paint.cc: Simplify drawing line (#1643)

* simplify drawing line

* remove space
old-commit-hash: ff4f432f0f

selfdrive/ui/paint.cc

@@ -128,20 +128,12 @@ static void draw_lead(UIState *s, const cereal::RadarState::LeadData::Reader &le
 }
 
 static void ui_draw_lane_line(UIState *s, const model_path_vertices_data *pvd, NVGcolor color) {
+  if (pvd->cnt == 0) return;
+
   nvgBeginPath(s->vg);
-  bool started = false;
-  for (int i=0; i<pvd->cnt; i++) {
-    float x = pvd->v[i].x;
-    float y = pvd->v[i].y;
-    if (x < 0 || y < 0.) {
-      continue;
-    }
-    if (!started) {
-      nvgMoveTo(s->vg, x, y);
-      started = true;
-    } else {
-      nvgLineTo(s->vg, x, y);
-    }
+  nvgMoveTo(s->vg, pvd->v[0].x, pvd->v[0].y);
+  for (int i=1; i<pvd->cnt; i++) {
+    nvgLineTo(s->vg, pvd->v[i].x, pvd->v[i].y);
   }
   nvgClosePath(s->vg);
   nvgFillColor(s->vg, color);
@@ -214,20 +206,12 @@ static void update_all_track_data(UIState *s) {
 
 
 static void ui_draw_track(UIState *s, bool is_mpc, track_vertices_data *pvd) {
+ if (pvd->cnt == 0) return;
+
   nvgBeginPath(s->vg);
-  bool started = false;
-  for(int i = 0;i < pvd->cnt;i++) {
-    float x = pvd->v[i].x;
-    float y = pvd->v[i].y;
-    if (x < 0 || y < 0) {
-      continue;
-    }
-    if (!started) {
-      nvgMoveTo(s->vg, x, y);
-      started = true;
-    } else {
-      nvgLineTo(s->vg, x, y);
-    }
+  nvgMoveTo(s->vg, pvd->v[0].x, pvd->v[0].y);
+  for (int i=1; i<pvd->cnt; i++) {
+    nvgLineTo(s->vg, pvd->v[i].x, pvd->v[i].y);
   }
   nvgClosePath(s->vg);