Initial commit

Lts/Common/LtsScriptTimeline/tools.cpp

@@ -0,0 +1,84 @@
+#include "tools.h"
+
+#include <math.h>
+
+
+namespace LtsScriptTimeline
+{
+//int   Tools::m_timelineLength = 5*60; // minimum len
+//float Tools::m_zoomFactor = 1;
+//int   Tools::m_scrollPos = 0;
+//int   Tools::m_paintWidth = 1; // rescue from possible 0-div
+
+
+int Tools::getLength(int startTime, int duration)
+{
+  return /*std::abs*/ (getPos(startTime + duration) - getPos(startTime));
+}
+
+
+int Tools::getDuration(int duration) // px => time
+{
+  double max = Tools::m_timelineLength;
+  max /= Tools::m_zoomFactor;
+
+  int paintWidth = m_paintWidth; // => 350px
+
+  double x = duration;  // => 466
+  x /= paintWidth; // => 466 / 350px  =  1,33
+  x *= max;       // => 1,33 * 300  =  400
+
+  return lrint(x);
+}
+
+
+int Tools::getTime(int pos, bool neutral) // px => time
+{
+  double visibleMax = Tools::m_timelineLength;
+  visibleMax /= Tools::m_zoomFactor;
+
+  if (!neutral)
+    visibleMax += Tools::m_scrollPos;
+
+  int visibleMin = 0;
+
+  if (!neutral)
+    visibleMin = Tools::m_scrollPos;
+
+  double diff = visibleMax - visibleMin; // => 500 - 200  =  300
+  int paintWidth = m_paintWidth; // => 350px
+
+  double x = pos;  // => 466
+  x /= paintWidth; // => 466 / 350px  =  1,33
+  x *= diff;       // => 1,33 * 300  =  400
+  x += visibleMin; // => 400 + 0
+
+  return lrint(x);
+}
+
+
+int Tools::getPos(int time, bool neutral) // time => px
+{
+  double visibleMax = Tools::m_timelineLength;
+  visibleMax /= Tools::m_zoomFactor;
+
+  if (!neutral)
+    visibleMax += Tools::m_scrollPos;
+
+  int visibleMin = 0;
+
+  if (!neutral)
+    visibleMin = Tools::m_scrollPos;
+
+  double diff = visibleMax - visibleMin; // => 500 - 200  =  300
+  int paintWidth = m_paintWidth; // => 350px
+
+  double x = time; // => 400
+  x -= visibleMin; // => 400 - 0  =  400
+  x /= diff;       // => 400 / 300  =  1,333
+  x *= paintWidth; // => 1,333 * 350px  =  466,666
+
+  return lrint(x);
+}
+
+} // namespace LtsScriptTimeline