本文實例講述了java實現的簡單畫圖板。分享給大家供大家參考，具體如下：
這個畫圖板是我好久之前做的，之后浙大的同學需要做課設然后就花了一點時間將它改了一下，變得簡單些能夠方便擴充功能，同時學習java基礎
先截圖一下吧，就可以知道有哪些功能了~
三個分區，上面選擇圖形，下面選擇顏色，立體圓就是一個分形，也先放著不需要的同學可以注釋了它
代碼很簡單，就是jpanel進行分區，得到畫筆，同時使用畫圖的函數就可以做到了
貼代碼應該很快就會了~
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package awtdemo;import java.awt.borderlayout;import java.awt.color;import java.awt.dimension;import java.awt.flowlayout;import javax.swing.jbutton;import javax.swing.jframe;import javax.swing.jpanel;@suppresswarnings("serial")public class drawmain extends jpanel { public static void main(string[] args) { // todo auto-generated method stub drawmain draw = new drawmain(); draw.initui(); } public void initui() { jframe jf = new jframe(); jf.setsize(1000, 780); jf.settitle("簡單畫板"); jf.setdefaultcloseoperation(3); jf.setlocationrelativeto(null); jf.setlayout(new borderlayout()); // 實例化事件監聽類 drawlistener dl = new drawlistener(this); // 實現中間面板 this.setbackground(color.white); jf.add(this, borderlayout.center); // 實現性狀面板 jpanel shapepanel = new jpanel(); shapepanel.setbackground(color.black); shapepanel.setlayout(new flowlayout(flowlayout.center)); shapepanel.setbackground(color.gray); ; string[] shape = { "直線", "曲線", "圓", "噴槍", "橡皮擦", "矩形", "橢圓", "圓角矩形", "弧線", "多邊形", "圖形", "三角形", "立體圓", }; for (int i = 0; i < shape.length; i++) { jbutton button = new jbutton(shape[i]); button.setbackground(color.white); button.addactionlistener(dl); // 添加事件監聽機制 shapepanel.add(button); } jf.add(shapepanel, borderlayout.north); // 實現顏色面板 jpanel colorpanel = new jpanel(); colorpanel.setbackground(color.black); colorpanel.setlayout(new flowlayout(flowlayout.center)); colorpanel.setbackground(color.gray); ; color[] color = { color.black, color.blue, color.white, color.gray, color.red, color.cyan, color.green, color.darkgray, color.pink }; for (int i = 0; i < color.length; i++) { jbutton button = new jbutton(); button.addactionlistener(dl); // 添加事件監聽機制 button.setpreferredsize(new dimension(30, 30)); button.setbackground(color[i]); colorpanel.add(button); } jf.add(colorpanel, borderlayout.south); jf.setvisible(true); this.addmouselistener(dl); this.addmousemotionlistener(dl); }} |
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package awtdemo;import java.awt.basicstroke;import java.awt.color;import java.awt.graphics2d;import java.awt.renderinghints;import java.awt.event.actionevent;import java.awt.event.actionlistener;import java.awt.event.mouseadapter;import java.awt.event.mouseevent;import java.util.random;import javax.swing.jbutton;public class drawlistener extends mouseadapter implements actionlistener { private int x1, y1, x2, y2; private int newx1, newy1, newx2, newy2; private graphics2d g; private drawmain df; private boolean flag = false; string shape = "直線"; color color; private int[] arrx = new int[4]; private int[] arry = new int[4]; private int temp = 0; drawlistener(drawmain d) { df = d; } // 獲取形狀和顏色 public void actionperformed(actionevent e) { if (e.getactioncommand().equals("")) { jbutton button = (jbutton) e.getsource(); color = button.getbackground(); system.out.println("color = " + color); } else { jbutton button = (jbutton) e.getsource(); shape = button.getactioncommand(); system.out.println("string = " + shape); } } // 實現畫筆 public void mousepressed(mouseevent e) { g = (graphics2d) df.getgraphics(); g.setcolor(color); x1 = e.getx(); y1 = e.gety(); } public void mousereleased(mouseevent e) { x2 = e.getx(); y2 = e.gety(); if (shape.equals("直線")) { g.drawline(x1, y1, x2, y2); } else if (shape.equals("弧線")) { g.drawarc(x1, y1, math.abs(x2 - x1), math.abs(y2 - y1), 0, 180); } else if (shape.equals("多邊形") && !flag) { g.drawline(x1, y1, x2, y2); newx1 = x1; newy1 = y1; newx2 = x2; newy2 = y2; flag = true; } else if (shape.equals("圓")) { g.drawoval(x1, y1, math.abs(x2 - x1), math.abs(y2 - y1)); } else if (shape.equals("矩形")) { g.drawrect(x1, y1, math.abs(x2 - x1), math.abs(y2 - y1)); } else if (shape.equals("圓角矩形")) { g.drawroundrect(x1, y1, math.abs(x2 - x1), math.abs(y2 - y1), 2, 10); } else if (shape.equals("橢圓")) { g.drawoval(x1, y1, math.abs(x2 - x1), math.abs(y2 - y1)); } } public void mouseclicked(mouseevent e) { if (shape.equals("多邊形") && flag) { x2 = e.getx(); y2 = e.gety(); if (e.getclickcount() == 2) { g.drawline(newx1, newy1, newx2, newy2); flag = false; } g.drawline(newx2, newy2, x2, y2); newx2 = x2; newy2 = y2; } else if (shape.equals("圖形")) { arrx[temp] = e.getx(); arry[temp] = e.gety(); temp++; if (temp == 4) { int x = arrx[3]; int y = arry[3]; for (int i = 0; i <= 10000; i++) { random ran = new random(); int k = ran.nextint(3); x = (x + arrx[k]) / 2; y = (y + arry[k]) / 2; g.drawline(x, y, x, y); } temp = 0; } } else if (shape.equals("立體圓")) { // double a=-2,b=-2,c=-1.2,d=2; double a = 1.40, b = 1.56, c = 1.40, d = -6.56; double x = 0, xo = 0; double y = 0, yo = 0; color[] col = { color.blue, color.cyan, color.green, color.magenta, color.red, color.yellow }; for (int i = 0; i <= 90000; i++) { random r = new random(); // 增加顏色 int r = r.nextint(col.length); g.setcolor(col[r]); // x=math.sin(a*yo)-math.cos(b*xo); // y=math.sin(c*xo)-math.cos(d*yo); x = d * math.sin(a * xo) - math.sin(b * yo); y = c * math.cos(a * xo) + math.cos(b * yo); int temp_x = (int) (x * 50); int temp_y = (int) (y * 50); g.drawline(temp_x + 500, temp_y + 300, temp_x + 500, temp_y + 300); xo = x; yo = y; } } else if (shape.equals("三角形")) { double a = -2, b = -2, c = -1.2, d = 2; double x = 0, xo = 0; double y = 0, yo = 0; color[] col = { color.blue, color.cyan, color.green, color.magenta, color.red, color.yellow }; for (int i = 0; i <= 90000; i++) { random r = new random(); // 增加顏色 int r = r.nextint(col.length); g.setcolor(col[r]); x = math.sin(a * yo) - math.cos(b * xo); y = math.sin(c * xo) - math.cos(d * yo); int temp_x = (int) (x * 50); int temp_y = (int) (y * 50); g.drawline(temp_x + 500, temp_y + 300, temp_x + 500, temp_y + 300); xo = x; yo = y; } } } public void mousedragged(mouseevent e) { x2 = e.getx(); y2 = e.gety(); if (shape.equals("曲線")) { // g.setstroke(new basicstroke(10)); // g.setrenderinghint(renderinghints.key_antialiasing, // renderinghints.value_antialias_on); g.drawline(x1, y1, x2, y2); x1 = x2; y1 = y2; } else if (shape.equals("橡皮擦")) { g.setstroke(new basicstroke(80)); g.setrenderinghint(renderinghints.key_antialiasing, renderinghints.value_antialias_on); g.setcolor(color.white); g.drawline(x1, y1, x2, y2); x1 = x2; y1 = y2; } else if (shape.equals("噴槍")) { // g.setstroke(new basicstroke(2)); //不用加粗 // g.setrenderinghint(renderinghints.key_antialiasing, // renderinghints.value_antialias_on); for (int k = 0; k < 20; k++) { random i = new random(); int a = i.nextint(8); int b = i.nextint(10); g.drawline(x2 + a, y2 + b, x2 + a, y2 + b); } } }} |
代碼量也還是挺小的，因為是簡單畫板嘛~~
希望本文所述對大家java程序設計有所幫助。
原文鏈接：https://blog.csdn.net/SX_csu2016sw/article/details/76570307
