Фрактал — различия между версиями

  1 window.addEventListener('load',main,false);
  2 function main () {
  3 	var x; var y;
  4 	var ctx = cnv.getContext('2d');
  5 	var h = cnv.height;
  6 	var w = cnv.width;
  7 	var scale = 1000;
  8 	var a_11; var a_12; var a_21; var a_22;
  9 	var numb1; var numb2; var decim;
 10 	var interv;
 11 	var clear;
 12 	var butt = document.getElementById('downloadimg');
 13 	var update = document.getElementById('refresh');
 14 	X = []; // массив начальных иксов
 15 	Y = []; // массив начальных игриков
 16 	var move = false;
 17 	var numberof;
 18 	var z = 1;
 19 	var RGB = [];
 20 	var z2 = 1;
 21 	var iterations = document.getElementById('number_it');
 22 	// начальные условия 
 23 	a_11 = 1;
 24 	a_12 = 1;
 25 	a_21 = 1;
 26 	a_22 = 1;
 27 	var N = 200000;
 28 	var x_min = 0; var y_min = 0;
 29 	var x_max = 1; var y_max = 1;
 30 	var x_move; var y_move;
 31 	var x_oldmin = 0;
 32 	var x_oldmax = scale;
 33 	var y_oldmin = 0;
 34 	var y_oldmax = scale;
 35 	var x_relativemin = 0;
 36 	var x_relativemax = scale;
 37 	var y_relativemin = 0;
 38 	var y_relativemax = scale;
 39 	var intermid;
 40 	var imageData = ctx.createImageData(w,h);
 41 	var imageData2;
 42 	var upd = false;
 43 	
 44 	x_minim.onchange = function () {
 45 		x_min = parseFloat(document.getElementById('x_minim').value);
 46 		z = 1/(x_max - x_min);
 47 		z2 = 1;
 48 		y_max = y_min + x_max - x_min;
 49 		x_relativemin = 0;
 50 		x_relativemax = scale;
 51 		y_relativemin = 0;
 52 		y_relativemax = scale;
 53 	}
 54 	x_maxim.onchange = function () {
 55 		x_max = parseFloat(document.getElementById('x_maxim').value);
 56 		z = 1/(x_max - x_min);
 57 		z2 = 1;
 58 		y_max = y_min + x_max - x_min;
 59 		x_relativemin = 0;
 60 		x_relativemax = scale;
 61 		y_relativemin = 0;
 62 		y_relativemax = scale;
 63 	}
 64 	y_minim.onchange = function () {
 65 		y_min = parseFloat(document.getElementById('y_minim').value);
 66 		z = 1/(x_max - x_min);
 67 		z2 = 1;
 68 		y_max = y_min + x_max - x_min;
 69 		x_relativemin = 0;
 70 		x_relativemax = scale;
 71 		y_relativemin = 0;
 72 		y_relativemax = scale;
 73 	}
 74 		
 75 	// заполняем холст непрозрачными белыми пикселями для ускорения последующего рисования
 76 	for (i = 0; i<1000; i++) {
 77 			for (j = 0; j<1000; j++) {
 78 				index = parseInt((i*w + j)*4);
 79 				imageData.data[index+0] = 255;
 80 				imageData.data[index+1] = 255;
 81 				imageData.data[index+2] = 255;
 82 				imageData.data[index+3] = 255;
 83 			}
 84 		}
 85 	ctx.putImageData(imageData,0,0);
 86 
 87 	iterations.onchange = function () {
 88 		N = document.getElementById('number_it').value;
 89 	}
 90 
 91 	butt.onclick = function () {
 92 	var dataURL = cnv.toDataURL("image/jpeg");
 93 	var link = document.createElement("a");
 94 	document.body.appendChild(link); 
 95 	link.href = dataURL;
 96 	link.download = "my-image-name.jpg";
 97 	link.click();
 98 	document.body.removeChild(link);
 99 	}
100 	update.onclick = function () { clearcanv(); upd = true;
101 	if ((document.getElementById('x_o') != 0 )||(document.getElementById('y_o') != 0)){
102 			r = Math.floor(Math.random()*256);
103 			g = Math.floor(Math.random()*256);
104 			b = Math.floor(Math.random()*256);
105 			RGB.push(r);
106 			RGB.push(g);
107 			RGB.push(b);
