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ViewportPanel - ViewportPanel.java Authors Lewis and Loftus...

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//******************************************************************** // ViewportPanel.java Authors: Lewis and Loftus // // Solution to Programming Project 9.9 // // Used by EquationFrame to draws the graph of the equation ax^2 + bx + c. //******************************************************************** import java.awt.*; import javax.swing.JPanel; import javax.swing.border.LineBorder; i public class ViewportPanel extends JPanel { final int X_MIN = -10; final int Y_MIN = -10; final int X_MAX = 10; final int Y_MAX = 10; final int REAL_WORLD_WIDTH = X_MAX - X_MIN; final int REAL_WORLD_HEIGHT = Y_MAX - Y_MIN; final float TICK_LENGTH = 0.2f; Equation2 equation; public ViewportPanel() { equation = new Equation2(); setBorder(new LineBorder(Color.black, 4)); } //----------------------------------------------------------------- // sets the equation coefficients //----------------------------------------------------------------- void setEquation(Equation2 newEquation) { equation = newEquation; } public Dimension getPreferredSize() { return new Dimension(500, 500); } //----------------------------------------------------------------- // utitlity method used to convert world X coordinate to screen X coordinate //----------------------------------------------------------------- int convertX(float x) { float offset = x - X_MIN; float result = offset * getSize().width / REAL_WORLD_WIDTH; return (int)Math.round(result); } //----------------------------------------------------------------- // utitlity method used to convert world Y coordinate to screen Y coordinate //----------------------------------------------------------------- int convertY(float y) {
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