From 0a8b716ae27c4930a962d0c81beeb2049daaa4f8 Mon Sep 17 00:00:00 2001
From: vipoll <vipollmail@gmail.com>
Date: Sun, 18 Aug 2024 22:09:53 +0400
Subject: [PATCH] draw arrows to indicate line sides in sine (the lines push
 bodies only in one direction)

---
 src/mobileapplication3/elements/Sine.java | 33 +++++++++++++++++++++++
 src/mobileapplication3/utils/Utils.java   |  9 +++----
 2 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/src/mobileapplication3/elements/Sine.java b/src/mobileapplication3/elements/Sine.java
index 847b5c8..fc7ae83 100644
--- a/src/mobileapplication3/elements/Sine.java
+++ b/src/mobileapplication3/elements/Sine.java
@@ -5,7 +5,10 @@
  */
 package mobileapplication3.elements;
 
+import javax.microedition.lcdui.Graphics;
+
 import mobileapplication3.utils.Mathh;
+import mobileapplication3.utils.Utils;
 
 /**
  *
@@ -334,4 +337,34 @@ public void recalcCalculatedArgs() {
     	calcAnchorPoint();
     }
     
+    public void paint(Graphics g, int zoomOut, int offsetX, int offsetY) {
+        if (pointsCache == null) {
+            genPoints();
+        }
+        
+        if (pointsCache.getSize() == 0) {
+        	return;
+        }
+        
+        short[] startPoint = pointsCache.getPoint(0);
+        for (int i = 0; i < pointsCache.getSize() - 1; i++) {
+            short[] endPoint = pointsCache.getPoint(i+1);
+            int x1 = xToPX(startPoint[0], zoomOut, offsetX);
+            int y1 = yToPX(startPoint[1], zoomOut, offsetY);
+            int x2 = xToPX(endPoint[0], zoomOut, offsetX);
+            int y2 = yToPX(endPoint[1], zoomOut, offsetY);
+            Utils.drawLine(g, x1, y1, x2, y2, LINE_THICKNESS, zoomOut);
+            if (i % 2 == 0) {
+	            int dx = x2 - x1;
+	            int dy = y2 - y1;
+	            int l = Mathh.calcDistance(dx, dy);
+	            int centerX = (x1 + x2) / 2;
+	            int centerY = (y1 + y2) / 2;
+	            int lzoomout = l * zoomOut;
+	            Utils.drawArrow(g, centerX, centerY, centerX + dy * 50000 / lzoomout, centerY - dx * 50000 / lzoomout, LINE_THICKNESS/6, zoomOut);
+            }
+            startPoint = endPoint;
+        }
+    }
+    
 }
diff --git a/src/mobileapplication3/utils/Utils.java b/src/mobileapplication3/utils/Utils.java
index 981cdff..f81319b 100644
--- a/src/mobileapplication3/utils/Utils.java
+++ b/src/mobileapplication3/utils/Utils.java
@@ -127,11 +127,10 @@ public static String replace(String _text, String _searchStr, String _replacemen
     public static void drawArrow(Graphics g, int x1, int y1, int x2, int y2, int thickness, int zoomOut) {
         int dx = x2 - x1;
         int dy = y2 - y1;
-        int ang = Mathh.arctg(dx, dy);
-        int arrowX = (x2*9 + x1) / 10;
-        int arrowY = (y2*9 + y1) / 10;
-        int arrowSideVecX = 2 * thickness * Mathh.cos(ang + 90) / zoomOut;
-        int arrowSideVecY = 2 * thickness * Mathh.sin(ang + 90) / zoomOut;
+        int arrowX = (x2*5 + x1) / 6;
+        int arrowY = (y2*5 + y1) / 6;
+        int arrowSideVecX = dy / 8;
+        int arrowSideVecY = -dx / 8;
         drawLine(g, x1, y1, arrowX, arrowY, thickness, zoomOut, false, false);
         drawTriangle(g, x2, y2, arrowX + arrowSideVecX, arrowY + arrowSideVecY, arrowX - arrowSideVecX, arrowY - arrowSideVecY, zoomOut);
     }