fadout parameter for echo trails

1 files changed, 4 insertions, 2 deletions

diff --git a/rotord/src/nodes_channels.h b/rotord/src/nodes_channels.h
index 8fca6a0..20fc86c 100644
--- a/rotord/src/nodes_channels.h
+++ b/rotord/src/nodes_channels.h
@@ -444,6 +444,7 @@ namespace Rotor {
 				}
 				int interval=(int)parameters["interval"]->value;
 				int thisframe=((Time_spec)frame).frame();
+				int duration=(int)parameters["number"]->value*interval;
 				//iterate cache and throw out any obsolete frames
 				auto i = std::begin(images);
 				while (i != std::end(images)) {
@@ -465,7 +466,7 @@ namespace Rotor {
 						image=*(in);
 						images[thisframe]=new Image(frame.w,frame.h);
 						apply_LUT(image,*(images[thisframe]));
-						for (int i=1;i<(int)parameters["number"]->value*interval;i+=interval){
+						for (int i=1;i<duration;i+=interval){
 							//check echo frame isn't at negative time
 							int absframe=thisframe-i;
 							if (absframe>-1){
@@ -478,7 +479,8 @@ namespace Rotor {
 									else images[absframe]->clear();
 								}
 								if (fless(1.0f,parameters["fadeto"]->value)){
-									float amount=(((parameters["number"]->value-i)/parameters["number"]->value)*(1.0f-parameters["fadeto"]->value))+(1.0f-parameters["fadeto"]->value);
+									float fadetime=((float)i)/((float)duration); //0 to 1
+									float amount=1.0f-(fadetime*(1.0f-parameters["fadeto"]->value));
 									Image *temp=*images[absframe]*amount;
 									if (attributes["mode"]->value=="screen") {
 										image+=*temp;