1 files changed, 99 insertions, 0 deletions
diff --git a/scripts/ccharter.js b/scripts/ccharter.js
new file mode 100644
index 0000000..81c2dd4
--- /dev/null
+++ b/scripts/ccharter.js
@@ -0,0 +1,99 @@
+var ChordCharter = {
+	
+	drawChord: function (canvasId, originX, originY, chordName, chordFrets) {
+
+		var chord = {
+			name: chordName,
+			frets: chordFrets
+		};
+	
+		var c=document.getElementById(canvasId);
+		var ctx=c.getContext("2d");
+		ctx.fillStyle="#000";
+	
+		var origin = { x: originX, y: originY };
+		var props = { width: 50, height: 60 };
+	
+		// horizontals
+	
+		for (counter in new Array(0, 1, 2, 3, 4)) {
+			ctx.moveTo(origin.x - 1, origin.y + (counter * props.height / 4));
+			ctx.lineTo(origin.x + props.width + 1, origin.y + (counter * props.height / 4));
+			ctx.stroke();
+		}
+	
+		// verts
+	
+		for (counter in new Array(0, 1, 2, 3, 4, 5)) {
+			ctx.moveTo(origin.x + (counter * props.width / 5), origin.y);
+			ctx.lineTo(origin.x + (counter * props.width / 5), origin.y + props.height);
+			ctx.stroke();
+		}
+	
+		ctx.stroke();
+	
+		// label
+	
+		ctx.font = "bold 10pt Verdana";
+		ctx.textAlign = "center";
+		ctx.fillText(chord.name, origin.x + props.width / 2, origin.y - 5);
+		ctx.font = "7pt Verdana";
+	
+		// If any dots are after 4, adjust the root to be the lowest non-zero fret
+		// If the root is zero , thicken the top fret
+	
+		var baseFret = 0;
+		var adjBaseFret = false;
+		var lowestFret = 0;
+	
+		for (j=0; j < chord.frets.length; j++) {
+			if (chord.frets.charAt(j) != 'x' && chord.frets.charAt(j) != 'X' && chord.frets.charAt(j) > 0) {
+				if (chord.frets.charAt(j) < lowestFret || lowestFret == 0) {
+					lowestFret = chord.frets.charAt(j);
+				}
+				if (chord.frets.charAt(j) > 4) {
+					adjBaseFret = true;
+				}
+			}
+		}
+	
+		if (adjBaseFret) {
+			baseFret = lowestFret - 1;
+		}
+	
+		// dots
+	
+		var dotsize = 3.5;
+	
+		var i = 0;
+	
+		for (j=0; j < chord.frets.length; j++) {
+	
+			ctx.alignText = "left";
+			ctx.fillText(chord.frets.charAt(j), origin.x + (i * props.width / 5), origin.y + props.height + 12);
+	
+			if (chord.frets.charAt(j) == 0) {
+	
+	
+			} else if (chord.frets.charAt(j) == 'x' || chord.frets.charAt(j) == 'X') {
+	
+			} else {
+				ctx.beginPath();
+				ctx.arc(origin.x + (i * props.width / 5), origin.y - 7.5 + (15 * (chord.frets.charAt(j) - baseFret)), dotsize, 0, Math.PI*2,true);
+				ctx.closePath();
+				ctx.fill();
+			}
+			i++;
+		}
+	
+		// base fret indicator
+	
+		if (baseFret > 0) {
+			ctx.alignText = "left";
+			ctx.fillText(baseFret + 1, origin.x - 10, origin.y + 11);
+		} else {
+			ctx.alignText = "left";
+			ctx.fillText("3", origin.x - 10, origin.y + 41);
+		}
+	}
+};
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