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{
*****************************************************************************
See the file COPYING.modifiedLGPL.txt, included in this distribution,
for details about the license.
*****************************************************************************
Authors: Alexander Klenin
}
unit TABGRAUtils;
interface
{$H+}
uses
BGRABitmap, BGRABitmapTypes, BGRAGradients, Graphics, Types,
TASeries;
function CreateChocolateBar(
AColor: TBGRAPixel; ALightPos: TPoint; ARect: TRect; ABorder: Integer;
ARoundedCorners: Boolean; AOptions: TRectangleMapOptions): TBGRABitmap;
procedure DrawChocolateBar(
ASeries: TBarSeries; ACanvas: TCanvas; ARect: TRect; APointIndex: Integer;
ARounded: boolean);
function CreatePhong3DBar(
AColor: TBGRAPixel; ALightPos: TPoint; var ARect: TRect;
ADepth: Integer): TBGRABitmap;
procedure DrawPhong3DBar(
ASeries: TBarSeries; ACanvas: TCanvas; ARect: TRect; APointIndex: Integer);
implementation
uses
TAChartUtils, TADrawUtils, TAGeometry;
function BarColor(ASeries: TBarSeries; APointIndex: Integer): TBGRAPixel;
begin
with ASeries do
Result := ColorToBGRA(ColorToRGB(
ColorDef(Source[APointIndex]^.Color, BarBrush.Color)), 255 - Transparency);
end;
function CreateChocolateBar(
AColor: TBGRAPixel; ALightPos: TPoint; ARect: TRect; ABorder: Integer;
ARoundedCorners: Boolean; AOptions: TRectangleMapOptions): TBGRABitmap;
var
phong: TPhongShading;
t: TPoint;
begin
t := MaxPoint(ARect.BottomRight - ARect.TopLeft, Point(0, 0));
Result := TBGRABitmap.Create(t.X, t.Y);
if (t.X = 0) and (t.Y = 0) then exit;
if ABorder < 0 then ABorder := 0;
phong := TPhongShading.Create;
try
phong.AmbientFactor := 0.5;
phong.LightPosition := ALightPos - ARect.TopLeft;
phong.DrawRectangle(
Result, BoundsSize(0, 0, t), ABorder, ABorder,
AColor, ARoundedCorners, AOptions);
finally
phong.Free;
end;
end;
procedure DrawChocolateBar(
ASeries: TBarSeries; ACanvas: TCanvas; ARect: TRect;
APointIndex: Integer; ARounded: boolean);
var
bar: TBGRABitmap;
border: Integer;
begin
border := (ARect.Right - ARect.Left) div 8;
ARect.Top += -border div 2 + 1;
ARect.Bottom += border div 2 + 1;
bar := CreateChocolateBar(
BarColor(ASeries, APointIndex),
Point(ASeries.ParentChart.ClientWidth div 2, 0),
ARect, border, ARounded, []);
try
with ARect.TopLeft do
bar.Draw(ACanvas, X, Y, false);
finally
bar.Free;
end;
end;
function CreatePhong3DBar(
AColor: TBGRAPixel; ALightPos: TPoint; var ARect: TRect;
ADepth: Integer): TBGRABitmap;
var
phong: TPhongShading;
i: Integer;
map: TBGRABitmap;
h: TBGRAPixel;
t: TPoint;
begin
t := MaxPoint(ARect.BottomRight - ARect.TopLeft, Point(0, 0));
map := TBGRABitmap.Create(t.X + ADepth,t.Y + ADepth);
try
map.FillRect(0, ADepth, t.X, t.Y + ADepth, BGRAWhite, dmSet);
for i := 1 to ADepth do begin
h := MapHeightToBGRA((ADepth - i) / ADepth, 255);
map.SetHorizLine(i, ADepth - i, t.X - 1 + i - 1, h);
map.SetVertLine(t.X - 1 + i, ADepth - i, t.Y + ADepth - 1 - i, h);
end;
Result := TBGRABitmap.Create(t.X + ADepth, t.Y + ADepth);
ARect.Top -= ADepth;
ARect.Right += ADepth;
if (Result.width = 0) or (Result.Height = 0) then exit;
phong := TPhongShading.Create;
try
phong.AmbientFactor := 0.5;
phong.LightPosition := ALightPos - ARect.TopLeft;
phong.Draw(Result, map, ADepth, 0, 0, AColor);
finally
phong.Free;
end;
finally
map.Free;
end;
end;
procedure DrawPhong3DBar(
ASeries: TBarSeries; ACanvas: TCanvas; ARect: TRect; APointIndex: Integer);
procedure DrawContour(var ABar: TBGRABitmap; var ADrawnRect: TRect);
var
size: TPoint;
temp: TBGRABitmap;
marginValue, depth: integer;
margin: TPoint;
begin
margin := point(0, 0);
if ASeries.BarPen.Style = psClear then exit;
size := ARect.BottomRight - ARect.TopLeft;
if ASeries.BarPen.Width > 1 then begin
marginValue := (ASeries.BarPen.Width + 1) div 2;
margin := Point(marginValue, marginValue);
temp := TBGRABitmap.Create(
ABar.Width + 2 * margin.X, ABar.Height + 2 * margin.Y);
temp.PutImage(margin.X, margin.Y, ABar, dmSet);
BGRAReplace(ABar, temp);
ADrawnRect.TopLeft -= margin;
ADrawnRect.BottomRight += margin;
end;
depth := ASeries.Depth;
with ABar.CanvasBGRA do begin
Pen.Assign(ASeries.BarPen);
Brush.Style := bsClear;
Polygon([
Point(margin.x + 0, margin.y + depth),
Point(margin.x + depth, margin.y + 0),
Point(margin.x + size.x - 1 + depth, margin.y + 0),
Point(margin.x + size.x - 1 + depth, margin.y + size.y - 1),
Point(margin.x + size.x - 1, margin.y + size.y - 1 + depth),
Point(margin.x + 0, margin.y + size.y - 1 + depth)
]);
end;
end;
var
bar: TBGRABitmap;
begin
bar := CreatePhong3DBar(
BarColor(ASeries, APointIndex),
Point(ASeries.ParentChart.ClientWidth div 2, 0), ARect, ASeries.Depth);
try
DrawContour(bar, ARect);
with ARect.TopLeft do
bar.Draw(ACanvas, X, Y, false);
finally
bar.Free;
end;
end;
end.
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