GDI polygon problom(i think im gonna kill my compiler iif i dont work this out)

**PanzTec** · 02-09-2005

ok i have a problom... can some one please help me and tell me whats wrong be for i kill the thing.... and could you also tell me how to stop this happning again... thanks ppl

Code:

#include "Game.h"
#include <stdlib.h>
#include <time.h>
#include <stdio.h>
#include <math.h>
#include <string.h>

#define WINDOW_WIDTH    640
#define WINDOW_HEIGHT   480

struct Points
{
	long y;
	long x;
};

Points points[7];

void engine::Game_Main(HWND hwnd)
{
	
	HDC         hdc;

	hdc = GetDC(hwnd);
	///backround
	HBRUSH black = CreateSolidBrush(RGB(0,0,0));
	SelectObject(hdc,black);
	RECT rect;
	// create a rectangle
    rect.left   = 0;
    rect.top    = 0;
    rect.right  = 1000;
    rect.bottom = 1000;
	FillRect(hdc,&rect,black);
	DeleteObject(black);



	//end of backround
	 SetTextColor(hdc, RGB(100,0,255));
	TextOut(hdc,250,0, "Movment Test", strlen("Movment Test"));

	TextOut(hdc,0,435,"PanzTec Games.co   -   http://www.panrix.org", strlen("PanzTec Games.co   -   http://www.panrix.org"));
	
	
	ReleaseDC(hwnd, hdc);


}



void engine::ball_prog(HWND hwnd)
{
	HDC hdc;
	hdc = GetDC(hwnd);
	HBRUSH black = CreateSolidBrush(RGB(0,100,150));
	SelectObject(hdc,black);
	HPEN green_pen = CreatePen(PS_SOLID, 3,RGB(50,0,200));	
	HPEN old_pen = (HPEN)SelectObject(hdc, green_pen);
	balltx += aclx;
	ballbx += aclx;
	ballty += acly;
	ballby += acly;
	if(ballbx > 639)
	{
		aclx = -2;
	}
	if(ballby > 450)
	{
		acly = -2;
	}
	if(ballty < 1)
	{
		acly = 2;
	}
	if(balltx < 1)
	{
		aclx = 2;
	}
	Ellipse(hdc,balltx,ballty,ballbx,ballby);
	//Polygon(hdc, poly[], pointp);

	int points_count = 7;
	Polygon(hdc , points , points_count);

	SelectObject(hdc, old_pen);
	DeleteObject(green_pen);
	DeleteObject(old_pen);
	ReleaseDC(hwnd, hdc);


}

 engine::engine()
{


}
engine::~engine()
{

}


void engine::start()
{
	int i = 6;
	while( --i <= 0)
	{
		points.y[i] = rand()%500;
		points.x[i] = rand()%300;
	}

	acly = 2;
	aclx = 2;
	balltx = 300;
	ballbx = 350;
	ballty = 300;
	ballby = 350;
}

this is my error

Code:

--------------------Configuration: new windows - Win32 Debug--------------------
Compiling...
Game.cpp
d:\ufs\coding\main game\new windows\game.cpp(85) : error C2664: 'Polygon' : cannot convert parameter 2 from 'struct Points [7]' to 'const struct tagPOINT *'
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast
d:\ufs\coding\main game\new windows\game.cpp(111) : error C2228: left of '.y' must have class/struct/union type
d:\ufs\coding\main game\new windows\game.cpp(112) : error C2228: left of '.x' must have class/struct/union type
Error executing cl.exe.

new windows.exe - 3 error(s), 0 warning(s)

**skorman00** · 02-09-2005

I can't give you a solid answer without seeing the function prototype for Polygon(), however, I can confidently say that the second parameter is not be set up correctly to do what you want.

**anonytmouse** · 02-09-2005

The polygon function does not take an array of struct Points, it takes an array of POINT structures. This structure is defined by including <windows.h>.

So change this:

Code:

Points points[7];

to this:

Code:

POINT points[7];

Also, this:

Code:

    int i = 6;
    while( --i <= 0)
    {
        points.y[i] = rand()%500;
        points.x[i] = rand()%300;
    }

should be:

Code:

    for (int i = 0; i < 7; i++)
    {
        points[i].y = rand()%500;
        points[i].x = rand()%300;
    }

**PanzTec** · 02-11-2005

Thank you so very much. I thought I was gonna go nuts...

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