108 	X.push(document.getElementById('x_o').value); Y.push(document.getElementById('y_o').value);
109 	}
110 	control();
111 	}
112 	a11.onchange = function() {
113 		a_11 = parseFloat(document.getElementById('a11').value);
114 		document.getElementById('num').value = 0;
115 		angle = 0;
116 	}
117 	a12.onchange = function() {
118 		a_12 = parseFloat(document.getElementById('a12').value);
119 		document.getElementById('num').value = 0;
120 		angle = 0;
121 	}
122 	a21.onchange = function() {
123 		a_21 = parseFloat(document.getElementById('a21').value);
124 		document.getElementById('num').value = 0;
125 		angle = 0;
126 	}
127 	a22.onchange = function() {
128 		a_22 = parseFloat(document.getElementById('a22').value);
129 		document.getElementById('num').value = 0;
130 		angle = 0;
131 	}
132 
133 	cnv.onmousedown = function() {
134 		var zoom = document.getElementById('zoom_check');
135 		if (!zoom.checked) {
136 		var rect = cnv.getBoundingClientRect();
137 		if (z != 1) {
138 			z2 = x_max - x_min;
139 			x = x_min + (event.clientX - rect.left)*z2/scale;
140 			y = y_min + (event.clientY - rect.top)*z2/scale;
141 		} else {
142 			x = (event.clientX - rect.left)/scale;
143 			y = (event.clientY - rect.top)/scale;
144 		}
145 		clear = document.getElementsByName('clear_rect');
146 		if (clear[1].checked == true) {
147 			r = Math.floor(Math.random()*256);
148 			g = Math.floor(Math.random()*256);
149 			b = Math.floor(Math.random()*256);
150 		} else {
151 		clearcanv ();
152 		r = Math.floor(Math.random()*256);
153 		g = Math.floor(Math.random()*256);
154 		b = Math.floor(Math.random()*256);
155 		}
156 		X.push(x);
157 		Y.push(y);
158 		RGB.push(r);
159 		RGB.push(g);
160 		RGB.push(b);
161 		control();
162 		} else { 
163 		var rect = cnv.getBoundingClientRect();
164 		z2 = x_max - x_min;
165 		x_oldmin = x_min*scale;
166 		y_oldmin = y_min*scale;
167 		x_oldmax = x_max*scale;
168 		y_oldmax = y_max*scale;
169 		x_min = (event.clientX - rect.left)*z2 + x_oldmin;
170 		y_min = (event.clientY - rect.top)*z2 + y_oldmin;
171 		x_relativemin = event.clientX - rect.left;
172 		y_relativemin = event.clientY - rect.top;
173 		ctx.beginPath();
174 		ctx.rect(event.clientX - rect.left,event.clientY - rect.top,1,1);
175 		ctx.fillStyle = 'blue';
176 		ctx.fill();
177 		move = true;
178 		imageData2 = ctx.getImageData(0,0,w,h);
179 		}
180 		
181 	}
182 
183 	cnv.onmousemove = function () {
184 		if (move) {
185 		ctx.putImageData(imageData2,0,0);
186 		var rect = cnv.getBoundingClientRect();
187 		y_move = (event.clientY - rect.top);
188 		x_move = (y_move-y_relativemin) + x_relativemin;
189 		ctx.beginPath();
190 		ctx.rect(x_relativemin,y_relativemin,x_move-x_relativemin,y_move-y_relativemin);
191 		ctx.stroke();
192 		}
193 	}
194 	
195 	cnv.onmouseup = function () {
196 		zoom = document.getElementById('zoom_check');
197 		if (zoom.checked) { 
198 		x_relativemax = x_move;
199 		y_relativemax = y_move;
200 			y_max = y_move*z2 + y_oldmin;
201 			x_max = x_move*z2 + x_oldmin;
202 			x_min = x_min/scale;
203 			y_min = y_min/scale;
204 			x_max = x_max/scale;
205 			y_max = y_max/scale;
206 			if (x_min > x_max) {
207 				intermid = x_min;
208 				x_min = x_max;
209 				x_max = intermid;
210 			}
211 			if (y_min > y_max) { 
212 				intermid = y_min;
