Delphi完成圖像文本旋轉特效完好實例代碼。本站提示廣大學習愛好者：（Delphi完成圖像文本旋轉特效完好實例代碼）文章只能為提供參考，不一定能成為您想要的結果。以下是Delphi完成圖像文本旋轉特效完好實例代碼正文
本文以實例講述了Delphi完成圖像文本旋轉特效的處理辦法，在本順序中應用的控件次要是Panel 控件、Image 控件、Edit 控件、Label 控件和Button 控件。本順序的關鍵是應用Delphi 的bmp_rotate()函數來完成旋轉圖像的功用。並巧妙地調用相關Windows API 函數來完成對文本的旋轉特效。
完好的實例代碼如下：
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,math,
StdCtrls, ExtCtrls;
type
TForm1 = class(TForm)
Edit1: TEdit;
Image1: TImage;
bmprotate: TButton;
Label1: TLabel;
Panel1: TPanel;
Image2: TImage;
Panel2: TPanel;
Image3: TImage;
Edit2: TEdit;
RotatedText: TButton;
Label2: TLabel;
procedure bmprotateClick(Sender: TObject);
procedure RotatedTextClick(Sender: TObject);
procedure FormCreate(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
procedure bmp_rotate(src,dst:Tbitmap;angle:extended);
Procedure DrawRotatedText(TheCanvas : TCanvas; TheAngle : Integer;
TheText : String);
end;
var
Form1: TForm1;
implementation
{$R *.DFM}
procedure TForm1.bmp_rotate(src,dst:Tbitmap;angle:extended);//圖像旋轉
var
c1x,c1y,c2x,c2y:integer;
p1x,p1y,p2x,p2y:integer;
radius,n:integer;
alpha:extended;
c0,c1,c2,c3:tcolor;
begin
angle := (angle / 180) * pi; //將文本框內的內容轉換角度
c1x := src.Width div 2;
c1y := src.Height div 2;
c2x := dst.Width div 2;
c2y := dst.Height div 2;
if c2x < c2y then
n := c2y
else
n := c2x;
dec (n,1); //使n 值增加1,n:=n-1
for p2x := 0 to n do begin
for p2y := 0 to n do begin
if p2x = 0 then
alpha:= pi/2
else
alpha := arctan2(p2y,p2x);
radius := round(sqrt((p2x*p2x)+(p2y*p2y)));//設置旋轉時的半徑大小
p1x := round(radius * cos(angle+alpha)); //設置旋轉時的圓心橫坐標
p1y := round(radius * sin(angle+alpha)); //設置旋轉時的圓心縱坐標
c0 := src.Canvas.pixels[c1x+p1x,c1y+p1y];//交換圖像相關坐標處的像素
c1 := src.Canvas.pixels[c1x-p1x,c1y-p1y];
c2 := src.Canvas.pixels[c1x+p1y,c1y-p1x];
c3 := src.Canvas.pixels[c1x-p1y,c1y+p1x];
dst.Canvas.pixels[c2x+p2x,c2y+p2y]:=c0; //置換不同地位的像素點
dst.Canvas.pixels[c2x-p2x,c2y-p2y]:=c1;
dst.Canvas.pixels[c2x+p2y,c2y-p2x]:=c2;
dst.Canvas.pixels[c2x-p2y,c2y+p2x]:=c3;
end;
application.processmessages //呼應其他的音訊懇求
end;
end;
procedure TForm1.bmprotateClick(Sender: TObject);
Var
RAngle : Extended;
begin
RAngle := StrToFloat(Edit1.Text); //設置旋轉的角度
bmp_rotate(Image1.Picture.bitmap,Image2.Picture.bitmap, RAngle);//運轉旋轉函數，旋轉圖形
end;
Procedure TForm1.DrawRotatedText(TheCanvas : TCanvas; TheAngle : Integer;
TheText : String);
var
lf : TLogFont;
tf : TFont;
begin
Image3.Canvas.refresh;
with TheCanvas do begin
Font.Name:='Arial';
Font.Size:=18;
Brush.Style:= bsClear;
tf:= TFont.Create;
try
tf.Assign(Font);
GetObject(tf.Handle, Sizeof(lf), @lf); //將以後實例句柄賦給tf 這個Font 對象
lf.lfEscapement:=TheAngle*10;
lf.lfOrientation := TheAngle * 10; //使輸出時的橫坐標線與程度線呈所指定的角度
tf.Handle := CreateFontIndirect(lf); //創立一個Font 詳細對象
Font.Assign(tf); //使這個對象運用到順序中
finally
tf.Free; //釋放對象
end;
TextOut(Image3.left, Image3.top+20 , TheText); //繪制文本到指定區域
end;
end;
procedure TForm1.RotatedTextClick(Sender: TObject);
Var
TheAngle : Integer;
begin
TheAngle := StrToInt(Edit2.Text); //將文本框中的文本轉換角度
DrawRotatedText(Image3.Canvas, TheAngle, 'Delphi圖形任務室'); //調用旋轉文本函數
end;
procedure TForm1.FormCreate(Sender: TObject);
var
tf : TFont;
theText:string;
begin
theText:='Delphi圖形任務室'; //設置文本
with Image3.Canvas do
begin
Font.Name := 'Arial'; //設置字體
Font.Size := 18; //設置字體大小
Brush.Style := bsClear; //設置筆刷款式
tf:= TFont.Create; //創立一個Font 詳細對象
TextOut(Image3.left, Image3.top+20 , TheText); //繪制文本到指定區域
end;
end;
end.
