Hí anh em chúc anh em 1 ngày tốt lành,nay mình share cho anh em 1 code nho nhỏ học tập,có thể lấy tỏ tình: trái tim nó phát sáng chớp nháy liên tục nhé:
mình sẽ đưa html,css,js bản chưa gắn cho anh em,còn nếu muốn lấy bản hoàn chĩnh gắn sẵn css,js đã optimize thì like comment ủng hộ mình nhé:
HTML:<body> <canvas id="canvas" width="1400" height="600"></canvas> </body>
CSS:body { background-color: #000; margin: 0; overflow: hidden; background-repeat: no-repeat; }
Bản đã gắn sẵn+optimize:JavaScript:var canvas = document.getElementById("canvas"); canvas.width = window.innerWidth; canvas.height = window.innerHeight; // Initialize the GL context var gl = canvas.getContext('webgl'); if(!gl){ console.error("Unable to initialize WebGL."); } //Time var time = 0.0; //************** Shader sources ************** var vertexSource = ` attribute vec2 position; void main() { gl_Position = vec4(position, 0.0, 1.0); } `; var fragmentSource = ` precision highp float; uniform float width; uniform float height; vec2 resolution = vec2(width, height); uniform float time; #define POINT_COUNT 8 vec2 points[POINT_COUNT]; const float speed = -0.5; const float len = 0.25; float intensity = 1.3; float radius = 0.008; //https://www.shadertoy.com/view/MlKcDD //Signed distance to a quadratic bezier float sdBezier(vec2 pos, vec2 A, vec2 B, vec2 C){ vec2 a = B - A; vec2 b = A - 2.0*B + C; vec2 c = a * 2.0; vec2 d = A - pos; float kk = 1.0 / dot(b,b); float kx = kk * dot(a,b); float ky = kk * (2.0*dot(a,a)+dot(d,b)) / 3.0; float kz = kk * dot(d,a); float res = 0.0; float p = ky - kx*kx; float p3 = p*p*p; float q = kx*(2.0*kx*kx - 3.0*ky) + kz; float h = q*q + 4.0*p3; if(h >= 0.0){ h = sqrt(h); vec2 x = (vec2(h, -h) - q) / 2.0; vec2 uv = sign(x)*pow(abs(x), vec2(1.0/3.0)); float t = uv.x + uv.y - kx; t = clamp( t, 0.0, 1.0 ); // 1 root vec2 qos = d + (c + b*t)*t; res = length(qos); }else{ float z = sqrt(-p); float v = acos( q/(p*z*2.0) ) / 3.0; float m = cos(v); float n = sin(v)*1.732050808; vec3 t = vec3(m + m, -n - m, n - m) * z - kx; t = clamp( t, 0.0, 1.0 ); // 3 roots vec2 qos = d + (c + b*t.x)*t.x; float dis = dot(qos,qos); res = dis; qos = d + (c + b*t.y)*t.y; dis = dot(qos,qos); res = min(res,dis); qos = d + (c + b*t.z)*t.z; dis = dot(qos,qos); res = min(res,dis); res = sqrt( res ); } return res; } //http://mathworld.wolfram.com/HeartCurve.html vec2 getHeartPosition(float t){ return vec2(16.0 * sin(t) * sin(t) * sin(t), -(13.0 * cos(t) - 5.0 * cos(2.0*t) - 2.0 * cos(3.0*t) - cos(4.0*t))); } //https://www.shadertoy.com/view/3s3GDn float getGlow(float dist, float radius, float intensity){ return pow(radius/dist, intensity); } float getSegment(float t, vec2 pos, float offset, float scale){ for(int i = 0; i < POINT_COUNT; i++){ points[i] = getHeartPosition(offset + float(i)*len + fract(speed * t) * 6.28); } vec2 c = (points[0] + points[1]) / 2.0; vec2 c_prev; float dist = 10000.0; for(int i = 0; i < POINT_COUNT-1; i++){ //https://tinyurl.com/y2htbwkm c_prev = c; c = (points[i] + points[i+1]) / 2.0; dist = min(dist, sdBezier(pos, scale * c_prev, scale * points[i], scale * c)); } return max(0.0, dist); } void main(){ vec2 uv = gl_FragCoord.xy/resolution.xy; float widthHeightRatio = resolution.x/resolution.y; vec2 centre = vec2(0.5, 0.5); vec2 pos = centre - uv; pos.y /= widthHeightRatio; //Shift upwards to centre heart pos.y += 0.02; float scale = 0.000015 * height; float t = time; //Get first segment float dist = getSegment(t, pos, 0.0, scale); float glow = getGlow(dist, radius, intensity); vec3 col = vec3(0.0); //White