Initial commit

lines_functions.c

@@ -0,0 +1,95 @@
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "stm32f7xx_hal.h"
+#include "nokia.h"
+#define NUMBER_OF_LINES 20
+
+typedef struct						// LINE STRUCTURE
+{
+	int8_t x1;						///< first point X pos
+	int8_t y1;						///< first point y pos
+	int8_t x2;						///< second point X pos
+	int8_t y2;						///< second point Y pos
+} LINE;
+LINE lines[NUMBER_OF_LINES];		// the lines
+uint32_t toClear,toDraw;
+
+LINE directions =
+{ 1, 2, 3, 4 };						// the point of lines directions
+
+
+
+
+///////////////////////////////////////////////////////////////////////////////
+/// \brief Calculate the new line X position
+/// \param pos the pointer to new position
+/// \param dir the pointer to the new direction
+///////////////////////////////////////////////////////////////////////////////
+static void CalcNewLineX(int8_t * pos, int8_t * dir)
+{
+	int8_t temp;
+
+	temp = *pos + *dir; 				// new position calcul
+	if ((temp > 83) || (temp < 0)) 		// check limit bounds
+	{
+		if (*dir > 0) 					// was going left to right
+		{
+			*dir = 0 - ((rand() * 3 / RAND_MAX) + 1); 	// change direction
+		}
+		else 							// was going right to left
+		{
+			*dir = (rand() * 3 / RAND_MAX) + 1; 		// change direction
+
+		}
+		temp = *pos + *dir; 			// recalculate new position
+	}
+	*pos = temp; 						// change position
+}
+
+///////////////////////////////////////////////////////////////////////////////
+/// \brief Calculate the new line Y position
+/// \param pos the pointer to new position
+/// \param dir the pointer to the new direction
+///////////////////////////////////////////////////////////////////////////////
+static void CalcNewLineY(int8_t * pos, int8_t * dir)
+{
+	int8_t temp;
+
+	temp = *pos + *dir; 				// new position calcul
+	if ((temp > 47) || (temp < 0)) 		// check limit bounds
+	{
+		if (*dir > 0) 					// was going top to bottom
+		{
+			*dir = 0 - ((rand() * 1 / RAND_MAX) + 1); 	// change direction
+		}
+		else 							// was going bottom to top
+		{
+			*dir = (rand() * 1 / RAND_MAX) + 1;			 // change direction
+
+		}
+		temp = *pos + *dir; 			// recalculate new position
+	}
+	*pos = temp; 						// change position
+}
+
+
+void ScreenSaver(void)
+{
+		 toClear = (toDraw + 1)%NUMBER_OF_LINES; 	// next line to clear
+		 //--------------------------------------------------------------------
+		 // clear oldest line
+		 NokiaDrawLine(lines[toClear].x1,lines[toClear].y1,
+				lines[toClear].x2,lines[toClear].y2,0);
+		 //--------------------------------------------------------------------
+		 // draw newest line
+		 NokiaDrawLine(lines[toDraw].x1,lines[toDraw].y1,
+				lines[toDraw].x2,lines[toDraw].y2,1);
+		 //--------------------------------------------------------------------
+		 lines[toClear] = lines[toDraw]; // for calculation of new line
+		 CalcNewLineX(&lines[toClear].x1,&directions.x1);
+		 CalcNewLineX(&lines[toClear].x2,&directions.x2);
+		 CalcNewLineY(&lines[toClear].y1,&directions.y1);
+		 CalcNewLineY(&lines[toClear].y2,&directions.y2);
+		 toDraw = toClear; 				// next line to draw
+}