Фон с появляющимися цветами

Пример:

HTML:

<canvas id="flowers"></canvas>

1	<canvas id="flowers"></canvas>

CSS:

#flowers {
	height: 500px;
	width: 100%;
	background: radial-gradient( farthest-corner circle at left bottom, #e1fd3e, #174709);
}

#flowers {

height: 500px;

width: 100%;

background: radial-gradient( farthest-corner circle at left bottom, #e1fd3e, #174709);

}

JS:

var c = document.getElementById("flowers");
var ctx = c.getContext("2d");
var cw = c.width = c.offsetWidth;
var ch = c.height = c.offsetHeight;
var cX = cw / 2, cY = ch / 2;
var rad = Math.PI / 180;
var howMany = 40;
var t = 1 / 5;
ctx.strokeStyle = "white";
ctx.shadowBlur = 2;
ctx.shadowOffsetX = 2;
ctx.shadowOffsetY = 2;
ctx.shadowColor = "#333";
ctx.globalAlpha = 1;
var colors = ["#930c37", "#ea767a", "#ee6133", "#ecac43", "#fb9983", "#f9bc9f", "#f8ed38", "#a8e3f9", "#d1f2fd", "#ecd5f5", "#fee4fd", "#8520b4", "#FA2E59", "#FF703F", "#FF703F", "#F7BC05", "#ECF6BB", "#76BCAD"];
var flowers = [];
for (var hm = 0; hm < howMany; hm++) {
	flowers[hm] = {}
	flowers[hm].cx = ~~(Math.random() * cw) + 1;
	flowers[hm].cy = ~~(Math.random() * ch) + 1;
	flowers[hm].R = randomIntFromInterval(20, 50);
	flowers[hm].Ri = randomIntFromInterval(5, 7) / 10;
	flowers[hm].k = randomIntFromInterval(5, 10) / 10;
	flowers[hm].ki = randomIntFromInterval(2, 7) / 100;
	flowers[hm].K = randomIntFromInterval(5, 16) / 10;
	flowers[hm].fs = ~~(Math.random() * colors.length) + 1;
	flowers[hm].cs = ~~(Math.random() * colors.length) + 1;
	flowers[hm].nP = randomIntFromInterval(4, 10);
	flowers[hm].spacing = randomIntFromInterval(4, 10);
}
function buildRy(R, k, cx, cy, nP, spacing) {
	var r = R * k;
	var A = 360 / nP;
	var petals = [];
	for (var i = 0; i < nP; i++) {
		var ry = [];
		ry[ry.length] = {
			x: cx,
			y: cy
		}
		var a1 = i * A + spacing;
		var x1 = ~~(cx + R * Math.cos(a1 * rad));
		var y1 = ~~(cy + R * Math.sin(a1 * rad));
		ry[ry.length] = {
			x: x1,
			y: y1,
			a: a1
		}
		var a2 = i * A + A / 2;
		var x2 = ~~(cx + r * Math.cos(a2 * rad));
		var y2 = ~~(cy + r * Math.sin(a2 * rad));
		ry[ry.length] = {
			x: x2,
			y: y2,
			a: a2
		}
		var a3 = i * A + A - spacing
		var x3 = ~~(cx + R * Math.cos(a3 * rad));
		var y3 = ~~(cy + R * Math.sin(a3 * rad));
		ry[ry.length] = {
			x: x3,
			y: y3,
			a: a3
		}
		ry[ry.length] = {
			x: cx,
			y: cy
		}
		petals[i] = ry;
	}
	return petals
}
function update() {
	ctx.clearRect(0, 0, cw, ch);
	for (var f = 0; f < flowers.length; f++) {
		if (flowers[f].k < flowers[f].K) {
			flowers[f].R += flowers[f].Ri;
			flowers[f].k += flowers[f].ki;
		}
		var R = flowers[f].R;
		var Ri = flowers[f].Ri;
		var k = flowers[f].k;
		var ki = flowers[f].ki;
		var K = flowers[f].K;
		var cx = flowers[f].cx;
		var cy = flowers[f].cy;
		var fs = colors[flowers[f].fs];
		var cs = colors[flowers[f].cs];
		var nP = flowers[f].nP;
		var spacing = flowers[f].spacing;
		for (var petal = 0; petal < petals.length; petal++) {//
			petals = buildRy(R, k, cx, cy, nP, spacing);
			ctx.fillStyle = fs;
			drawCurve(petals[petal]);
		}
		drawCenter(k, cx, cy, cs);
	}
	requestId = window.requestAnimationFrame(update);
}
function drawCenter(k, cx, cy, cs) {
	ctx.beginPath();
	ctx.fillStyle = cs;
	ctx.arc(cx, cy, k * 10, 0, 2 * Math.PI)
	ctx.fill();
}
function drawCurve(p) {
	var pc = controlPoints(p); 
	ctx.beginPath();
	ctx.moveTo(p[0].x, p[0].y);
	ctx.quadraticCurveTo(pc[1][1].x, pc[1][1].y, p[1].x, p[1].y);
	if (p.length > 2) {
		for (var i = 1; i < p.length - 2; i++) {
			ctx.bezierCurveTo(pc[i][0].x, pc[i][0].y, pc[i + 1][1].x, pc[i + 1][1].y, p[i + 1].x, p[i + 1].y);
		}
		var n = p.length - 1;
		ctx.quadraticCurveTo(pc[n - 1][0].x, pc[n - 1][0].y, p[n].x, p[n].y);
	}
	ctx.fill();
}
function controlPoints(p) {
	var pc = [];
	for (var i = 1; i < p.length - 1; i++) {
		var dx = p[i - 1].x - p[i + 1].x; 
		var dy = p[i - 1].y - p[i + 1].y; 
		var x1 = p[i].x - dx * t;
		var y1 = p[i].y - dy * t;
		var o1 = {
			x: x1,
			y: y1
		};
		var x2 = p[i].x + dx * t;
		var y2 = p[i].y + dy * t;
		var o2 = {
			x: x2,
			y: y2
		};
		pc[i] = [];
		pc[i].push(o1);
		pc[i].push(o2);
	}
	return pc;
}
function randomIntFromInterval(mn, mx) {
	return ~~(Math.random() * (mx - mn + 1) + mn);
}
for (var f = 0; f < flowers.length; f++) {
	var R = flowers[f].R;
	var Ri = flowers[f].Ri;
	var k = flowers[f].k;
	var ki = flowers[f].ki;
	var K = flowers[f].K;
	var cx = flowers[f].cx;
	var cy = flowers[f].cy;
	var fs = colors[flowers[f].fs];
	var cs = colors[flowers[f].cs];
	var nP = flowers[f].nP;
	var spacing = flowers[f].spacing;
	var petals = buildRy(R, k, cx, cy, nP, spacing);
	ctx.fillStyle = colors[flowers[f].fs];
	for (var i = 0; i < petals.length; i++) {
		drawCurve(petals[i]);
	}
}
requestId = window.requestAnimationFrame(update);
window.setTimeout(function() {
	if (requestId) {
		window.cancelAnimationFrame(requestId)
	};
}, 6000)

