指定座標のRGB値取得(�T)          <TOP>

GradientFill 矩形、または三角形の内部をグラデーションで塗りつぶす

GetPixel 指定された座標のピクセルのRGB(赤、緑、青)値を取得

マウスでクリックした座標のＲＧＢ値を取得します。F-BasicでのGetPixel(x, y)と同じです。

'================================================================
'= 指定座標のRGB値取得
'=    (GetPixel.bas)
'================================================================
#include "Windows.bi"

Type GRADIENT_TRIANGLE
    Vertex1 As Long
    Vertex2 As Long
    Vertex3 As Long
End Type

Type TRIVERTEX
    X As Long
    Y As Long
    Red As Integer
    Green As Integer
    Blue As Integer
    Alpha As Integer
End Type

Type GRADIENT_RECT
    UpperLeft As Long
    LowerRight As Long
End Type

' 矩形、または三角形の内部をグラデーションで塗りつぶす
Declare Function Api_GradientFill& Lib "msimg32" Alias "GradientFill" (ByVal hDC&, pVertex As TRIVERTEX, ByVal dwNumVertex&, pMesh As GRADIENT_TRIANGLE, ByVal dwNumMesh&, ByVal dwMode&)

' 指定された座標のピクセルのRGB値を取得
Declare Function Api_GetPixel& Lib "gdi32" Alias "GetPixel" (ByVal hDC&, ByVal X&, ByVal Y&)

' 指定されたウィンドウのクライアント領域または画面全体を表すディスプレイデバイスコンテキストのハンドルを取得
Declare Function Api_GetDC& Lib "user32" Alias "GetDC" (ByVal hWnd&)

' デバイスコンテキストを解放
Declare Function Api_ReleaseDC& Lib "user32" Alias "ReleaseDC" (ByVal hWnd&, ByVal hDC&)

#define GRADIENT_FILL_RECT_H &H0        '
#define GRADIENT_FILL_RECT_V &H1        '
#define GRADIENT_FILL_TRIANGLE &H2      '

Var Shared hDC As Long

'================================================================
'=
'================================================================
Declare Sub MainForm_Start edecl ()
Sub MainForm_Start()
    Var vert(4) As TRIVERTEX
    Var gTRi(1) As GRADIENT_TRIANGLE
    Var Ret As Long

    hDC = Api_GetDC(GethWnd)

    vert(0).X = 0
    vert(0).Y = 0
    vert(0).Red = -256
    vert(0).Green = 0
    vert(0).Blue = 0
    vert(0).Alpha = 0
   
    vert(1).X = 255
    vert(1).Y = 0
    vert(1).Red = 0
    vert(1).Green = -256
    vert(1).Blue = 0
    vert(1).Alpha = 0
   
    vert(2).X = 256
    vert(2).Y = 256
    vert(2).Red = 0
    vert(2).Green = 0
    vert(2).Blue = -256
    vert(2).Alpha = 0
   
    vert(3).X = 0
    vert(3).Y = 256
    vert(3).Red = -256
    vert(3).Green = -256
    vert(3).Blue = -256
    vert(3).Alpha = 0
   
    gTRi(0).Vertex1 = 0
    gTRi(0).Vertex2 = 1
    gTRi(0).Vertex3 = 2
   
    gTRi(1).Vertex1 = 0
    gTRi(1).Vertex2 = 2
    gTRi(1).Vertex3 = 3

    Ret = Api_GradientFill(hDC, vert(0), 4, gTRi(0), 2, GRADIENT_FILL_TRIANGLE)
End Sub

'================================================================
'=
'================================================================
Declare Sub MainForm_MouseMove edecl (ByVal Button%, ByVal Shift%, ByVal X!, ByVal Y!)
Sub MainForm_MouseMove(ByVal Button%, ByVal Shift%, ByVal X!, ByVal Y!)
    Var DotColor As String
    Var ColorMe As Long
    Var rgbRed As Integer
    Var rgbGreen As Integer
    Var rgbBlue As Integer

    ColorMe = Api_GetPixel(hDC, X, Y)
'   ColorMe = GetPixel(X, Y)

    rgbRed = Abs(ColorMe Mod &H100)
    ColorMe = Abs(ColorMe \ &H100)
    rgbGreen = Abs(ColorMe Mod &H100)
    ColorMe = Abs(ColorMe \ &H100)
    rgbBlue = Abs(ColorMe Mod &H100)
    ColorMe = RGB(rgbRed, rgbGreen, rgbBlue)

    DotColor = "GetPixel:RGB(" & Format$(rgbRed, "###") & ", " & Format$(rgbGreen, "###") & ", " & Format$(rgbBlue, "###") & ")"
    SetWindowText DotColor
End Sub

'================================================================
'=
'================================================================
While 1
    WaitEvent
Wend
Stop
End