1. Работа с графикой в C++ Builder
Лекция №3
Работа с графикой в C++ Builder

2. Основные понятия
Canvas (канва, холст) – область компонента, на которой можно рисовать или отображать готовые изображения 10 20
Canvas->Pixels[10][20] = clBlue;

3. Рисование линий void __fastcall MoveTo(int X, int Y);
void __fastcall LineTo(int X, int Y);
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); }

4. Рисование линий void __fastcall TForm1::FormPaint(TObject *Sender) {
Canvas->MoveTo(60, 20);
Canvas->LineTo(60, 122);
Canvas->LineTo(264, 122);
Canvas->LineTo(60, 20); }

5. Рисование полилинии
void __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); }

6. 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); }

7. Рисование полилинии void __fastcall TForm1::FormPaint(TObject *Sender){
TPoint Pt[15];
DWORD lpPts[] = { 4, 4, 7 };
// Figure 1
Pt[0] = Pt[3] = Point(50, 20);
Pt[1] = Point(20, 60);
Pt[2] = Point(80, 60);
// Figure 2
Pt[4] = Pt[7] = Point(70, 20);
Pt[5] = Point(100, 60);
Pt[6] = Point(130, 20);
// Figure 3
Pt[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); }

8. Рисование полигона 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->Polygon(Pt, 7); }

9. Рисование полигона
void __fastcall TForm1::FormPaint(TObject *Sender) {
TPoint Pt[12];
int lpPts[] = { 3, 3, 3, 3 };
// Top Triangle
Pt[0] = Point(125, 10);
Pt[1] = Point( 95, 70);
Pt[2] = Point(155, 70);
// Left Triangle
Pt[3] = Point( 80, 80);
Pt[4] = Point( 20, 110);
Pt[5] = Point( 80, 140);
// Bottom Triangle
Pt[6] = Point( 95, 155);
Pt[7] = Point(125, 215);
Pt[8] = Point(155, 155);
// Right Triangle
Pt[9] = Point(170, 80);
Pt[10] = Point(170, 140);
Pt[11] = Point(230, 110);
HDC hDC = Canvas->Handle;
PolyPolygon(hDC, Pt, lpPts, 4); }

10. 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); }

11. 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); }

12. Характеристики линий
void __fastcall TForm1::FormPaint(TObject *Sender) {
Canvas->Pen->Color = clRed;
Canvas->MoveTo(20, 15);
Canvas->LineTo(255, 82); }

13. 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); }

14. Характеристики кисти
void __fastcall TForm1::FormPaint(TObject *Sender) {
Canvas->Brush->Color = static_cast<TColor>(RGB(255, 2, 5));
TPoint Pt[3];
// Top Triangle
Pt[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;
// Bottom Triangle Pt[0] = Point( 95, 155);
Pt[1] = Point(125, 215);
Pt[2] = Point(155, 155);
Canvas->Brush->Color = clYellow;
// Right Triangle Pt[0] = Point(170, 80);
Pt[1] = Point(170, 140);
Pt[2] = Point(230, 110);
Canvas->Brush->Color = clBlue; }

15. 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); }