If you want to play around a little bit more, go for it. I will not code
anymore tonight, so I will only clean this up tomorrow anyways. There are the
parameters you can play with
- In the last commit I removed the code that draws the circles to connect to
lines, so lines are not connected anymore. You might bring that back.
- the fuzzyness of the lines is defined through this line:
float alpha = pow(cos(var_color.a * PI / 2), 1.5);
the corners of each line quad are alpha = 1, opposite are -1, so the shader
gets a linear interpolated value between -1 and 1 across the line. This
function turns that into a non linear function that defines the falloff. You
can replace that or tweak the 1.5 to different values you like.
- glDepthFunction(GL_LEQUAL) vs glDepthFunction(GL_LESS) defines overdraw
behavior for overlapping lines. If two lines overlap, it defines if the second
lines pixel are drawn over the first line pixels or not - that obviously only
makes a difference if the pixel is partially transparent.
- The thickness of the lines in the plot area.
It might help to bring back this line in graphic:
screen_->draw_line_strip(
{FloatPoint(20, 300), FloatPoint(700, 500), FloatPoint(250,
50)}, RGBColor(255, 0, 0), 30, LineDrawMode::kAntialiased);
directly before:
RenderQueue::instance().draw(screen_->width(), screen_->height());
It draws a big fat line across your screen that is much bigger than any we use
in Widelands, but it gives you a feeling for your parameters.
It is fun to play around with that, but I did it too much now. Maybe you find
better parameters.
--
https://code.launchpad.net/~widelands-dev/widelands/beautiful_correct_lines/+merge/284517
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