213 				y_min = y_max;
214 				y_max = intermid;
215 			}
216 			z = z*scale/(x_relativemax - x_relativemin);
217 			some_span.innerHTML = "Увеличение в "+z.toFixed(1)+" раз";
218 			clearcanv ();
219 			move = false;
220 			control();
221 		}
222 
223 	}
224 
225 	function Func (numb) {
226 		decim = parseFloat(numb) - Math.floor(numb);
227 		return(decim);
228 	}
229 	
230 	function coord() {
231 		numb1 = a_11*x+a_12*y;
232 		x = Func(numb1);
233 		numb2 = a_21*x+a_22*y;
234 		y = Func(numb2);
235 	}
236 
237 	function draw() { 
238 		if ((x>=x_min)&&(x<=x_max)&&(y>=y_min)&&(y<=y_max)) {
239 				index = (Math.floor((y-y_min)*z*scale)*w + Math.floor((x-x_min)*z*scale))*4;
240 				imageData.data[index+0] = r;
241 				imageData.data[index+1] = g;
242 				imageData.data[index+2] = b;
243 			}
244 	}
245 	// функция отчистки канваса 
246 	function clearcanv () {
247 		for (i = 0; i<1000; i++) {
248 			for (j = 0; j<1000; j++) {
249 				index = parseInt((i*w + j)*4);
250 				imageData.data[index+0] = 255;
251 				imageData.data[index+1] = 255;
252 				imageData.data[index+2] = 255;
253 			}
254 		}
255 		ctx.putImageData(imageData,0,0);
256 	}
257 	
258 	function control () {
259 		zoom = document.getElementById('zoom_check');
260 		if ((zoom.checked)||(upd == true)) {
261 			numberof = X.length;
262 			for (m = 0; m<numberof; m++) {
263 				x = X[m];
264 				y = Y[m];
265 				x_s.innerHTML = x; y_s.innerHTML = y;
266 				r = Number(RGB[m*3]);
267 				g = Number(RGB[m*3+1]);
268 				b = Number(RGB[m*3+2]);
269 				for (j = 0;j<=N; j++){
270 				coord();
271 				draw();
272 				}
273 				upd = false;
274 			}
275 		} else {
276 			x_s.innerHTML = x; y_s.innerHTML = y;
277 			for (j = 0;j<=N; j++){
278 				coord();
279 				draw();
280 				}
281 		}
282 		ctx.putImageData(imageData,0,0);
283 		document.getElementById('x_minim').value = x_min;
284 		document.getElementById('y_minim').value = y_min;
285 		document.getElementById('x_maxim').value = x_max;
286 	}
287 
288 	function set_exp(N_exp) {
289 		var k = Number(N_exp);
290 		clearcanv ();
291 		X = [];
292 		Y = [];
293 		RGB = [];
294 		z = 1;
295 		z2 = 1;
296 		x_min = 0; y_min = 0; x_max = 1; y_max = 1; x_oldmin = 0; y_oldmin = 0; x_oldmax = scale; y_oldmax = scale;
297 		if (N_exp == 1) {X.push(0.46); Y.push(0.63); X.push(0.613); Y.push(0.582); a_11 = 1; 	a_12 = 1;	    a_21 = -0.9;	a_22 = 1; } 
298 		if (N_exp == 2) {X.push(0.31); Y.push(0.32);  a_11 = 1; 	a_12 = 0.5;	    a_21 = -0.5;	a_22 = 1; }
299 		if (N_exp == 3) {X.push(0.69); Y.push(0.23); a_11 = 1;   a_12 = 0.1296;	    a_21 = -0.1296;	a_22 = 1; }  
300 		if (N_exp == 4) {X.push(0.15); Y.push(0.63); a_11 = -0.9899924966004454;   a_12 = 0.1411200080598672;	    a_21 = -0.1411200080598672;	a_22 = -0.9899924966004454; }  
301 		if (N_exp) {
302 			
303 			a11.value = a_11;
304 			a12.value = a_12; 
305 			a21.value = a_21;   
306 			a22.value = a_22;	
307 			upd = true;
308 		}
309 		numberof = X.length;
310 		for (m=0; m<numberof; m++) {
311 			r = Math.floor(Math.random()*256);
312 			g = Math.floor(Math.random()*256);
313 			b = Math.floor(Math.random()*256);
314 			RGB.push(r);
315 			RGB.push(g);
316 			RGB.push(b);
317 		}
318 	}	
319 	num.onchange = function() { set_exp(document.getElementById('num').value); control();}
320 }