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ligne et histo

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Theo 2024-10-24 11:14:40 +02:00
parent 4de675fb59
commit 6a2b71cb4d
1 changed files with 266 additions and 131 deletions
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index.html
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@ -1,143 +1,278 @@
<!DOCTYPE html> <!doctype html>
<html lang="en"> <html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>WebGL Line Strip</title>
<style>
canvas { width: 100%; height: 100%; }
</style>
</head>
<body> <body>
<canvas id="glCanvas"></canvas> <canvas width = "300" height = "300" id = "my_Canvas"></canvas>
<script> <script>
// Vertex Shader Source
const vertexShaderSource = `
attribute vec2 a_position;
uniform vec2 u_resolution;
void main() { // Mapping function
// Convert the position from pixels to clipspace function map(smin, smax, val, omin, omax) {
vec2 zeroToOne = a_position / u_resolution; const percent = (val - smin) / (smax - smin);
vec2 zeroToTwo = zeroToOne * 2.0; return (omax - omin) * percent + omin;
vec2 clipSpace = zeroToTwo - 1.0;
gl_Position = vec4(clipSpace * vec2(1, -1), 0, 1); // Flip Y axis
}
`;
// Fragment Shader Source
const fragmentShaderSource = `
precision mediump float;
uniform vec4 u_color;
void main() {
gl_FragColor = u_color;
}
`;
function createShader(gl, type, source) {
const shader = gl.createShader(type);
gl.shaderSource(shader, source);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
console.error("Shader compile error:", gl.getShaderInfoLog(shader));
gl.deleteShader(shader);
return null;
}
return shader;
} }
function createProgram(gl, vertexShader, fragmentShader) { /*======= Creating a canvas =========*/
const program = gl.createProgram();
gl.attachShader(program, vertexShader);
gl.attachShader(program, fragmentShader);
gl.linkProgram(program);
if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {
console.error("Program link error:", gl.getProgramInfoLog(program));
return null;
}
return program;
}
function main() { var canvas = document.getElementById('my_Canvas');
const canvas = document.getElementById("glCanvas"); var gl = canvas.getContext('webgl');
const gl = canvas.getContext("webgl");
if (!gl) {
console.error("WebGL not supported");
return;
}
// Resize canvas to full screen /*======= Filling values =========*/
canvas.width = window.innerWidth; var nc = 3; // Number of curves
canvas.height = window.innerHeight; var courbe = [
[5, 0.1, 0.4, 0.7, 0.9, 1.0], // Example data
// Create shaders [5, 0.2, 0.3, 0.6, 0.8, 0.95],
const vertexShader = createShader(gl, gl.VERTEX_SHADER, vertexShaderSource); [5, 0.05, 0.15, 0.5, 0.75, 0.85],
const fragmentShader = createShader(gl, gl.FRAGMENT_SHADER, fragmentShaderSource);
// Create program
const program = createProgram(gl, vertexShader, fragmentShader);
// Look up attributes and uniforms
const positionLocation = gl.getAttribLocation(program, "a_position");
const resolutionUniformLocation = gl.getUniformLocation(program, "u_resolution");
const colorUniformLocation = gl.getUniformLocation(program, "u_color");
// Create buffer and bind
const positionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer);
// Create some points for the curve (You would populate this with your data)
const points = [
100, 150,
200, 250,
300, 50,
400, 300
]; ];
var valmin = [0.1, 0.2, 0.05];
var valmax = [1.0, 0.95, 0.85];
// Send points to buffer // Drawing modes
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(points), gl.STATIC_DRAW); const HORIZONTAL = 0;
const VERTICAL = 1;
const SUPERPOSER = 2;
// Resize the viewport to match canvas size // Drawing types
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height); const LIGNE = 0;
const LIGNE_AXES = 1;
const HISTOGRAMME = 2;
// Use the program let mode_affichage = HORIZONTAL;
gl.useProgram(program); let type_dessin = HISTOGRAMME;
// Set the resolution function toVertices(index)
gl.uniform2f(resolutionUniformLocation, gl.canvas.width, gl.canvas.height); {
const size = courbe[index][0];
var vertices = new Array(size*3).fill(0);
// Set the color (white) let j = 0;
gl.uniform4f(colorUniformLocation, 1, 1, 1, 1); for (let i = 1; i <= size; i++) {
vertices[j] = map(1, size, i, -1, 1);
// Enable the position attribute if(mode_affichage == SUPERPOSER)
gl.enableVertexAttribArray(positionLocation); {
vertices[j+1] = map(valmin[index], valmax[index], courbe[index][i], -1, 1);
// Bind the position buffer }else
gl.bindBuffer(gl.ARRAY_BUFFER, positionBuffer); {
var start = map(0, nc, index, -1, 1);
// Tell the attribute how to get data out of positionBuffer var end = map(0, nc, index+1, -1, 1);
const size = 2; // 2 components per iteration (x, y) vertices[j+1] = map(valmin[index], valmax[index], courbe[index][i], start, end);
const type = gl.FLOAT; // the data is 32bit floats if(mode_affichage == VERTICAL)
const normalize = false; // don't normalize the data {
const stride = 0; // move forward size * sizeof(type) each iteration [vertices[j], vertices[j+1]] = [vertices[j+1], vertices[j]];
const offset = 0; // start at the beginning of the buffer }
