Fan speed interpolation

src/main/java/eu/tankernn/grid/model/FanSpeedProfile.java

@@ -5,56 +5,64 @@ import java.util.Arrays;
 public class FanSpeedProfile {
 	public static final int STEPS = 5;
 	public static final double MAX_TEMP = 80, MIN_TEMP = 30, STEP_SIZE = (MAX_TEMP - MIN_TEMP) / (double) STEPS;
-
+	
 	private String name;
 	private int[] percentages;
 	private int cpuWeightPercent, gpuWeightPercent;
-
+	
 	public FanSpeedProfile(String name, int[] percentages, int cpuWeight) {
 		this.setName(name);
 		this.setPercentages(percentages);
 		this.setCpuWeight(cpuWeight);
 	}
-
+	
 	public int getSpeedPercentage(double cpuTemp, double gpuTemp) {
 		double temp = (cpuTemp * cpuWeightPercent + gpuTemp * gpuWeightPercent) / 100;
-		double currentTemp = MIN_TEMP;
-
-		for (int i : getPercentages()) {
-			if (temp < currentTemp) {
-				return i;
-			}
-			currentTemp += STEP_SIZE;
-		}
-
-		return getPercentages()[getPercentages().length - 1];
+		
+		int lowerIndex = (int) ((temp - MIN_TEMP) / STEP_SIZE);
+		
+		if (lowerIndex < 0)
+			return getPercentages()[0];
+		else if (lowerIndex > percentages.length - 2)
+			return getPercentages()[percentages.length - 1];
+		
+		double lowerTemp = getPercentages()[lowerIndex];
+		double higherTemp = getPercentages()[lowerIndex + 1];
+		
+		double delta = higherTemp - lowerTemp;
+		
+		double progress = (temp % STEP_SIZE) / STEP_SIZE;
+		
+		double leftOver = delta * progress;
+		
+		return (int) (lowerTemp + leftOver);
 	}
-
+	
 	@Override
 	public String toString() {
 		return getName() + ": " + Arrays.toString(getPercentages());
 	}
-
+	
 	public String getName() {
 		return name;
 	}
-
+	
 	public void setName(String name) {
 		this.name = name;
 	}
-
+	
 	public int[] getPercentages() {
 		return percentages;
 	}
-
+	
 	public void setPercentages(int[] percentages) {
 		this.percentages = percentages;
 	}
-
+	
 	public int getCpuWeight() {
 		return cpuWeightPercent;
 	}
-
+	
 	public void setCpuWeight(int cpuWeight) {
 		this.cpuWeightPercent = cpuWeight;
 		this.gpuWeightPercent = 100 - cpuWeight;