core col += 10.0*vec3(smoothstep(0.003, 0.001, dist)); //Pink glow col += glow * vec3(1.0,0.05,0.3); //Get second segment dist = getSegment(t, pos, 3.4, scale); glow = getGlow(dist, radius, intensity); //White core col += 10.0*vec3(smoothstep(0.003, 0.001, dist)); //Blue glow col += glow * vec3(0.1,0.4,1.0); //Tone mapping col = 1.0 - exp(-col); //Gamma col = pow(col, vec3(0.4545)); //Output to screen gl_FragColor = vec4(col,1.0); } `; //************** Utility functions ************** window.addEventListener('resize', onWindowResize, false); function onWindowResize(){ canvas.width = window.innerWidth; canvas.height = window.innerHeight; gl.viewport(0, 0, canvas.width, canvas.height); gl.uniform1f(widthHandle, window.innerWidth); gl.uniform1f(heightHandle, window.innerHeight); } //Compile shader and combine with source function compileShader(shaderSource, shaderType){ var shader = gl.createShader(shaderType); gl.shaderSource(shader, shaderSource); gl.compileShader(shader); if(!gl.getShaderParameter(shader, gl.COMPILE_STATUS)){ throw "Shader compile failed with: " + gl.getShaderInfoLog(shader); } return shader; } //From https://codepen.io/jlfwong/pen/GqmroZ //Utility to complain loudly if we fail to find the attribute/uniform function getAttribLocation(program, name) { var attributeLocation = gl.getAttribLocation(program, name); if (attributeLocation === -1) { throw 'Cannot find attribute ' + name + '.'; } return attributeLocation; } function getUniformLocation(program, name) { var attributeLocation = gl.getUniformLocation(program, name); if (attributeLocation === -1) { throw 'Cannot find uniform ' + name + '.'; } return attributeLocation; } //************** Create shaders ************** //Create vertex and fragment shaders var vertexShader = compileShader(vertexSource, gl.VERTEX_SHADER); var fragmentShader = compileShader(fragmentSource, gl.FRAGMENT_SHADER); //Create shader programs var program = gl.createProgram(); gl.attachShader(program, vertexShader); gl.attachShader(program, fragmentShader); gl.linkProgram(program); gl.useProgram(program); //Set up rectangle covering entire canvas var vertexData = new Float32Array([ -1.0, 1.0, // top left -1.0, -1.0, // bottom left 1.0, 1.0, // top right 1.0, -1.0, // bottom right ]); //Create vertex buffer var vertexDataBuffer = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, vertexDataBuffer); gl.bufferData(gl.ARRAY_BUFFER, vertexData, gl.STATIC_DRAW); // Layout of our data in the vertex buffer var positionHandle = getAttribLocation(program, 'position'); gl.enableVertexAttribArray(positionHandle); gl.vertexAttribPointer(positionHandle, 2, // position is a vec2 (2 values per component) gl.FLOAT, // each component is a float false, // don't normalize values 2 * 4, // two 4 byte float components per vertex (32 bit float is 4 bytes) 0 // how many bytes inside the buffer to start from ); //Set uniform handle var timeHandle = getUniformLocation(program, 'time'); var widthHandle = getUniformLocation(program, 'width'); var heightHandle = getUniformLocation(program, 'height'); gl.uniform1f(widthHandle, window.innerWidth); gl.uniform1f(heightHandle, window.innerHeight); var lastFrame = Date.now(); var thisFrame; function draw(){ //Update time thisFrame = Date.now(); time += (thisFrame - lastFrame)/1000; lastFrame = thisFrame; //Send uniforms to program gl.uniform1f(timeHandle, time); //Draw a triangle strip connecting vertices 0-4 gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4); requestAnimationFrame(draw); } draw();
Nội dung ẩn.Nội dung ẩn.
