán)色
 hPenOld = (HPEN)SelectObject(hdc, hPen);
 
 while (1)
 {
 ClearWind(hdc);//清屏
 hPenOld = (HPEN)SelectObject(hdc, hPen);//選擇畫筆
 MoveToEx(hdc, ORIGINX, ORIGINY, NULL);//移動到起點
 
 for (int i = 0; i < XDATALEN; i++)
 {
 datay[i] = sin(0.1*i + times);//生成曲線縱坐標(biāo)數(shù)組
 }
 
 for (int i = 0; i < XDATALEN; i++)
 {
 //繪制線段,連接前一個點與下一個點，第二個參數(shù)為目標(biāo)點x坐標(biāo)，第三個參數(shù)為y坐標(biāo)
 LineTo(hdc, LENGTHX * i / XDATALEN + ORIGINX, 0.5 * LENGTHY * datay[i] + ORIGINY);
 }
 //創(chuàng)建繪制x軸的pen并將其選入設(shè)備上下文
 hPenOld = (HPEN)SelectObject(hdc, hPen2);//選擇畫筆
 MoveToEx(hdc, ORIGINX, ORIGINY, NULL);//移動到起點
 LineTo(hdc, ORIGINX + LENGTHX, ORIGINY);//繪制X軸直線
 times++;
 Sleep(100);//延時100ms
 
 if (kbhit())//檢查是否有按鍵按下
 {
 if (_getch() == 0x1b)//若按下ESC鍵跳出循環(huán)
 {
 break;
 }
 }
 }
 
 DeleteObject(hPen);//刪除畫筆
 DeleteObject(hPen2);//刪除畫筆
 return 0;
}