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‎Arrow.java‎

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import java.awt.*;
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import java.awt.geom.Point2D;
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public class Arrow
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{
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double angle;
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double coordX;
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double coordY;
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double screenX;
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double screenY;
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double length = 3;
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Color color;
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double magnitude;
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double maxCX;
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double maxCY;
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double maxSX;
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double maxSY;
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double curl;
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double divergence;
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Panel panel;
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double DPDX;
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double DPDY;
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double DPDT;
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double DQDX;
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double DQDY;
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double DQDT;
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public Arrow(double initX, double initY, Panel panelInit)
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{
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panel = panelInit;
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coordX = initX;
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coordY = initY;
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maxSX = panel.window_screenX;
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maxSY = panel.window_screenY;
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maxCX = panel.window_maxCoordX;
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maxCY = panel.window_maxCoordY;
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screenX = coordsToScreenX(coordX);
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screenY = coordsToScreenY(coordY);
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Point2D tempPoint = panel.getVector(coordX, coordY);
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magnitude = tempPoint.getX();
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angle = tempPoint.getY();
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Point2D arrowDX = panel.getVector(coordX + 0.001, coordY);
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Point2D arrowDY = panel.getVector(coordX, coordY + 0.001);
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DPDX = (arrowDX.getX()*Math.cos(arrowDX.getY()) - magnitude*Math.cos(angle))/0.001;//dP/dx
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//System.out.println(arrowDX.toString() + " " + DPDX + " " + arrowInit.toString());
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DPDY = (arrowDY.getX()*Math.cos(arrowDY.getY()) - magnitude*Math.cos(angle))/0.001;//dP/dy
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DQDX = (arrowDX.getX()*Math.sin(arrowDX.getY()) - magnitude*Math.sin(angle))/0.001;//dQ/dx
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DQDY = (arrowDY.getX()*Math.sin(arrowDY.getY()) - magnitude*Math.sin(angle))/0.001;
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curl = DQDX - DPDY;
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divergence = DQDY + DPDX;
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}
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public void update(Graphics g, Panel panel)
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{
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maxCX = panel.window_maxCoordX;
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maxCY = panel.window_maxCoordY;
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coordX = screenToCoordsX(screenX);
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coordY = screenToCoordsY(screenY);
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Point2D tempPoint = panel.getVector(coordX, coordY);
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magnitude = tempPoint.getX();
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curl = panel.getCurl(coordX, coordY);
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angle = tempPoint.getY();
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panel.vector_to_rgb(this);
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int endX = (int)(screenX + 2*length*Math.cos(angle));
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int endY = (int)(screenY + 2*length*Math.sin(angle));
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/*int leftX = endX - (int)(length*Math.sin(angle));
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int leftY = endY + (int)(length*Math.cos(angle));
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int rightX = endX + (int)(length*Math.sin(angle));
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int rightY = endY - (int)(length*Math.cos(angle));
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int topX = endX + (int)(length*Math.cos(angle));
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int topY = endY + (int)(length*Math.sin(angle));*/
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g.setColor(color);
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Graphics2D g2d = (Graphics2D)g;
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g2d.setStroke(new BasicStroke(3));
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g2d.drawLine((int) screenX, (int)screenY, endX, endY);
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g2d.drawPolygon(new int[] {endX - (int)(length*Math.sin(angle)), endX + (int)(length*Math.sin(angle)), endX + (int)(length*Math.cos(angle))},new int[] {endY + (int)(length*Math.cos(angle)), endY - (int)(length*Math.cos(angle)), endY + (int)(length*Math.sin(angle))}, 3);
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/*
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endX
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length = Math.sqrt((end[0]-start[0])**2+(end[1]-start[1])**2)
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rotation =np.atan2(end[0]-start[0],end[1]-start[1])
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//end = (start[0] + length*np.cos(rotation), start[1] + length*np.sin(rotation))
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color ='white'
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//print(start)
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pygame.draw.line(window,color,(start[0],start[1]),(end[0],end[1]),5)
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leftSide =(end[0]-0.2*length*np.sin(rotation),end[1]+0.2*length*np.cos(rotation))
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rightSide =(end[0]+0.2*length*np.sin(rotation),end[1]-0.2*length*np.cos(rotation))
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top =(end[0]+0.2*length*np.cos(rotation),end[1]+0.2*length*np.sin(rotation))
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pygame.draw.polygon(window,
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vector_to_rgb(np.pi*rotation/180, length), (leftSide,rightSide,top),0)*/
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}
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public double screenToCoordsX(double screenX) {return 2*panel.window_maxCoordX*(screenX - maxSX/2)/maxSX;}
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public double screenToCoordsY(double screenY) {return -2*panel.window_maxCoordY*(screenY - maxSY/2)/maxSY;}
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public double coordsToScreenX(double CX) {return 0.5*CX*maxSX/panel.window_maxCoordX + maxSX/2;}
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public double coordsToScreenY(double CY) {return -0.5*CY*maxSY/panel.window_maxCoordY + maxSY/2;}
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}

