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Quick-tip 103 | Applying a transparent color to quick-tip 102

qt103-2

Quick-tip 102 explained how to draw a rectangle on a chart based on a recent pivot. The color of the rectangle was changed according to whether the current close is above or below the high of the rectangle.

Quick-tip 103 uses quick-tip 102 to demonstrate how to make a color transparent.

In the original program the rectangles are colored as follows:

IF C > BodyLow Then Rect1.Color = Color.Green;
IF C > BodyLow Then Rect1.FillColor = Color.DarkGreen;
IF C < BodyLow Then Rect1.Color = Color.Red;
IF C < BodyLow Then Rect1.FillColor = Color.DarkRed;

 

qt102-1

In order to make one of the colors partially translucent, we could use the following syntax:

IF C > BodyLow Then Rect1.Color = Color.Green;
IF C > BodyLow Then Rect1.FillColor = Color.FromArgb( Rectangle_Transparency, Color.FromName( "DarkGreen" ) ) ; // Fill color
IF C < BodyLow Then Rect1.Color = Color.Red;
IF C < BodyLow Then Rect1.FillColor = Color.DarkRed;

Where Rectangle_Transparency is an input representing the alpha value of the first rectangle (between 0 and 255).

QT103

In the above image, the alpha value was set to 50.

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