Open source Star Ruler 2 source code!

data/shaders/source/trade_line_ps.txt

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+#version 120
+varying vec2 uv;
+uniform float time;
+
+const float separation = 1500.0, speed = 5.0, size = 150.0;
+
+void main() {
+	float dToEdge = abs(uv.y - 0.5) * 2.0;
+
+	vec4 color = gl_Color;
+	color.a = 1.0;
+	
+	color.a *= dToEdge * dToEdge;
+	if(dToEdge > 0.85)
+		color.a += 0.3 * (dToEdge - 0.8)/0.2;
+		
+	if(dToEdge > 0.9)
+		color.a *= 1.0 - ((dToEdge - 0.9) / 0.1);
+	
+	if(mod(uv.x + ((1.0 - time) * separation * speed), separation) < size) {
+		color.a += max((0.8 - dToEdge) / 0.8, 0.0);
+		color.b = 1.0;
+	}
+
+	color.a *= gl_Color.a;
+	gl_FragColor = color;
+}