gl.vertexAttribPointer(positionLocation, size, type, normalize, stride, offset); }
// Clear the canvas vertices[j+2] = 0;
gl.clearColor(0, 0, 0, 0); j += 3;
gl.clear(gl.COLOR_BUFFER_BIT); }
return vertices;
// Draw the curve as a line strip }
const primitiveType = gl.LINE_STRIP;
const offsetIndex = 0; function getCurveVertices(index)
const count = points.length / 2; // 2D points {
gl.drawArrays(primitiveType, offsetIndex, count); const size = courbe[index][0];
var vertices = toVertices(index);
// Create an empty buffer object
var vertex_buffer = gl.createBuffer();
// Bind appropriate array buffer to it
gl.bindBuffer(gl.ARRAY_BUFFER, vertex_buffer);
// Pass the vertex data to the buffer
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
// Unbind the buffer
gl.bindBuffer(gl.ARRAY_BUFFER, null);
console.log(vertices);
return vertex_buffer;
}
/*=================== Shaders ====================*/
function setShader()
{
// Vertex shader source code
var vertCode =
'attribute vec3 coordinates;' +
'void main(void) {' +
' gl_Position = vec4(coordinates, 1.0);' +
'}';
// Create a vertex shader object
var vertShader = gl.createShader(gl.VERTEX_SHADER);
// Attach vertex shader source code
gl.shaderSource(vertShader, vertCode);
// Compile the vertex shader
gl.compileShader(vertShader);
// Fragment shader source code
var fragCode =
'void main(void) {' +
'gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);' +
'}';
// Create fragment shader object
var fragShader = gl.createShader(gl.FRAGMENT_SHADER);
// Attach fragment shader source code
gl.shaderSource(fragShader, fragCode);
// Compile the fragmentt shader
gl.compileShader(fragShader);
// Create a shader program object to store
// the combined shader program
var shaderProgram = gl.createProgram();
// Attach a vertex shader
gl.attachShader(shaderProgram, vertShader);
// Attach a fragment shader
gl.attachShader(shaderProgram, fragShader);
// Link both the programs
gl.linkProgram(shaderProgram);
// Use the combined shader program object
gl.useProgram(shaderProgram);
return shaderProgram;
}
var shaderProgram = setShader();
function draw(index)
{
var vertex_buffer = getCurveVertices(index);
// Bind vertex buffer object
gl.bindBuffer(gl.ARRAY_BUFFER, vertex_buffer);
// Get the attribute location
var coord = gl.getAttribLocation(shaderProgram, "coordinates");
// Point an attribute to the currently bound VBO
gl.vertexAttribPointer(coord, 3, gl.FLOAT, false, 0, 0);
// Enable the attribute
gl.enableVertexAttribArray(coord);
// Set the view port
gl.viewport(0,0,canvas.width,canvas.height);
// Draw the triangle
gl.drawArrays(gl.LINE_STRIP, 0, courbe[index][0]);
}
function square(index, squ)
{
const size = courbe[index][0];
x_start = map(1, size, squ, -1, 1);
x_end = map(1, size, squ+1, -1, 1);
y_start = -1;
y_end = map(valmin[index], valmax[index], courbe[index][squ], -1, 1);
if(mode_affichage != SUPERPOSER)
{
y_start = map(0, nc, index, -1, 1);
var end = map(0, nc, index+1, -1, 1);
y_end = map(valmin[index], valmax[index], courbe[index][squ], y_start, end);
}
if(mode_affichage == VERTICAL)
{
[x_start, y_start] = [y_start, x_start];
[x_end, y_end] = [y_end, x_end];
}
var vertices = [
x_start, y_start, 0,
x_end, y_start, 0,
x_end, y_end, 0,
x_start, y_end, 0
]
return vertices;
}
function drawHisto(index)
{
const size = courbe[index][0];
for(let i = 1; i < size; i++)
{
var vertices = square(index, i);
console.log(i);
console.log(vertices);
indices = [0, 2, 1, 0, 3, 2];
// Create an empty buffer object to store vertex buffer
var vertex_buffer = gl.createBuffer();
// Bind appropriate array buffer to it
gl.bindBuffer(gl.ARRAY_BUFFER, vertex_buffer);
// Pass the vertex data to the buffer
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);
// Unbind the buffer
gl.bindBuffer(gl.ARRAY_BUFFER, null);
// Create an empty buffer object to store Index buffer
var Index_Buffer = gl.createBuffer();
// Bind appropriate array buffer to it
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, Index_Buffer);
// Pass the vertex data to the buffer
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(indices), gl.STATIC_DRAW);
// Unbind the buffer
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, null);
// Bind vertex buffer object
gl.bindBuffer(gl.ARRAY_BUFFER, vertex_buffer);
// Bind index buffer object
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, Index_Buffer);
// Get the attribute location
var coord = gl.getAttribLocation(shaderProgram, "coordinates");
// Point an attribute to the currently bound VBO
gl.vertexAttribPointer(coord, 3, gl.FLOAT, false, 0, 0);
// Enable the attribute
gl.enableVertexAttribArray(coord);
// Set the view port
gl.viewport(0,0,canvas.width,canvas.height);
// Draw the triangle
gl.drawElements(gl.TRIANGLES, indices.length, gl.UNSIGNED_SHORT,0);
}
}
gl.clearColor(0, 0, 0, 0.5);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
for(var i = 0; i < nc; i++)
{
if(type_dessin == HISTOGRAMME)
{
drawHisto(i);
}else if(type_dessin == LIGNE){
draw(i);
}
} }
window.onload = main;
</script> </script>
</body> </body>
</html> </html>