Diff: LinearCharacteristics.cpp

Revision:

5:75dc97c6c98e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/LinearCharacteristics.cpp	Fri Apr 23 05:32:49 2021 +0000
@@ -0,0 +1,58 @@
+#include "LinearCharacteristics.h"
+
+LinearCharacteristics::LinearCharacteristics(float gain, float offset)
+{
+    setup(gain, offset);
+}
+
+LinearCharacteristics::LinearCharacteristics(float x0, float x1, float y0, float y1)
+{
+    setup(x0, x1, y0, y1);
+}
+
+LinearCharacteristics::LinearCharacteristics(float x0, float x1, float y0, float y1, float yMin, float yMax)
+{
+    setup(x0, x1, y0, y1, yMin, yMax);
+}
+
+LinearCharacteristics::~LinearCharacteristics() {}
+
+float LinearCharacteristics::evaluate(float x)
+{
+    float y = this->gain*(x - this->offset);
+    if(y > this->yMax)
+        y = this->yMax;
+    if(y < this->yMin)
+        y = this->yMin;
+    return y;
+}
+
+void LinearCharacteristics::setup(float gain, float offset)
+{
+    this->gain = gain;
+    this->offset = offset;
+    this->yMin = -999999.0;
+    this->yMax =  999999.0;
+}
+
+void LinearCharacteristics::setup(float x0, float x1, float y0, float y1)
+{
+    this->gain = (y1 - y0)/(x1 - x0);
+    this->offset = x1 - y1/this->gain;
+    this->yMin = -999999.0;
+    this->yMax =  999999.0;
+}
+
+void LinearCharacteristics::setup(float x0,float x1, float y0, float y1, float yMin, float yMax)
+{
+    this->gain = (y1 - y0)/(x1 - x0);
+    this->offset = x1 - y1/this->gain;
+    this->yMin = yMin;
+    this->yMax = yMax;
+}
+
+void LinearCharacteristics::correctExistingOffset(float y_offset)
+{
+    if(gain > 0.0) this->offset = this->offset + 1.0/(this->gain)*y_offset;
+}
+