var scale = new GcSpread.Sheets.ThreeScaleRule();
scale.setMidpointColor("red");
scale.setMidpointType(0);
scale.setMidpointValue(50);
scale.setMaximumColor("blue");
scale.setMaximumType(2);
scale.setMaximumValue(100);
scale.setMinimumColor("yellow");
scale.setMinimumType(1);
scale.setMinimumValue(10);
scale.ranges = [new GcSpread.Sheets.Range(0, 0, 10, 3)];
activeSheet.getConditionalFormats().addRule(scale);
activeSheet.setValue(0,0, 1,3);
activeSheet.setValue(1,0, 50,3);
activeSheet.setValue(2,0, 100,3);
alert("Color: " + scale.getMinimumColor() + " Type: " + scale.getMinimumType() + " Value: " + scale.getMinimumValue());