added graph demo

demos/graph/main.c

@@ -0,0 +1,51 @@
+#include "ch.h"
+#include "hal.h"
+#include "gdisp.h"
+#include "graph.h"
+#include "math.h"
+
+int data[5][2] = {
+	{ 0, 0 },
+	{ 10, 10 },
+	{ 20, 20 },
+	{ 30, 30 },
+	{ 40, 40 }
+};
+
+int main(void) {
+	halInit();
+	chSysInit();
+
+	gdispInit();
+	gdispSetOrientation(GDISP_ROTATE_90);
+	gdispClear(Black);
+	
+	Graph G1 = {
+		gdispGetWidth()/2,
+		gdispGetHeight()/2,
+		-150,
+		150,
+		-110,
+		110,
+		21,
+		5,
+		TRUE,
+		TRUE,
+		White,
+		Grey,
+	};
+
+	graphDrawSystem(&G1);
+	
+	uint16_t i;
+	for(i = 0; i < 2500; i++)
+		graphDrawDot(&G1, i-170, 80*sin(2*0.2*M_PI*i/180), 1, Blue);
+
+	for(i = 0; i < 2500; i++)
+		graphDrawDot(&G1, i/5-150, 95*sin(2*0.2*M_PI*i/180), 1, Green);
+
+	while(TRUE) {
+		chThdSleepMilliseconds(100);	
+	}
+}
+