From 3c1641536c10b672b336aefa1fdc3b354a37d240 Mon Sep 17 00:00:00 2001
From: Yu Nejigane <yu.nejigane@gmail.com>
Date: Fri, 1 Feb 2013 02:28:55 +0900
Subject: [PATCH] Added ChartView

---
 ChartView.cpp  | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++
 ChartView.h    | 25 ++++++++++++++++++
 SliderView.cpp |  2 +-
 3 files changed, 95 insertions(+), 1 deletion(-)
 create mode 100644 ChartView.cpp
 create mode 100644 ChartView.h

diff --git a/ChartView.cpp b/ChartView.cpp
new file mode 100644
index 0000000..3ff08d4
--- /dev/null
+++ b/ChartView.cpp
@@ -0,0 +1,69 @@
+#include "ChartView.h"
+
+namespace minimal {
+
+ChartView::ChartView(const char* name, int16_t min, int16_t max) 
+  : View(name), min_(min), max_(max), value_(0) {
+  if (min_ > max_) {
+    int16_t tmp = min_;
+    min_ = max_;
+    max_ = tmp;
+  }
+  memset(history_, 0, sizeof(history_));
+}
+
+void ChartView::drawChart() {
+  uint8_t buffer[100] = {0};
+  
+  for (uint8_t i = 0; i < 4; ++i) {
+    uint8_t offset = (3 - i) * 8;
+    memset(buffer, 0, sizeof(buffer));
+    for (uint8_t j = 0; j < 100; ++j) {
+      if (history_[j] + 4 > offset) {
+        uint8_t diff = history_[j] + 4 - offset;
+        if (diff >= 8) {
+          buffer[j] = 255;
+        } else {
+          for (uint8_t k = 0; k < diff; ++k) buffer[j] = (buffer[j] >> 1) | 128;
+        }
+      }
+    }
+    if (i == 3) {
+      for (uint8_t j = 0; j < 100; ++j) buffer[j] &= 15;
+    }
+    AD12864SPI::write(i + 2, 14, buffer, 100);
+  }
+}
+
+void ChartView::drawValue() {
+  char number[7];
+  sprintf(number, "%6d", value_);
+  uint8_t buffer[Font::GLYPH_WIDTH * 6] = {0};
+  uint8_t bufferLength = Font::GLYPH_WIDTH * 6;
+  Font::getData(number, buffer, bufferLength, true);
+  AD12864SPI::write(6, 20, buffer, bufferLength);
+  memset(buffer, 0, sizeof(buffer));
+  Font::getData(number, buffer, bufferLength, false);
+  AD12864SPI::write(7, 20, buffer, bufferLength);
+}
+
+void ChartView::update(int16_t value) {
+  value_ = value;
+  if (value_ < min_) value_ = min_;
+  if (value_ > max_) value_ = max_;
+
+  for (uint8_t i = 0; i < 99; ++i) history_[i] = history_[i + 1];
+  
+  uint16_t a = value_ - min_;
+  uint16_t b = max_ - min_;    
+  history_[99] = b == 0 ? 24 : a * 24 / b;
+}
+
+void ChartView::draw() {
+  View::draw();
+  drawOkButton(true);
+  drawChart();
+  drawValue();
+}
+
+}
\ No newline at end of file
diff --git a/ChartView.h b/ChartView.h
new file mode 100644
index 0000000..daabdb8
--- /dev/null
+++ b/ChartView.h
@@ -0,0 +1,25 @@
+#ifndef __MINIMAL_CHARTVIEW_H__
+#define __MINIMAL_CHARTVIEW_H__
+
+#include "View.h"
+
+namespace minimal {
+
+class ChartView : public View {
+protected:
+  uint8_t history_[100];
+  int16_t min_;
+  int16_t max_;
+  int16_t value_;
+  void drawValue();
+  void drawChart();
+
+public:
+  ChartView(const char* name, int16_t min = 0, int16_t max = 1023);
+  virtual void draw();
+  void update(int16_t value);
+};
+
+}
+
+#endif
diff --git a/SliderView.cpp b/SliderView.cpp
index 8cb4fce..d1672f9 100644
--- a/SliderView.cpp
+++ b/SliderView.cpp
@@ -34,7 +34,7 @@ void SliderView::drawValue() {
 void SliderView::drawSlider() {
   uint16_t a = value_ - min_;
   uint16_t b = max_ - min_;
-  uint16_t barLength = a * 100 / b;
+  uint16_t barLength = b == 0 ? 100 : a * 100 / b;
   
   uint8_t buffer[AD12864SPI::COLUMN_SIZE] = {0};
   buffer[12] = 254;