Diff: widgets/EACompass.cpp

Revision:

4:f8f7f4f9c58d

Child:

7:6cf21b018420

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/widgets/EACompass.cpp	Mon Apr 26 21:37:54 2010 +0000
@@ -0,0 +1,75 @@
+// Copyright 2010 Richard Parker
+
+#include "mbed.h"
+
+#include "EACompass.h"
+
+#include "../graphics/EAPen.h"
+#include "../graphics/EAColor.h"
+#include "../screen/EALCD.h"
+
+EACompass::EACompass( short x, 
+              short y, 
+              unsigned short diameter, 
+              unsigned short angle)
+{
+    setX(x);
+    setY(y);
+    setWidth(diameter);
+    setHeight(diameter);
+    
+    setAngle(angle);    
+}
+
+EACompass::~EACompass()
+{
+}
+
+void EACompass::paint(EALCD& lcd)
+{
+    // Draw the outer ring.
+    lcd.drawFilledEllipse(x(), y(), diameter(), diameter());
+    
+    // Now draw the pointer.
+    _drawPointer(lcd);
+}
+
+void EACompass::update(EALCD& lcd, float angle)
+{
+    // Clear the old pointer.
+    EAColor oldColour = lcd.pen().color();
+    EAColor bg = lcd.brush().color();
+    EAPen p;
+    
+    p.setColor(bg);
+    lcd.setPen(p);    
+
+    _drawPointer(lcd);
+    
+    p.setColor(oldColour);
+    lcd.setPen(p);
+  
+    // Now set the new angle and draw the pointer.
+    setAngle(angle);
+    
+    _drawPointer(lcd);
+}
+
+void EACompass::_drawPointer(EALCD& lcd)
+{
+    unsigned short r = diameter()/2;
+    unsigned short h = r - 10;
+    short oy = h * sin(angle());
+    short ox = h * cos(angle());
+    
+    short x0 = r + x() - ox;
+    short y0 = r + y() + oy;
+    short x1 = r + x() + ox;
+    short y1 = r + y() - oy;
+    
+    // Draw main line.        
+    lcd.drawLine(x0, y0, x1, y1);
+    
+    // Draw ball at north end.
+    lcd.drawFilledEllipse(x1-5, y1-5, 10, 10);
+}