Question

please help me with this computer graphics question

Tasks:Graphics program with GDI should be implemented with VC++2010. The graphics shoul have lines, filled polygons, text.(3+3+4marks)

Answer 1

Steps to create a Graphics project

1.Create a new Win32 project by following the below steps in VS2013

New->Project->Visual C++ -> Win32 Project-> Name the Project ->Finish

2.include following headers in .cpp file

#include <windows.h>
#include <gdiplus.h>
using namespace Gdiplus; 

3.Write the required code in OnPaint function of . cpp file

Code :

#include <stdafx.h>
#include <windows.h>
#include <objidl.h>
#include <gdiplus.h>
using namespace Gdiplus;
#pragma comment (lib,"Gdiplus.lib")

VOID OnPaint(HDC hdc)
{
   Graphics graphics(hdc);
   //Graphics draw Text
   SolidBrush brushText(Color(255, 0, 0));
   FontFamily fontFamily(L"Arial");
   Font font(&fontFamily, 24, FontStyleRegular, UnitPixel);
   PointF pointF(100.0f, 0.0f);
   graphics.DrawString(L"Welcome to Graphics World!", -1, &font, pointF, &brushText);

   //to draw lines
   Pen linePen(Color(34, 139, 34));
   // Create an array of Point objects that define the lines to draw.
   Point point1(200, 300);
   Point point2(400, 200);
   Point point3(500, 50);
   Point point4(200, 300);
   Point points[4] = { point1, point2, point3, point4 };
   Point* linePoints = points;
   graphics.DrawLines(&linePen, linePoints, 4);

   //Draw Filled Polygon
   SolidBrush blackBrush(Color(128, 0, 128));
   // Create an array of PointF objects that define the polygon.
   PointF pointPolygon1(100.0f, 100.0f);
   PointF pointPolygon2(200.0f, 130.0f);
   PointF pointPolygon3(150.0f, 200.0f);
   PointF pointPolygon4(50.0f, 200.0f);
   PointF pointPolygon5(0.0f, 130.0f);
   PointF pointsPolygon[5] = { pointPolygon1, pointPolygon2, pointPolygon3, pointPolygon4, pointPolygon5 };

   // Fill the polygon.
   graphics.FillPolygon(&blackBrush, pointsPolygon, 5);

  
}

LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);

INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE, PSTR, INT iCmdShow)
{
   HWND hWnd;
   MSG msg;
   WNDCLASS wndClass;
   GdiplusStartupInput gdiplusStartupInput;
   ULONG_PTR gdiplusToken;

   // Initialize GDI+.
   GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);

   wndClass.style = CS_HREDRAW | CS_VREDRAW;
   wndClass.lpfnWndProc = WndProc;
   wndClass.cbClsExtra = 0;
   wndClass.cbWndExtra = 0;
   wndClass.hInstance = hInstance;
   wndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
   wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
   wndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
   wndClass.lpszMenuName = NULL;
   wndClass.lpszClassName = TEXT("GraphicsExample");

   RegisterClass(&wndClass);

   hWnd = CreateWindow(
       TEXT("GraphicsExample"), // window class name
       TEXT("GraphicsExample"), // window caption
       WS_OVERLAPPEDWINDOW, // window style
       CW_USEDEFAULT, // initial x position
       CW_USEDEFAULT, // initial y position
       CW_USEDEFAULT, // initial x size
       CW_USEDEFAULT, // initial y size
       NULL, // parent window handle
       NULL, // window menu handle
       hInstance, // program instance handle
       NULL); // creation parameters

   ShowWindow(hWnd, iCmdShow);
   UpdateWindow(hWnd);

   while (GetMessage(&msg, NULL, 0, 0))
   {
       TranslateMessage(&msg);
       DispatchMessage(&msg);
   }

   GdiplusShutdown(gdiplusToken);
   return msg.wParam;
} // WinMain

LRESULT CALLBACK WndProc(HWND hWnd, UINT message,
   WPARAM wParam, LPARAM lParam)
{
   HDC hdc;
   PAINTSTRUCT ps;

   switch (message)
   {
   case WM_PAINT:
       hdc = BeginPaint(hWnd, &ps);
       OnPaint(hdc);
       EndPaint(hWnd, &ps);
       return 0;
   case WM_DESTROY:
       PostQuitMessage(0);
       return 0;
   default:
       return DefWindowProc(hWnd, message, wParam, lParam);
   }
} // WndProc

Output:

GraphicsExample Welcome to Graphics World!