Работа с графикой в C++ Builder

Лекция №3

Основные понятия

Canvas (канва, холст) – область компонента, на которой можно рисовать или отображать готовые изображения

Canvas->Pixels[10][20] = clBlue;

10

20

Рисование линий

void __fastcall MoveTo(int X, int Y);void __fastcall LineTo(int X, int Y);

void __fastcall TForm1::FormPaint(TObject *Sender){

Canvas->MoveTo(20, 15);Canvas->LineTo(255, 82);

}

void __fastcall MoveTo(int X, int Y);void __fastcall LineTo(int X, int Y);

Рисование линий

void __fastcall TForm1::FormPaint(TObject *Sender){

Canvas->MoveTo(60, 20);Canvas->LineTo(60, 122);Canvas->LineTo(264, 122);Canvas->LineTo(60, 20);

}

Рисование полилинииvoid __fastcall Polyline(const Types::TPoint* Points, const int Points_Size);

void __fastcall TForm1::FormPaint(TObject *Sender){

TPoint Pt[] = { Point(60, 20), Point(60, 122) };Canvas->MoveTo(Pt[0].x, Pt[0].y);Canvas->LineTo(Pt[1].x, Pt[1].y);

}

void __fastcall TForm1::FormPaint(TObject *Sender){

TPoint Pt[7];Pt[0] = Point(20, 50);Pt[1] = Point(180, 50);Pt[2] = Point(180, 20);Pt[3] = Point(230, 70);Pt[4] = Point(180, 120);Pt[5] = Point(180, 90);Pt[6] = Point(20, 90);Canvas->Polyline(Pt, 7);

}

Рисование полилинии

void __fastcall TForm1::FormPaint(TObject *Sender){

TPoint Pt[7];Pt[0] = Point(20, 50);Pt[1] = Point(180, 50);Pt[2] = Point(180, 20);Pt[3] = Point(230, 70);Pt[4] = Point(180, 120);Pt[5] = Point(180, 90);Pt[6] = Point(20, 90);HDC hDC = Canvas->Handle;Canvas->MoveTo(20, 30);PolylineTo(hDC, Pt, 7);Canvas->LineTo(20, 110);

}

Рисование полилинииvoid __fastcall TForm1::FormPaint(TObject *Sender){

TPoint Pt[15];DWORD lpPts[] = { 4, 4, 7 };// Figure 1Pt[0] = Pt[3] = Point(50, 20);Pt[1] = Point(20, 60);Pt[2] = Point(80, 60);// Figure 2Pt[4] = Pt[7] = Point(70, 20);Pt[5] = Point(100, 60);Pt[6] = Point(130, 20);// Figure 3Pt[8] = Pt[14] = Point(145, 20);Pt[9] = Point(130, 40);Pt[10] = Point(145, 60);Pt[11] = Point(165, 60);Pt[12] = Point(180, 40);Pt[13] = Point(165, 20);HDC hDC = Canvas->Handle;PolyPolyline(hDC, Pt, lpPts, 3);

}

Рисование полигонаvoid __fastcall TForm1::FormPaint(TObject *Sender){

TPoint Pt[7];Pt[0] = Point(20, 50);Pt[1] = Point(180, 50);Pt[2] = Point(180, 20);Pt[3] = Point(230, 70);Pt[4] = Point(180, 120);Pt[5] = Point(180, 90);Pt[6] = Point(20, 90);Canvas->Polygon(Pt, 7);

}

Рисование полигонаvoid __fastcall TForm1::FormPaint(TObject *Sender) {

TPoint Pt[12];int lpPts[] = { 3, 3, 3, 3 };// Top TrianglePt[0] = Point(125, 10);Pt[1] = Point( 95, 70);Pt[2] = Point(155, 70);// Left TrianglePt[3] = Point( 80, 80);Pt[4] = Point( 20, 110);Pt[5] = Point( 80, 140);// Bottom TrianglePt[6] = Point( 95, 155);Pt[7] = Point(125, 215);Pt[8] = Point(155, 155);// Right TrianglePt[9] = Point(170, 80);Pt[10] = Point(170, 140);Pt[11] = Point(230, 110);HDC hDC = Canvas->Handle;PolyPolygon(hDC, Pt, lpPts, 4);

}

Рисование прямоугольников

void __fastcall Rectangle(int X1, int Y1, int X2, int Y2); Canvas->Rectangle(20, 20, 226, 144);

void __fastcall TForm1::FormPaint(TObject *Sender) {

RECT Recto;Recto.left = 328;Recto.top = 125;Recto.right = 48;Recto.bottom = 25;Canvas->Rectangle(Recto);

}

Рисование окружностей

void __fastcall Ellipse(int X1, int Y1, int X2, int Y2); Canvas->Ellipse(20, 20, 226, 144);

void __fastcall TForm1::FormPaint(TObject *Sender){

TRect Recto(328, 125, 28, 8); Canvas->Ellipse(Recto);

}

Характеристики линий

void __fastcall TForm1::FormPaint(TObject *Sender){

Canvas->Pen->Color = clRed;Canvas->MoveTo(20, 15);Canvas->LineTo(255, 82);

}

Характеристики линий

void __fastcall TForm1::FormPaint(TObject *Sender){

Canvas->Pen->Style = psDashDotDot;Canvas->Pen->Width = 1;Canvas->Pen->Color = TColor(RGB(255, 25, 5));Canvas->Rectangle(20, 22, 250, 125);

}

Характеристики кистиvoid __fastcall TForm1::FormPaint(TObject *Sender){

Canvas->Brush->Color = static_cast<TColor>(RGB(255, 2, 5));TPoint Pt[3];// Top TrianglePt[0] = Point(125, 10);Pt[1] = Point( 95, 70);Pt[2] = Point(155, 70);Canvas->Brush->Color = clGreen;Canvas->Polygon(Pt, 2);// Left Triangle Pt[0] = Point( 80, 80);Pt[1] = Point( 20, 110);Pt[2] = Point( 80, 140);Canvas->Brush->Color = clRed;Canvas->Polygon(Pt, 2);// Bottom Triangle Pt[0] = Point( 95, 155);Pt[1] = Point(125, 215);Pt[2] = Point(155, 155);Canvas->Brush->Color = clYellow;Canvas->Polygon(Pt, 2);// Right Triangle Pt[0] = Point(170, 80);Pt[1] = Point(170, 140);Pt[2] = Point(230, 110);Canvas->Brush->Color = clBlue;Canvas->Polygon(Pt, 2);

}

Характеристики кисти

void __fastcall TForm1::FormPaint(TObject *Sender){

LOGBRUSH LogBrush;LogBrush.lbStyle = BS_HATCHED;LogBrush.lbColor = RGB(255, 0, 255);LogBrush.lbHatch = HS_DIAGCROSS;HBRUSH NewBrush = CreateBrushIndirect(&LogBrush);Canvas->Brush->Handle = NewBrush;Canvas->Rectangle(20, 12, 250, 175);

}