1 files changed, 68 insertions, 0 deletions
diff --git a/src/main/java/io/github/moulberry/notenoughupdates/util/LerpingFloat.java b/src/main/java/io/github/moulberry/notenoughupdates/util/LerpingFloat.java
new file mode 100644
index 00000000..83fa1a6d
--- /dev/null
+++ b/src/main/java/io/github/moulberry/notenoughupdates/util/LerpingFloat.java
@@ -0,0 +1,68 @@
+package io.github.moulberry.notenoughupdates.util;
+
+public class LerpingFloat {
+
+    private int timeSpent;
+    private long lastMillis;
+    private int timeToReachTarget;
+
+    private float targetValue;
+    private float lerpValue;
+
+    public LerpingFloat(float initialValue, int timeToReachTarget) {
+        this.targetValue = this.lerpValue = initialValue;
+        this.timeToReachTarget = timeToReachTarget;
+    }
+
+    public LerpingFloat(int initialValue) {
+        this(initialValue, 200);
+    }
+
+    public void tick() {
+        int lastTimeSpent = timeSpent;
+        this.timeSpent += System.currentTimeMillis() - lastMillis;
+
+        float lastDistPercentToTarget = lastTimeSpent/(float)timeToReachTarget;
+        float distPercentToTarget = timeSpent/(float)timeToReachTarget;
+        float fac = (1-lastDistPercentToTarget)/lastDistPercentToTarget;
+
+        float startValue = lerpValue - (targetValue - lerpValue)/fac;
+
+        float dist = targetValue - startValue;
+        if(dist == 0) return;
+
+        float oldLerpValue = lerpValue;
+        if(distPercentToTarget >= 1) {
+            lerpValue = targetValue;
+        } else {
+            lerpValue = startValue + dist*distPercentToTarget;
+        }
+
+        if(lerpValue == oldLerpValue) {
+            timeSpent = lastTimeSpent;
+        } else {
+            this.lastMillis = System.currentTimeMillis();
+        }
+    }
+
+    public void resetTimer() {
+        this.timeSpent = 0;
+        this.lastMillis = System.currentTimeMillis();
+    }
+
+    public void setTarget(float targetValue) {
+        this.targetValue = targetValue;
+    }
+
+    public void setValue(float value) {
+        this.targetValue = this.lerpValue = value;
+    }
+
+    public float getValue() {
+        return lerpValue;
+    }
+
+    public float getTarget() {
+        return targetValue;
+    }
+}