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

var c = document.getElementById("flowers");

var ctx = c.getContext("2d");

var cw = c.width = c.offsetWidth;

var ch = c.height = c.offsetHeight;

var cX = cw / 2, cY = ch / 2;

var rad = Math.PI / 180;

var howMany = 40;

var t = 1 / 5;

ctx.strokeStyle = "white";

ctx.shadowBlur = 2;

ctx.shadowOffsetX = 2;

ctx.shadowOffsetY = 2;

ctx.shadowColor = "#333";

ctx.globalAlpha = 1;

var colors = ["#930c37", "#ea767a", "#ee6133", "#ecac43", "#fb9983", "#f9bc9f", "#f8ed38", "#a8e3f9", "#d1f2fd", "#ecd5f5", "#fee4fd", "#8520b4", "#FA2E59", "#FF703F", "#FF703F", "#F7BC05", "#ECF6BB", "#76BCAD"];

var flowers = [];

for (var hm = 0; hm < howMany; hm++) {

flowers[hm] = {}

flowers[hm].cx = ~~(Math.random() * cw) + 1;

flowers[hm].cy = ~~(Math.random() * ch) + 1;

flowers[hm].R = randomIntFromInterval(20, 50);

flowers[hm].Ri = randomIntFromInterval(5, 7) / 10;

flowers[hm].k = randomIntFromInterval(5, 10) / 10;

flowers[hm].ki = randomIntFromInterval(2, 7) / 100;

flowers[hm].K = randomIntFromInterval(5, 16) / 10;

flowers[hm].fs = ~~(Math.random() * colors.length) + 1;

flowers[hm].cs = ~~(Math.random() * colors.length) + 1;

flowers[hm].nP = randomIntFromInterval(4, 10);

flowers[hm].spacing = randomIntFromInterval(4, 10);

