i have created graphing program takes user inputted y or x intercept form equation , graphs matching line on grid. works, incredibly slow graph lines. fast before added code uses user's input, know inefficiency part. appreciate if take little time through code , give me suggestions/tips on how can make run faster.
this code main frame class:
package src; import java.awt.basicstroke; import java.awt.borderlayout; import java.awt.color; import java.awt.dimension; import java.awt.font; import java.awt.graphics; import java.awt.graphics2d; import java.awt.gridbaglayout; import java.awt.event.actionevent; import java.awt.event.keyevent; import java.awt.geom.line2d; import java.text.decimalformat; import javax.swing.abstractaction; import javax.swing.actionmap; import javax.swing.borderfactory; import javax.swing.inputmap; import javax.swing.jcomponent; import javax.swing.jframe; import javax.swing.jpanel; import javax.swing.jtextfield; import javax.swing.keystroke; /* * class responsible making program's frame */ public class mainframe { public static int width = 1001; public static int height = 1001; public static string equation; public static boolean drawline = false; //public static string equation; public static void main(string[] args) { jframe frame = new jframe(); equationconverter ec = new equationconverter(); //these jpanels put window jpanel northpane = new jpanel(); jpanel southpane = new jpanel(); jpanel eastpane = new jpanel(); jpanel westpane = new jpanel(); color panelcolor = new color(230, 230, 230); jtextfield textfield = new jtextfield(); //jtextpane textpane = new jtextpane(); //set window's layout frame.setlayout(new borderlayout()); //create grid panel @suppresswarnings("serial") jpanel graphpane = new jpanel() { @override protected void paintcomponent(graphics g) { super.paintcomponent(g); graphics2d g2 = (graphics2d)g; setpreferredsize(new dimension(width, height)); setbackground(color.white); g2.setcolor(color.light_gray); int x1 = 0; int y1 = 0; int x2 = 0; int y2 = height; //draw horizontal lines (int = 1; <= 20; i++) { g2.drawline(x1, y1, x2, y2); x1 += width/20; x2 = x1; } g2.drawline(width-1, 0, width-1, height); x1 = 0; y1 = 0; x2 = width; y2 = 0; //draw vertical lines (int = 1; <= 20; i++) { g2.drawline(x1, y1, x2, y2); y1 += height/20; y2 = y1; } g2.drawline(0, height-1, width, height-1); //make x , y axis lines bigger , //a darker color grid lines g2.setstroke(new basicstroke(4)); g2.setcolor(color.black); g2.drawline(500, 0, 500, 1001); g2.drawline(0, 500, 1001, 500); //draw numbers along y axis g2.setfont(new font("defualt", font.plain, 20)); int sx = 475; int sy = 60; string si; (int = 9; >= -9; i--) { if (i != 0) { si = integer.tostring(i); g2.drawstring(si, sx, sy); } sy += 50; } sx = 40; sy = 525; //draw numbers along x axis (int = -9; <= 9; i++) { if (i != 0) { si = integer.tostring(i); g2.drawstring(si, sx, sy); } sx += 50; } if (drawline == true) { double x = 0; double y = 0; string newequation = ""; string finalequation = ""; decimalformat df = new decimalformat("#.####"); g2.setcolor(color.red); equation = textfield.gettext(); equation = equation.tolowercase().replace(" ", ""); if (!equation.equals("")) { if (equation.charat(0) == 'y' && equation.charat(1) == '=') { equation = equation.substring(2); newequation = ec.editstr(equation, 'x'); //draws lines using y intercept form (x = -10; x < 10; x+=0.0001) { //y = (x); finalequation = ec.replacex(newequation, df.format(x), 'x'); y = double.parsedouble(ec.solveequation(finalequation)); g2.draw(new line2d.double(width/2+50*x, height/2-50*y, width/2+50*x, height/2-50*y)); } } else if (equation.charat(0) == 'x' && equation.charat(1) == '=') { equation = equation.substring(2); newequation = ec.editstr(equation, 'y'); //draws lines using x intercept form (y = -10; y < 10; y+=0.0001) { //x = (y); finalequation = ec.replacex(newequation, df.format(y), 'y'); x = double.parsedouble(ec.solveequation(finalequation)); g2.draw(new line2d.double(width/2+50*x, height/2-50*y, width/2+50*x, height/2-50*y)); } } } } else { drawline = false; } } }; //settings graph panel frame.add(graphpane, borderlayout.center); graphpane.setborder(borderfactory.createlineborder(color.black)); //settings north panel frame.add(northpane, borderlayout.north); northpane.setpreferredsize(new dimension(1500, 30)); northpane.setbackground(panelcolor); //settings south panel southpane.add(textfield); textfield.setpreferredsize(new dimension(700, 80)); textfield.setfont(new font("default", font.plain, 60)); textfield.setborder(borderfactory.createlineborder(color.black)); textfield.addactionlistener(new actionlistener() { public void actionperformed(actionevent e) { drawline = true; graphpane.repaint(); } }); //settings east panel frame.add(eastpane, borderlayout.east); westpane.setpreferredsize(new dimension(247, 1500)); westpane.setbackground(panelcolor); //settings west panel frame.add(westpane, borderlayout.west); eastpane.setpreferredsize(new dimension(247, 1500)); eastpane.setbackground(panelcolor); //settings frame frame.settitle("custom graphs"); frame.setsize(1501, 1501); frame.setdefaultcloseoperation(jframe.exit_on_close); frame.setlocationrelativeto(null); frame.setresizable(false); frame.setvisible(true); } } and code class contains methods converting user's equation string computer can use graph line:
package src; import javax.script.scriptengine; import javax.script.scriptenginemanager; /* * class converts user's equation use computer */ public class equationconverter { //this method adds multiplication signs @ necessary points in sting protected string editstr(string str, char xory) { string newstr = str; (int = 0; < str.length(); i++) { //adds multiplicative sign between variables , digits if (i != 0 && str.charat(i) == xory && character.isdigit(str.charat(i-1))) { newstr = str.substring(0, i) + "*" + str.substring(i); } //adds multiplicative sign between parentheses else if (i != 0 && str.charat(i) == '(' && str.charat(i-1) == ')') { newstr = str.substring(0, i) + "*" + str.substring(i); } str = newstr; } return newstr; } //this method replaces character x numeric value of x protected string replacex(string str, string number, char xory) { string newstr = str; (int = 0; < str.length(); i++) { if (i == 0 && str.charat(i) == xory) { if (str.length() == 1) { newstr = number; } else { newstr = number + str.substring(i+1); } } else if (i != 0 && str.charat(i) == xory) { //add parentheses there 2 minus signs if (i+1 == str.length()) { newstr = str.substring(0, i) + "(" + number + ")"; } else { newstr = str.substring(0, i) + "(" + number + ")" + str.substring(i+1); } } str = newstr; } return newstr; } //this method solves string equation , returns numeric value protected string solveequation(string str) { scriptenginemanager mgr = new scriptenginemanager(); scriptengine engine = mgr.getenginebyname("javascript"); try { return engine.eval(str).tostring(); } catch (exception e) { system.exit(0); return ""; } } }
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