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Grafik – Crayon-objekter

Grafik – Crayon-objekter. Model. (0,0). Position : (x,y) Vinkel : v Farve : color Bredde: positivt tal. 270. Tavle. 0 (360). 180. 90. (400,500). En pens tilstand : - (position, vinkel, farve, bredde) - starttilstand: ((0, 0), 0, Color.black, 1).

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Grafik – Crayon-objekter

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  1. Grafik – Crayon-objekter IntroJava2006 - AAU

  2. Model (0,0) • Position: (x,y) • Vinkel: v • Farve: color • Bredde: positivt tal 270 Tavle 0 (360) 180 90 (400,500) ... En pens tilstand: - (position, vinkel, farve, bredde) - starttilstand: ((0, 0), 0, Color.black, 1) Eller ((midt, midt), 0, Color.black, down) IntroJava2006 - AAU

  3. Metoder • public void move(double d) Flyt d enheder i aktuel tegneretning, mens der tegnes • public void moveto(double x, double y)Flyt til position (x,y), mens der tegnes • public void jump(double d)Flyt d enheder i aktuel tegneretning uden at tegne • public void jumpto(double x, double y)Flyt til (x,y) uden at tegne • public void turn(double a)Drej a grader med uret • public void turnto(double a) Drej til tegneretning a (x-aksens retning er 0 grader) • public void erase()Slet alt på tavlen IntroJava2006 - AAU

  4. I BlueJ Skal bruges – ikke ændres Skal kodes IntroJava2006 - AAU

  5. Eksempel import java.awt.*; public class CrayonSquares { public void main() { Crayon blue_pencil = new Crayon(Color.BLUE, 1); Crayon red_pencil = new Crayon(Color.RED, 1); //tegn det blå kvadrat: blue_pencil.jumpto(100, 100); blue_pencil.turnto(0); blue_pencil.move(100); blue_pencil.turn(90); blue_pencil.move(100); blue_pencil.turn(90); blue_pencil.move(100); blue_pencil.turn(90); blue_pencil.move(100); blue_pencil.turn(90); //Tegn det røde kvadrat: IntroJava2006 - AAU

  6. Øvelser • Hent projektet opgCrayon. Åben det og kør det. • Tegn et grønt kvadrat uden om de to andre. • Tegn en ligesidet trekant inden i en ligesidet sekskant. • Eksperimenter med Crayon-objekter og lav nogle ”kunstneriske” tegninger. IntroJava2006 - AAU

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