}

function buildRy(R, k, cx, cy, nP, spacing) {

var r = R * k;

var A = 360 / nP;

var petals = [];

for (var i = 0; i < nP; i++) {

var ry = [];

ry[ry.length] = {

x: cx,

y: cy

}

var a1 = i * A + spacing;

var x1 = ~~(cx + R * Math.cos(a1 * rad));

var y1 = ~~(cy + R * Math.sin(a1 * rad));

ry[ry.length] = {

x: x1,

y: y1,

a: a1

}

var a2 = i * A + A / 2;

var x2 = ~~(cx + r * Math.cos(a2 * rad));

var y2 = ~~(cy + r * Math.sin(a2 * rad));

ry[ry.length] = {

x: x2,

y: y2,

a: a2

}

var a3 = i * A + A - spacing

var x3 = ~~(cx + R * Math.cos(a3 * rad));

var y3 = ~~(cy + R * Math.sin(a3 * rad));

ry[ry.length] = {

x: x3,

y: y3,

a: a3

}

ry[ry.length] = {

x: cx,

y: cy

}

petals[i] = ry;

}

return petals

}

function update() {

ctx.clearRect(0, 0, cw, ch);

for (var f = 0; f < flowers.length; f++) {

if (flowers[f].k < flowers[f].K) {

flowers[f].R += flowers[f].Ri;

flowers[f].k += flowers[f].ki;

}

var R = flowers[f].R;

var Ri = flowers[f].Ri;

var k = flowers[f].k;

var ki = flowers[f].ki;

var K = flowers[f].K;

var cx = flowers[f].cx;

var cy = flowers[f].cy;

var fs = colors[flowers[f].fs];

var cs = colors[flowers[f].cs];

var nP = flowers[f].nP;

var spacing = flowers[f].spacing;

for (var petal = 0; petal < petals.length; petal++) {//

petals = buildRy(R, k, cx, cy, nP, spacing);

ctx.fillStyle = fs;

drawCurve(petals[petal]);

}

drawCenter(k, cx, cy, cs);

}

requestId = window.requestAnimationFrame(update);

}

function drawCenter(k, cx, cy, cs) {

ctx.beginPath();

ctx.fillStyle = cs;

ctx.arc(cx, cy, k * 10, 0, 2 * Math.PI)

ctx.fill();

}

function drawCurve(p) {

var pc = controlPoints(p);

ctx.beginPath();

ctx.moveTo(p[0].x, p[0].y);

ctx.quadraticCurveTo(pc[1][1].x, pc[1][1].y, p[1].x, p[1].y);

if (p.length > 2) {

for (var i = 1; i < p.length - 2; i++) {

ctx.bezierCurveTo(pc[i][0].x, pc[i][0].y, pc[i + 1][1].x, pc[i + 1][1].y, p[i + 1].x, p[i + 1].y);

}

var n = p.length - 1;

ctx.quadraticCurveTo(pc[n - 1][0].x, pc[n - 1][0].y, p[n].x, p[n].y);

}

ctx.fill();

}

function controlPoints(p) {

var pc = [];

for (var i = 1; i < p.length - 1; i++) {

var dx = p[i - 1].x - p[i + 1].x;

var dy = p[i - 1].y - p[i + 1].y;

var x1 = p[i].x - dx * t;

var y1 = p[i].y - dy * t;

var o1 = {

x: x1,

y: y1

};

var x2 = p[i].x + dx * t;

var y2 = p[i].y + dy * t;

var o2 = {

x: x2,

y: y2

};

pc[i] = [];

pc[i].push(o1);

pc[i].push(o2);

}

return pc;

}

function randomIntFromInterval(mn, mx) {

return ~~(Math.random() * (mx - mn + 1) + mn);

}

for (var f = 0; f < flowers.length; f++) {

var R = flowers[f].R;

var Ri = flowers[f].Ri;

var k = flowers[f].k;

var ki = flowers[f].ki;

var K = flowers[f].K;

var cx = flowers[f].cx;

var cy = flowers[f].cy;

var fs = colors[flowers[f].fs];

var cs = colors[flowers[f].cs];

var nP = flowers[f].nP;

var spacing = flowers[f].spacing;

var petals = buildRy(R, k, cx, cy, nP, spacing);

ctx.fillStyle = colors[flowers[f].fs];

for (var i = 0; i < petals.length; i++) {

drawCurve(petals[i]);

}

requestId = window.requestAnimationFrame(update);

window.setTimeout(function() {

if (requestId) {

window.cancelAnimationFrame(requestId)

};

}, 6000)

Некоторые настройки:

howMany - количество цветов

shadowBlur - размытие тени

shadowOffsetX - смещение тени по X

shadowOffsetY - смещение тени по Y

shadowColor - цвет тени

colors - цвета цветов

Найдено на codepen.io у пользователя Gabi

Пример:

HTML:

CSS:

JS:

Некоторые настройки:

Смотрите также:

Добавить комментарий: