Delphi - 移动重叠的T形 [英] Delphi - moving overlapping TShapes
问题描述
Thaks Uiii
根据我的评论,一个简单的样本重新设计。
<$ c $单位Unit4;
接口
使用
Windows,消息,SysUtils,变体,类,图形,控件,表单,
对话框;
const
NUM_TRIANGLES = 10;
COLORS:integer =(clRed,clGreen,clBlue,clYellow,clFuchsia,
clLime,clGray,clSilver,clBlack,clMaroon,clNavy,clSkyBlue,clMoneyGreen)的数组[0..12]
type
TTriangle = record
X,Y:integer; //左下角
Base,Height:integer;
颜色:TColor;
结束
TTriangles = TTriangle的数组[0..NUM_TRIANGLES - 1];
TForm4 = class(TForm)
procedure FormCreate(Sender:TObject);
procedure FormPaint(Sender:TObject);
procedure FormMouseDown(Sender:TObject; Button:TMouseButton;
Shift:TShiftState; X,Y:Integer);
procedure FormMouseMove(Sender:TObject; Shift:TShiftState; X,Y:Integer);
procedure FormMouseUp(Sender:TObject; Button:TMouseButton;
Shift:TShiftState; X,Y:Integer);
private
{私有声明}
FTriangles:TTriangles;
FDragOffset:TPoint;
FTriangleActive:boolean;
函数GetTriangleAt(AX,AY:Integer):整数;
函数IsMouseDown:boolean;
public
{公开声明}
end;
var
Form4:TForm4;
实现
使用数学;
{$ R * .dfm}
程序TForm4.FormCreate(发件人:TObject);
var
i:整数;
begin
FTriangleActive:= false;
随机化;
for i:= 0〜NUM_TRIANGLES - 1 do
with FTriangles [i] do
begin
base:= 40 + Random(80);
height:= 40 +随机(40);
X:= Random(ClientWidth - base);
Y:= height + Random(ClientHeight - height);
颜色:= RandomFrom(COLORS);
结束
结束
程序TForm4.FormMouseDown(Sender:TObject; Button:TMouseButton;
Shift:TShiftState; X,Y:Integer);
var
TriangleIndex:integer;
TempTriangle:TTriangle;
i:整数;
begin
TriangleIndex:= GetTriangleAt(X,Y);
如果TriangleIndex<> -1然后
begin
FDragOffset.X:= X - FTriangles [TriangleIndex] .X;
FDragOffset.Y:= Y - FTriangles [TriangleIndex] .Y;
TempTriangle:= FTriangles [TriangleIndex];
for i:= TriangleIndex to NUM_TRIANGLES - 2 do
FTriangles [i]:= FTriangles [i + 1];
FTriangles [NUM_TRIANGLES - 1]:= TempTriangle;
无效;
结束
FTriangleActive:= TriangleIndex<> -1;
结束
函数TForm4.IsMouseDown:boolean;
begin
result:= GetKeyState(VK_LBUTTON)和$ 8000< 0;
结束
procedure TForm4.FormMouseMove(Sender:TObject; Shift:TShiftState; X,
Y:Integer);
begin
如果IsMouseDown和FTriangleActive然后
begin
FTriangles [high(FTriangles)]。X:= X - FDragOffset.X;
FTriangles [高(FTriangles)]。Y:= Y - FDragOffset.Y;
无效;
结束
结束
procedure TForm4.FormMouseUp(Sender:TObject; Button:TMouseButton;
Shift:TShiftState; X,Y:Integer);
begin
FTriangleActive:= false;
结束
procedure TForm4.FormPaint(Sender:TObject);
var
i:整数;
顶点:TPoint数组;
begin
SetLength(Vertices,3);
for i:= 0 to NUM_TRIANGLES - 1 do
with FTriangles [i] do
begin
Canvas.Brush.Color:= Color;
顶点[0]:=点(X,Y);
顶点[1]:=点(X + Base,Y);
顶点[2]:=点(X + Base div 2,Y - Height);
Canvas.Polygon(Vertices);
结束
结束
函数TForm4.GetTriangleAt(AX,AY:Integer):整数;
var
i:整数;
begin
result:= -1;
for i:= NUM_TRIANGLES - 1 toto 0 do
with FTriangles [i] do
if InRange(AY,Y - Height,Y)and
InRange(AX,round( X +(Base / 2)*(Y-AY)/ Height),
round(X + Base - (Base / 2)*(Y-AY)/ Height))然后
Exit );
结束
结束。
不要忘记设置表单的 DoubleBuffered
到 true
。
编译示例演示: http://privat.rejbrand.se/MovingTriangles.exe
I've needed own triangle shape so, I inherited my triangle class form TShape and override paint method. Everything works fine, but I need to move this shapes with mouse. I set the method for every shape handling onMouseDown event. Moving work also fine. But If two shapes overlaps (shapes are in fact rectangles with some transparent areas), that the top's shape transparent area is over another shape, then the top shape moves instead of the shape below. It's correct, that is how delphi works. But it's not intuitive for the user. How can I achieve that? Is there possibility to not remove the event from event queue and sent it to underlying shapes, if yes it would be simple?
Thaks Uiii
A 'simple sample redesign' per my comment follows.
unit Unit4;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs;
const
NUM_TRIANGLES = 10;
COLORS: array[0..12] of integer = (clRed, clGreen, clBlue, clYellow, clFuchsia,
clLime, clGray, clSilver, clBlack, clMaroon, clNavy, clSkyBlue, clMoneyGreen);
type
TTriangle = record
X, Y: integer; // bottom-left corner
Base, Height: integer;
Color: TColor;
end;
TTriangles = array[0..NUM_TRIANGLES - 1] of TTriangle;
TForm4 = class(TForm)
procedure FormCreate(Sender: TObject);
procedure FormPaint(Sender: TObject);
procedure FormMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
procedure FormMouseMove(Sender: TObject; Shift: TShiftState; X, Y: Integer);
procedure FormMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
private
{ Private declarations }
FTriangles: TTriangles;
FDragOffset: TPoint;
FTriangleActive: boolean;
function GetTriangleAt(AX, AY: Integer): Integer;
function IsMouseDown: boolean;
public
{ Public declarations }
end;
var
Form4: TForm4;
implementation
uses Math;
{$R *.dfm}
procedure TForm4.FormCreate(Sender: TObject);
var
i: Integer;
begin
FTriangleActive := false;
Randomize;
for i := 0 to NUM_TRIANGLES - 1 do
with FTriangles[i] do
begin
base := 40 + Random(80);
height := 40 + Random(40);
X := Random(ClientWidth - base);
Y := height + Random(ClientHeight - height);
Color := RandomFrom(COLORS);
end;
end;
procedure TForm4.FormMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
var
TriangleIndex: integer;
TempTriangle: TTriangle;
i: Integer;
begin
TriangleIndex := GetTriangleAt(X, Y);
if TriangleIndex <> -1 then
begin
FDragOffset.X := X - FTriangles[TriangleIndex].X;
FDragOffset.Y := Y - FTriangles[TriangleIndex].Y;
TempTriangle := FTriangles[TriangleIndex];
for i := TriangleIndex to NUM_TRIANGLES - 2 do
FTriangles[i] := FTriangles[i + 1];
FTriangles[NUM_TRIANGLES - 1] := TempTriangle;
Invalidate;
end;
FTriangleActive := TriangleIndex <> -1;
end;
function TForm4.IsMouseDown: boolean;
begin
result := GetKeyState(VK_LBUTTON) and $8000 <> 0;
end;
procedure TForm4.FormMouseMove(Sender: TObject; Shift: TShiftState; X,
Y: Integer);
begin
if IsMouseDown and FTriangleActive then
begin
FTriangles[high(FTriangles)].X := X - FDragOffset.X;
FTriangles[high(FTriangles)].Y := Y - FDragOffset.Y;
Invalidate;
end;
end;
procedure TForm4.FormMouseUp(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
FTriangleActive := false;
end;
procedure TForm4.FormPaint(Sender: TObject);
var
i: Integer;
Vertices: array of TPoint;
begin
SetLength(Vertices, 3);
for i := 0 to NUM_TRIANGLES - 1 do
with FTriangles[i] do
begin
Canvas.Brush.Color := Color;
Vertices[0] := Point(X, Y);
Vertices[1] := Point(X + Base, Y);
Vertices[2] := Point(X + Base div 2, Y - Height);
Canvas.Polygon(Vertices);
end;
end;
function TForm4.GetTriangleAt(AX, AY: Integer): Integer;
var
i: Integer;
begin
result := -1;
for i := NUM_TRIANGLES - 1 downto 0 do
with FTriangles[i] do
if InRange(AY, Y - Height, Y) and
InRange(AX, round(X + (Base / 2) * (Y - AY) / Height),
round(X + Base - (Base / 2) * (Y - AY) / Height)) then
Exit(i);
end;
end.
Don't forget to set the form's DoubleBuffered
to true
.
Compiled sample demo: http://privat.rejbrand.se/MovingTriangles.exe
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