??? tỏ tình mà ny k biết về web :,:Hí anh em chúc anh em 1 ngày tốt lành,nay mình share cho anh em 1 code nho nhỏ học tập,có thể lấy tỏ tình: trái tim nó phát sáng chớp nháy liên tục nhé:
mình sẽ đưa html,css,js bản chưa gắn cho anh em,còn nếu muốn lấy bản hoàn chĩnh gắn sẵn css,js đã optimize thì like comment ủng hộ mình nhé:
HTML:<body> <canvas id="canvas" width="1400" height="600"></canvas> </body>
CSS:body { background-color: #000; margin: 0; overflow: hidden; background-repeat: no-repeat; }
Bản đã gắn sẵn+optimize:JavaScript:var canvas = document.getElementById("canvas"); canvas.width = window.innerWidth; canvas.height = window.innerHeight; // Initialize the GL context var gl = canvas.getContext('webgl'); if(!gl){ console.error("Unable to initialize WebGL."); } //Time var time = 0.0; //************** Shader sources ************** var vertexSource = ` attribute vec2 position; void main() { gl_Position = vec4(position, 0.0, 1.0); } `; var fragmentSource = ` precision highp float; uniform float width; uniform float height; vec2 resolution = vec2(width, height); uniform float time; #define POINT_COUNT 8 vec2 points[POINT_COUNT]; const float speed = -0.5; const float len = 0.25; float intensity = 1.3; float radius = 0.008; //https://www.shadertoy.com/view/MlKcDD //Signed distance to a quadratic bezier float sdBezier(vec2 pos, vec2 A, vec2 B, vec2 C){ vec2 a = B - A; vec2 b = A - 2.0*B + C; vec2 c = a * 2.0; vec2 d = A - pos; float kk = 1.0 / dot(b,b); float kx = kk * dot(a,b); float ky = kk * (2.0*dot(a,a)+dot(d,b)) / 3.0; float kz = kk * dot(d,a); float res = 0.0; float p = ky - kx*kx; float p3 = p*p*p; float q = kx*(2.0*kx*kx - 3.0*ky) + kz; float h = q*q + 4.0*p3; if(h >= 0.0){ h = sqrt(h); vec2 x = (vec2(h, -h) - q) / 2.0; vec2 uv = sign(x)*pow(abs(x), vec2(1.0/3.0)); float t = uv.x + uv.y - kx; t = clamp( t, 0.0, 1.0 ); // 1 root vec2 qos = d + (c + b*t)*t; res = length(qos); }else{ float z = sqrt(-p); float v = acos( q/(p*z*2.0) ) / 3.0; float m = cos(v); float n = sin(v)*1.732050808; vec3 t = vec3(m + m, -n - m, n - m) * z - kx; t = clamp( t, 0.0, 1.0 ); // 3 roots vec2 qos = d + (c + b*t.x)*t.x; float dis = dot(qos,qos); res = dis; qos = d + (c + b*t.y)*t.y; dis = dot(qos,qos); res = min(res,dis); qos = d + (c + b*t.z)*t.z; dis = dot(qos,qos); res = min(res,dis); res = sqrt( res ); } return res; } //http://mathworld.wolfram.com/HeartCurve.html vec2 getHeartPosition(float t){ return vec2(16.0 * sin(t) * sin(t) * sin(t), -(13.0 * cos(t) - 5.0 * cos(2.0*t) - 2.0 * cos(3.0*t) - cos(4.0*t))); } //https://www.shadertoy.com/view/3s3GDn float getGlow(float dist, float radius, float intensity){ return pow(radius/dist, intensity); } float getSegment(float t, vec2 pos, float offset, float scale){ for(int i = 0; i < POINT_COUNT; i++){ points[i] = getHeartPosition(offset + float(i)*len + fract(speed * t) * 6.28); } vec2 c = (points[0] + points[1]) / 2.0; vec2 c_prev; float dist = 10000.0; for(int i = 0; i < POINT_COUNT-1; i++){ //https://tinyurl.com/y2htbwkm c_prev = c; c = (points[i] + points[i+1]) / 2.0; dist = min(dist, sdBezier(pos, scale * c_prev, scale * points[i], scale * c)); } return max(0.0, dist); } void main(){ vec2 uv = gl_FragCoord.xy/resolution.xy; float widthHeightRatio = resolution.x/resolution.y; vec2 centre = vec2(0.5, 0.5); vec2 pos = centre - uv; pos.y /= widthHeightRatio; //Shift upwards to centre heart pos.y += 0.02; float scale = 0.000015 * height; float t = time; //Get first segment float dist = getSegment(t, pos, 0.0, scale); float glow = getGlow(dist, radius, intensity); vec3 col = vec3(0.0); //White core col += 10.0*vec3(smoothstep(0.003, 0.001, dist)); //Pink glow col += glow * vec3(1.0,0.05,0.3); //Get second segment dist = getSegment(t, pos, 3.4, scale); glow = getGlow(dist, radius, intensity); //White core col += 10.0*vec3(smoothstep(0.003, 0.001, dist)); //Blue glow col += glow * vec3(0.1,0.4,1.0); //Tone mapping col = 1.0 - exp(-col); //Gamma col = pow(col, vec3(0.4545)); //Output to screen gl_FragColor = vec4(col,1.0); } `; //************** Utility functions ************** window.addEventListener('resize', onWindowResize, false); function onWindowResize(){ canvas.width = window.innerWidth; canvas.height = window.innerHeight; gl.viewport(0, 0, canvas.width, canvas.height); gl.uniform1f(widthHandle, window.innerWidth); gl.uniform1f(heightHandle, window.innerHeight); } //Compile shader and combine with source function compileShader(shaderSource, shaderType){ var shader = gl.createShader(shaderType); gl.shaderSource(shader, shaderSource); gl.compileShader(shader); if(!gl.getShaderParameter(shader, gl.COMPILE_STATUS)){ throw "Shader compile failed with: " + gl.getShaderInfoLog(shader); } return shader; } //From https://codepen.io/jlfwong/pen/GqmroZ //Utility to complain loudly if we fail to find the attribute/uniform function getAttribLocation(program, name) { var attributeLocation = gl.getAttribLocation(program, name); if (attributeLocation === -1) { throw 'Cannot find attribute ' + name + '.'; } return attributeLocation; } function getUniformLocation(program, name) { var attributeLocation = gl.getUniformLocation(program, name); if (attributeLocation === -1) { throw 'Cannot find uniform ' + name + '.'; } return attributeLocation; } //************** Create shaders ************** //Create vertex and fragment shaders var vertexShader = compileShader(vertexSource, gl.VERTEX_SHADER); var fragmentShader = compileShader(fragmentSource, gl.FRAGMENT_SHADER); //Create shader programs var program = gl.createProgram(); gl.attachShader(program, vertexShader); gl.attachShader(program, fragmentShader); gl.linkProgram(program); gl.useProgram(program); //Set up rectangle covering entire canvas var vertexData = new Float32Array([ -1.0, 1.0, // top left -1.0, -1.0, // bottom left 1.0, 1.0, // top right 1.0, -1.0, // bottom right ]); //Create vertex buffer var vertexDataBuffer = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, vertexDataBuffer); gl.bufferData(gl.ARRAY_BUFFER, vertexData, gl.STATIC_DRAW); // Layout of our data in the vertex buffer var positionHandle = getAttribLocation(program, 'position'); gl.enableVertexAttribArray(positionHandle); gl.vertexAttribPointer(positionHandle, 2, // position is a vec2 (2 values per component) gl.FLOAT, // each component is a float false, // don't normalize values 2 * 4, // two 4 byte float components per vertex (32 bit float is 4 bytes) 0 // how many bytes inside the buffer to start from ); //Set uniform handle var timeHandle = getUniformLocation(program, 'time'); var widthHandle = getUniformLocation(program, 'width'); var heightHandle = getUniformLocation(program, 'height'); gl.uniform1f(widthHandle, window.innerWidth); gl.uniform1f(heightHandle, window.innerHeight); var lastFrame = Date.now(); var thisFrame; function draw(){ //Update time thisFrame = Date.now(); time += (thisFrame - lastFrame)/1000; lastFrame = thisFrame; //Send uniforms to program gl.uniform1f(timeHandle, time); //Draw a triangle strip connecting vertices 0-4 gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4); requestAnimationFrame(draw); } draw();
Nội dung ẩn.Nội dung ẩn.