Patch: [ #5036 ] IPO Curve Mirroring by Joshua Leung (aligorith)

This patch adds the feature of IPO curve mirroring. It mirrors the selected keyframes in the active ipo curves over a user-nominated mirror-line.

Options are:
- Mirror over current frame
- Mirror over vertical axis (X = 0)
- Mirror over horizontal axis (Y = 0)

Functionality can be accessed from:
- Hotkey M in IPO editor
- Submenu in header of IPO editor

source/blender/include/BSE_editipo.h

@@ -96,6 +96,8 @@ void join_ipo_menu(void);
 void join_ipo(int mode);
 void ipo_snap_menu(void);
 void ipo_snap(short event);
+void ipo_mirror_menu(void);
+void ipo_mirror(short event);
 void mouse_select_ipo(void);
 void sethandles_ipo(int code);
 void select_ipo_bezier_keys(struct Ipo *ipo, int selectmode);

source/blender/src/editipo.c

@@ -100,6 +100,7 @@
 
 #include "BDR_drawobject.h"
 #include "BDR_editobject.h"
+#include "BDR_editcurve.h" 	// for bezt_compare 
 
 #include "BSE_trans_types.h"
 #include "BSE_editipo_types.h"
@@ -3073,6 +3074,91 @@ void ipo_snap(short event)
 	BIF_undo_push("Snap Ipo");
 }
 
+void ipo_mirror_menu(void)
+{
+	int mode = 0;
+	mode= pupmenu("Mirror Over%t|Current Frame%x1|Vertical Axis%x2|Horizontal Axis%x3");
+	
+	if (mode == -1) return;
+	
+	ipo_mirror(mode);
+}
+
+void ipo_mirror(short mode)
+{
+	EditIpo *ei;
+	BezTriple *bezt;
+	
+	int a, b;
+	int ok, ok2;
+	float diff;
+	
+	/* what's this for? */
+	get_status_editipo();
+
+	/* get edit ipo */
+	ei= G.sipo->editipo;
+	if (!ei) return;
+	
+	/* look throught ipo curves */
+	for(b=0; b<G.sipo->totipo; b++, ei++) {
+		if (ISPOIN3(ei, flag & IPO_VISIBLE, icu, icu->bezt)) {
+		
+			ok2= 0;
+			if(G.sipo->showkey) ok2= 1;
+			else if(totipo_vert && (ei->flag & IPO_EDIT)) ok2= 2;
+			else if(totipo_vert==0 && (ei->flag & IPO_SELECT)) ok2= 3;
+			
+			if(ok2) {
+				bezt= ei->icu->bezt;
+				a= ei->icu->totvert;
+				
+				/* loop through beztriples, mirroring them */
+				while(a--) {
+					ok= 0;
+					if(totipo_vert) {
+						if(bezt->f2 & 1) ok= 1;
+					}
+					else ok= 1;
+					
+					if(ok) {
+						switch (mode) {
+							case 1: /* mirror over current frame */
+							{
+								diff= ((float)CFRA - bezt->vec[1][0]);
+								bezt->vec[1][0]= ((float)CFRA + diff);
+							}
+								break;
+							case 2: /* mirror over vertical axis (frame 0) */
+							{
+								diff= (0.0f - bezt->vec[1][0]);
+								bezt->vec[1][0]= (0.0f + diff);
+							}
+								break;
+							case 3: /* mirror over horizontal axis */
+							{
+								diff= (0.0f - bezt->vec[1][1]);
+								bezt->vec[1][1]= (0.0f + diff);
+							}
+								break;
+						}
+					}
+					
+					bezt++;
+				}
+				
+				/* sort out order and handles */
+				sort_time_ipocurve(ei->icu);
+				calchandles_ipocurve(ei->icu);
+			}
+		}
+	}
+	
+	/* cleanup and undo push */
+	editipo_changed(G.sipo, 1);
+	BIF_undo_push("Mirror Ipo");
+}
+
 /*
  * When deleting an IPO curve from Python, check if the Ipo is being
  * edited and if so clear the pointer to the old curve.

source/blender/src/header_ipo.c

@@ -316,6 +316,35 @@ static uiBlock *ipo_editmenu_snapmenu(void *arg_unused)
 	return block;
 }
 
+static void do_ipo_editmenu_mirrormenu(void *arg, int event)
+{
+	switch(event) {
+		case 1: /* mirror over current frame */
+		case 2: /* mirror over frame 0 */
+		case 3: /* mirror over horizontal axis */
+			ipo_mirror(event);
+			break;
+	}
+	allqueue(REDRAWVIEW3D, 0);
+}
+
+static uiBlock *ipo_editmenu_mirrormenu(void *arg_unused)
+{
+	uiBlock *block;
+	short yco = 20, menuwidth = 120;
+
+	block= uiNewBlock(&curarea->uiblocks, "ipo_editmenu_mirrormenu", UI_EMBOSSP, UI_HELV, G.curscreen->mainwin);
+	uiBlockSetButmFunc(block, do_ipo_editmenu_mirrormenu, NULL);
+	
+	uiDefIconTextBut(block, BUTM, 1, ICON_BLANK1, "Over Current Frame|M, 1",			0, yco-=20, menuwidth, 19, NULL, 0.0, 0.0, 1, 1, "");
+	uiDefIconTextBut(block, BUTM, 1, ICON_BLANK1, "Over Vertical Axis|M, 2",			0, yco-=20, menuwidth, 19, NULL, 0.0, 0.0, 1, 2, "");
+	uiDefIconTextBut(block, BUTM, 1, ICON_BLANK1, "Over Horizontal Axis|M, 3",			0, yco-=20, menuwidth, 19, NULL, 0.0, 0.0, 1, 3, "");	
+	
+	uiBlockSetDirection(block, UI_RIGHT);
+	uiTextBoundsBlock(block, 60);
+	return block;
+} 
+
 static void do_ipo_editmenu_joinmenu(void *arg, int event)
 {
 	switch(event) {
@@ -573,6 +602,8 @@ static uiBlock *ipo_editmenu(void *arg_unused)
 	
 	uiDefIconTextBlockBut(block, ipo_editmenu_snapmenu, NULL, ICON_RIGHTARROW_THIN, "Snap", 0, yco-=20, 120, 19, "");	
 
+	uiDefIconTextBlockBut(block, ipo_editmenu_mirrormenu, NULL, ICON_RIGHTARROW_THIN, "Mirror", 0, yco-=20, 120, 19, "");	
+	
 	uiDefBut(block, SEPR, 0, "",        0, yco-=6, menuwidth, 6, NULL, 0.0, 0.0, 0, 0, "");	
 
 	/*Look to see if any ipos are being edited, so there can be a check next to the menu option*/

source/blender/src/space.c

@@ -2244,6 +2244,10 @@ static void winqreadipospace(ScrArea *sa, void *spacedata, BWinEvent *evt)
 				doredraw= 1;
 			}
 			break;
+		case MKEY:
+			if((G.qual==0))
+				ipo_mirror_menu();
+			break;
 		case NKEY:
 			toggle_blockhandler(sa, IPO_HANDLER_PROPERTIES, UI_PNL_TO_MOUSE);
 			doredraw= 1;