Add example for cars alongside

conf/cars_alongside.lua

@@ -0,0 +1,60 @@
+-- configuration
+-- set these accordingly
+right_leds_start = 7
+right_num_leds = 42
+left_leds_start = 49
+left_num_leds = 42
+--
+
+max_radius = 10 -- radius is hardcoded in simapi
+proxcars = simdata.proxcars -- also hard coded in simapi
+
+rightsideset = false
+leftsideset = false
+
+-- right side
+litleds = 0
+i = 1
+while(i <= proxcars and rightsideset == false) do
+    if simdata.pd[i].theta > 40 and simdata.pd[i].theta < 130 then
+        dist = math.abs(90 - simdata.pd[i].theta)
+        perct = (90 - dist)/90
+        litleds = math.ceil(perct * right_num_leds)
+
+        color_perct = simdata.pd[i].radius/10
+        yellow = math.floor(color_perct * 255)
+        local rgb = (0 << 24) | (yellow << 16) | (255 << 8)
+        if simdata.pd[1].theta >= 90 then
+            -- car is behind
+            set_led_range_to_rgb_color(right_leds_start, right_leds_start + litleds, rgb)
+        else
+            set_led_range_to_rgb_color(right_leds_start + (right_num_leds - litleds), right_leds_start + right_num_leds, rgb)
+        end
+        rightsideset = true
+    end
+    i = i + 1
+end
+
+-- left side
+litleds = 0
+i = 1
+while(i <= proxcars and leftsideset == false) do
+    if simdata.pd[i].theta > 230 and simdata.pd[i].theta < 320 then
+        dist = math.abs(270 - simdata.pd[1].theta)
+        perct = (90 - dist)/90
+        litleds = math.ceil(perct * left_num_leds)
+
+        color_perct = simdata.pd[i].radius/10
+        yellow = math.floor(color_perct * 255)
+        local rgb = (0 << 24) | (yellow << 16) | (255 << 8)
+        if simdata.pd[1].theta <= 270 then
+            -- car is behind
+            set_led_range_to_rgb_color(left_leds_start, left_leds_start + litleds, rgb)
+        else
+            set_led_range_to_rgb_color(left_leds_start + (left_num_leds - litleds), left_leds_start + left_num_leds, rgb)
+        end
+        leftsideset = true
+    end
+    i = i + 1
+end
+