From faf4f528b3dcf6d09efb040be3de3db8ae872355 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Mikael=20Degerf=C3=A4lt?= <micke@demicode.se>
Date: Wed, 26 Jun 2019 17:50:34 +0200
Subject: [PATCH] Custom draw function for curve to show the form and not just
 name

Draw the curve as well as the name of curve. Could be optimised a bit by not evaluating the curve every pixel, but something like every third pixel. Could also draw dots instead of lines if we need extra speed.
---
 NuEVI/NuEVI.ino |  6 +++---
 NuEVI/globals.h |  5 +++++
 NuEVI/menu.cpp  | 40 +++++++++++++++++++++++++++-------------
 3 files changed, 35 insertions(+), 16 deletions(-)

diff --git a/NuEVI/NuEVI.ino b/NuEVI/NuEVI.ino
index 2700dbc..4f7cf5c 100644
--- a/NuEVI/NuEVI.ino
+++ b/NuEVI/NuEVI.ino
@@ -157,7 +157,7 @@ static const unsigned short curveM4[] = {0,4300,7000,8700,9900,10950,11900,12600
 static const unsigned short curveM3[] = {0,2900,5100,6650,8200,9500,10550,11500,12300,13100,13800,14450,14950,15350,15750,16150,16383};
 static const unsigned short curveM2[] = {0,2000,3600,5000,6450,7850,9000,10100,11100,12100,12900,13700,14400,14950,15500,16000,16383};
 static const unsigned short curveM1[] = {0,1400,2850,4100,5300,6450,7600,8700,9800,10750,11650,12600,13350,14150,14950,15650,16383};
-static const unsigned short curveIn[] = {0,1023,2047,3071,4095,5119,6143,7167,8191,9215,10239,11263,12287,13311,14335,15359,16383};
+const unsigned short curveIn[] = {0,1023,2047,3071,4095,5119,6143,7167,8191,9215,10239,11263,12287,13311,14335,15359,16383};
 static const unsigned short curveP1[] = {0,600,1350,2150,2900,3800,4700,5600,6650,7700,8800,9900,11100,12300,13500,14850,16383};
 static const unsigned short curveP2[] = {0,400,800,1300,2000,2650,3500,4300,5300,6250,7400,8500,9600,11050,12400,14100,16383};
 static const unsigned short curveP3[] = {0,200,500,900,1300,1800,2350,3100,3800,4600,5550,6550,8000,9500,11250,13400,16383};
@@ -172,8 +172,8 @@ static const unsigned short curveZ2[] = {0,2000,3200,3800,4096,4800,5100,5900,66
 
 const unsigned short* const curves[] = {
    curveM4, curveM3, curveM2, curveM1, curveIn, curveP1, curveP2,
-   curveP3, curveP4 , curveS1, curveS2, curveZ1, curveZ2 };
-
+   curveP3, curveP4 , curveS1, curveS2, curveZ1, curveZ2
+};
 
 int vibThr;          // this gets auto calibrated in setup
 int vibThrLo;
diff --git a/NuEVI/globals.h b/NuEVI/globals.h
index 6ec0e44..dd42168 100644
--- a/NuEVI/globals.h
+++ b/NuEVI/globals.h
@@ -26,6 +26,9 @@
 #define DNWD 0
 
 
+extern const unsigned short* const curves[];
+extern const unsigned short curveIn[];
+
 extern unsigned short breathThrVal;
 extern unsigned short breathMaxVal;
 extern unsigned short portamThrVal;
@@ -110,4 +113,6 @@ extern byte halfPitchBendKey;
 extern byte specialKey;
 extern byte pinkyKey;
 
+extern unsigned int multiMap(unsigned short val, const unsigned short * _in, const unsigned short * _out, uint8_t size);
+
 #endif
diff --git a/NuEVI/menu.cpp b/NuEVI/menu.cpp
index cb88b0d..e0735e0 100644
--- a/NuEVI/menu.cpp
+++ b/NuEVI/menu.cpp
@@ -1,14 +1,16 @@
-#include "menu.h"
-#include "hardware.h"
-#include "config.h"
-#include "globals.h"
-#include "midi.h"
 
 #include <EEPROM.h>
 #include <Adafruit_GFX.h>
 #include <Adafruit_SSD1306.h>
 #include <Adafruit_MPR121.h>
+#include <Arduino.h>
+
+#include "menu.h"
 #include "settings.h"
+#include "hardware.h"
+#include "config.h"
+#include "globals.h"
+#include "midi.h"
 #include "numenu.h"
 
 enum CursorIdx {
@@ -600,15 +602,27 @@ const MenuEntrySub velocityMenu = {
   , nullptr
 };
 
+static void curveCustomDraw(SubMenuRef __unused, char* __unused out, const char** __unused unit) {
+  const char* curveMenuLabels[] = {"-4", "-3", "-2", "-1", "LIN", "+1", "+2",
+                                        "+3", "+4", "S1", "S2", "Z1", "Z2" };
+  int y0 = 0, x0 = 0;
+  int scale = ((1<<14)-1)/60;
+  for(int x = x0; x < 60; x+=1) {
+    int y = multiMap(x*scale, curveIn, curves[curve], 17);
+    y = (y*37) / ((1<<14)-1);
+    display.drawLine(x0 + 65, 60 - y0, x + 65, 60 - y, WHITE);
+    x0 = x; y0 = y;
+  }
+  display.setCursor(125 - 3*6, 60-8 );
+  display.setTextSize(0);
+  display.print(curveMenuLabels[curve]);
+}
+
+static void curveWriteSettings(const MenuEntrySub & __unused sub){ writeSetting(BREATHCURVE_ADDR,curve); }
+
 const MenuEntrySub curveMenu = {
-  MenuType::ESub, "CURVE", "CURVE", &curve, 0, 12, MenuEntryFlags::EMenuEntryWrap,
-  [](SubMenuRef __unused, char* out, const char** __unused unit) {
-    const char* curveMenuLabels[] = {"-4", "-3", "-2", "-1", "LIN", "+1", "+2",
-                                         "+3", "+4", "S1", "S2", "Z1", "Z2" };
-    strncpy(out, curveMenuLabels[curve], 4);
-  },
-  [](const MenuEntrySub & __unused sub){ writeSetting(BREATHCURVE_ADDR,curve); }
-  , nullptr
+  MenuType::ESub, "CURVE", "CURVE", &curve, 0, 12, MenuEntryFlags::EMenuEntryWrap | MenuEntryFlags::EMenuEntryCustom,
+  curveCustomDraw, curveWriteSettings, nullptr
 };
 
 const MenuEntrySub velSmpDlMenu = {