Unexpected result while drawing pixels

[motherbrain]

Hi,

I'm new to SFML and I got some unexpected results running my first test code:

Code: [Select]

#include <SFML/Graphics.hpp>

using namespace sf;

int main()
{
const unsigned int width = 200;
const unsigned int height = width;

RenderWindow app(VideoMode(width, height, 32), "");

Image image(width, height);
Sprite sprite(image);

const unsigned int step = 2;
for (unsigned int y = 0; y <= height - step; y += step)
{
for (unsigned int x = 0; x <= width - step; x += step)
{
image.SetPixel(x, y, Color::White);
}
}

app.Draw(sprite);
app.Display();

while (app.IsOpened())
{
Event event;
while (app.GetEvent(event))
{
if (event.Type == Event::Closed)
{
app.Close();
}
}
}

return EXIT_SUCCESS;
}


The resulting image is not what I would expect: the pixels become gray and blurry towards the edges of the image. What is causing this and how can I prevent it? I'm using SFML version 1.5 under Windows 7 64 bit with an ATI Radeon 5770 graphics card with the latest display drivers.

I would like to mix drawing shapes (using sf::Shape::Line, sf::Shape::Circle and sf::Shape::Rectangle) and pixels: draw some shapes, then draw some pixels, draw some more shapes, etc, and then display the results. What is a good approach to draw the pixels in this case?

[motherbrain]

I have uploaded a screenshot that shows the problem: click

[Nexus]

With the following code, you can deactivate the smooth filter (which is enabled by default):

Code: [Select]

image.SetSmooth(false);

[motherbrain]

Thanks! This solved my first problem. But why is the image in the center different from the edges when the smooth filter is active?

[Laurent]

This is a pattern which is produced by the filtering method.