Re: trying to do a blinking text cursor

If all you want is a blinking cursor you can do it like this:


Code:

float g_Timer = 1.0f;

// How fast the cursor blinks
float g_BlinkSpeed	= 2.0f;

// The blinking cursor
SDL_Rect CursorQuad = {200, 200, 10, 20};

int main(int argc, char* argv[])
{
	while(g_Running)
	{
		g_Timer -= g_BlinkSpeed * (float)g_DeltaTime;

		if(g_Timer <= 0.0f)
			g_Timer = 2.0f;

		//////////////////////////////////////////////////////////////////////////

		// The cursor quad will be black
		SDL_SetRenderDrawColor(g_pRenderer, 0, 0, 0, SDL_ALPHA_OPAQUE);

		// Whenever the g_Timer value is even (even/odd), render the cursor
		if(((int)g_Timer & 1) == 0)
		{
			// Render the cursor quad
			SDL_RenderFillRect(g_pRenderer, &CursorQuad);

			/*
			If you want to use a font for rendering instead,
			remove 'SDL_RenderFillRect' above and use the code below
			For simplicity I've not done any error checking,
			i.e, checking that the surface and texture was successfully created and such
			*/

			SDL_Surface*	pSurface	= TTF_RenderText_Blended(Myfont, "|", CursorColor);
			SDL_Texture*	pTexture	= SDL_CreateTextureFromSurface(MyRenderer, pSurface);
			int				TexWidth	= 0;
			int				TexHeight	= 0;

			SDL_QueryTexture(pTexture, NULL, NULL, &TexWidth, &TexHeight);

			SDL_Rect PositionQuad = {200, 200, TexWidth, TexHeight};

			SDL_RenderCopy(MyRenderer, pTexture, NULL, &PositionQuad);

			SDL_DestroyTexture(pTexture);
			SDL_FreeSurface(pSurface);
		}
	}

	return 0;
}





Hope it helps.

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