1 files changed, 97 insertions, 0 deletions
diff --git a/drawing.ino b/drawing.ino
new file mode 100644
index 0000000..b326c7f
--- /dev/null
+++ b/drawing.ino
@@ -0,0 +1,97 @@
+#include "drawing.h"
+#include "sprites.h"
+#include "maxCommands.h"
+
+/* Draw sprite to screen 
+ *
+ *	layer:	16x8 bit buffer
+ * 	x, y:	Position on screen
+ * 	sprite:	Sprite to draw
+ */
+void drawSprite(uint8_t layer[], uint8_t x, uint8_t y, struct Sprite* sprite) {
+	/* Check if in range */
+	if( x + sprite->width > 8 || y + sprite->height > 16) 
+		return;
+
+	/* Or buffer with sprite */
+	for (int i = y; i < sprite->height + y; i++) {
+		layer[i] |= sprite->buff[i - y] >> x;
+	}
+}
+
+/* Clear specified buffer */
+void clearBuffer(uint8_t layer[] ) {
+	for( int i = 0; i < BUFF_HEIGHT; i++ ) {
+		layer[i] = 0;
+	}
+}
+
+/* Render specfied screenbuffer
+ *
+ *	device:	Which screen
+ *	where:	It render the next 8 bytes from this index
+ */
+void render(int device, uint8_t screenBuffer[], unsigned int where) {
+
+	static uint8_t onScreen[BUFF_HEIGHT];
+	static unsigned long reRenderLast;
+
+	int i;
+	uint8_t toWrite;
+
+	/* Completely rerender every one second */
+	bool reRender = (millis() - reRenderLast ) > REDRAW_TIME;
+
+	/* Will draw 8 lines from /where/. */
+	for(i = where; i < (where + 8); i++) {
+		toWrite = screenbuffer[i];
+
+		/* Check if whats on screen is the same */
+		if(onScreen[i] == toWrite && !reRender) 
+			continue;
+
+		writeCommand(device, maxDIGIT_0 + i - where, toWrite);
+
+		/* Keep track of whats on screen */
+		onScreen[i] = toWrite;
+	}
+
+	if(reRender)
+		reRenderLast = millis();
+	
+}
+
+/* Write a register to specified display */
+static void writeCommand(int display, uint8_t addr, uint8_t data) {
+	/* Chip select low */
+	digitalWrite(CS, LOW);
+
+	/* Shift out the data, to the max shift registers
+	 * MSBFIRST makes the MSB go first out */
+	shiftOut(DATA_IN, CLK, MSBFIRST, addr);
+	shiftOut(DATA_IN, CLK, MSBFIRST, data);
+
+	/* If the device is number two, the commands should be shiftet through
+	 * Each MAX, holds 16 bits(2 bytes) */
+	serialPad(curDisplay * 2);
+
+	digitalWrite(CS, HIGH);
+
+	/* Before writing new commands, all the buffers should be cleaned */
+	serialPad(NUM_DISPLAY * 2);
+
+}
+
+/* Init specified display */
+void initDisplays(int display) {
+	
+}
+
+/* Send x amount of empty bytes, recursively(for fun)*/
+static void serialPad(int count) {
+	shiftOut(DATA_IN, CLK, MSBFIRST, 0);
+
+	if ( count )
+		serialPad(count-1);
+}
+