Lecture 10. Drawing figures C# презентация

Drawing figures

Drawing of ellipses Drawing of ellipses DrawEllipse(pen, int x1, int y1, int Height, int Width); g.DrawEllipse(pen2, 40, 40, 210,150); It's possible to use RectangleF class object. There are four float type numbers. They denoted an disposition and size of rectangle: coordinates of left upper corner and right bottom corner, height and width of rectangle that is used for placing ellipse. Recall that RectangleF defines a rectangle float. RectangleF rect1=new RectangleF(10,10,70,110); g. DrawEllipse(pen1, rect1);

Drawing line Drawing line DrawLine(pen, int x1, int y1, int x2, int y2); x1,y1,x2,y2- coordinates of start and of finish of line. g.DrawLine(pen,100,100,200,200); You may use Point class objects. Point – integer type; PointF- real type (float); Example: Point p1, p2;             p1=new Point(300,50);             p2=new Point(400,200);             g.DrawLine(pen1, p1, p2);

Drawing of curves Drawing of curves Bezier curve. This is smooth curve that is placed close to four preset points. DrawBezier(pen, p1,p2,p3,p4); Example: double[ ] q=new double[100];           Point[ ] w=new Point [100];             for(int i=0;i<f2.Length;i++)             {    q[i]=100*Math.Exp(-i*0.1);                 w[i].X=200+ (int) (i*2.5);                 w[i].Y=150+ (int) q[i];             } g.DrawBezier(pen,w[10],w[41],w[72],w[93]);

2) DrawCurve(pen, array_of_points);- the smooth curve that passes through points array. 2) DrawCurve(pen, array_of_points);- the smooth curve that passes through points array. Example: PointF [ ] f= new PointF[6];             f[0].X=10;f[0].Y=100;             f[1].X=50; f[1].Y=150;             f[2].X=100;f[2].Y=240;             f[3].X=150; f[3].Y=130;             f[4].X=200;f[4].Y=50;             f[5].X=300; f[5].Y=10; g.DrawCurve(pen, f );

3) DrawClosedCurve(pen, array_of_points);-closed smooth curve that passes through points array. 3) DrawClosedCurve(pen, array_of_points);-closed smooth curve that passes through points array. Example, g.DrawClosedCurve(pen, f ); 4) DrawPoligon(pen, array_of_points);-creates a polygon by linking the points by direct lines. Point [ ] p= new Point[3]; p[0].X=110; p[0].Y=110; p[1].X=230; p[1].Y=130; p[2].X=290; p[2].Y=190; g.DrawPolygon(pen2, p );

Drawing of Arc Drawing of Arc 5) DrawArc(pen, int x, int y, int Height, int Width, int Start_Angle, int End_Angle);- the arc is a part of ellipse that is placed in rectangle with preset Height and Width. Start_Angle, End_Angle- these are start angle and finish angle in degree; g.DrawArc(pen, 200, 200, 100, 100, 10, 160); 6) Pie. It differs from an arc because in this case arc's ends are connected with center by radiuses. DrawPie(pen, rect, StartAngle, EndAngle); rect - this is an object of Rectangle or RectangleF classes. It's possible merely to preset the coordinates, height and width of rectangle. g.DrawPie(pen2,100,100,350,350,0,280);

Do next task: Do next task: Create a C# program: draw a rectangle. Draw an ellipse inside of rectangle. In the ellipse draw an arc. Besides of must be drawn the second rectangle and any text must be placed inside that.