‎Axes.java‎

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import java.awt.*;
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import java.math.RoundingMode;
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import java.text.DecimalFormat;
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public class Axes
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{
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double maxCX;//max x coord
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double maxCY;
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double SX;//max x pixel (screen)
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double SY;
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Panel panel;
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double tickDistance = 100;
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DecimalFormat df = new DecimalFormat("#.####");
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public Axes(Panel panelInit)
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{
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panel = panelInit;
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maxCX = panel.window_maxCoordX;
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maxCY = panel.window_maxCoordY;
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SX = panel.window_screenX;
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SY = panel.window_screenY;
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df.setRoundingMode(RoundingMode.CEILING);
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}
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public void update(Graphics g)
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{
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g.setColor(Color.white);
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g.setFont(new Font("Calibri", Font.BOLD, 15));
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g.drawLine(0, (int)(SY/2), (int)SX, (int)(SY/2));//horizontal line
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for(double i = 0; i < panel.window_screenX; i += tickDistance)
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{
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if(i + tickDistance/2 != 0)
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{
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g.drawLine((int)(i + tickDistance / 2), 440, (int)(i + tickDistance / 2), 460);
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String text = String.valueOf(screenToCoordsX(i + tickDistance/2));
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g.setColor(Color.black);
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g.setFont(new Font("Calibri", Font.BOLD, 18));
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g.drawString(text, (int)(i + tickDistance / 2), 470);
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g.setFont(new Font("Calibri", Font.PLAIN, 17));
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g.setColor(Color.white);
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g.drawString(text, (int)(i + tickDistance/2), 470);
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}
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}
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g.drawLine((int)(SX/2), 0, (int)(SX/2), (int)SY);//vertical line
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for(double i = 0; i < panel.window_screenY; i += tickDistance)
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{
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if(screenToCoordsY(i + tickDistance/2) != 0)
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{
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String text = String.valueOf(screenToCoordsY(i + tickDistance/2));
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g.setColor(Color.black);
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g.setFont(new Font("Calibri", Font.BOLD, 18));
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g.drawString(text, 820, (int)(i + tickDistance/2));
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g.setFont(new Font("Calibri", Font.PLAIN, 17));
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g.setColor(Color.white);
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g.drawLine(790, (int)(i + tickDistance / 2), 810, (int)(i + tickDistance / 2));
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g.drawString(text, 820, (int)(i + tickDistance/2));
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}
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}
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}
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public double screenToCoordsX(double screenX) {return Double.parseDouble(df.format(2*panel.window_maxCoordX*(screenX - panel.window_screenX/2)/panel.window_screenX));}
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public double screenToCoordsY(double screenY) {return Double.parseDouble(df.format(-2*panel.window_maxCoordY*(screenY - panel.window_screenY/2)/panel.window_screenY));}
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public double coordsToScreenX(double coordX) {return coordX*panel.window_screenX/maxCX;}
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public double coordsToScreenY(double coordY) {return coordY*panel.window_screenY/maxCY;}
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}

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