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Bug 913

Summary:	Draw chart with transparency
Product:	VCL TeeChart	Reporter:	yeray alonso <yeray>
Component:	Canvas	Assignee:	Steema Issue Manager <issuemanager>
Status:	IN_PROGRESS ---
Severity:	enhancement	CC:	david
Priority:	Normal
Version:	140512
Target Milestone:	---
Hardware:	PC
OS:	Windows
Chart Series:	---	Delphi / C++ Builder RAD IDE Version:

Description yeray alonso 2014-09-08 09:02:02 EDT

PNG format supports true transparency, by specifying an alpha channel, as does the GDI+ bitmap.
Implement a way of specifying a transparency level for the tchart panel, which would be rendered properly to a format that supports transparency.

Comment 1 david berneda 2014-09-17 05:16:41 EDT

This is now possible, setting the Chart1.Color to either "clNone" or:

Chart1.Color := Chart1.Canvas.ColorFrom(0,255);  // 255 = full transparent

or equivalent:

Chart1.Color := $FF000000;

Note: 
Its usually nicer a transparent chart with Chart1.BevelOuter := bvNone.
Also Chart1.Gradient.Visible:=False, otherwise the gradient will cover the whole chart and it will not be transparent.

Note: 
VCL only, for versions prior to Delphi 2009, the project must be rebuilt using the special define "PNGIMAGE".