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projeto.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
<meta content="utf-8" http-equiv="encoding">
</head>
<body>
<canvas id="projectCanvas" width="800" height="600"></canvas>
<script>
var canvas, canvasContext;
var mouseX = 0;
var mouseY = 0;
var mouseDown = false;
const COMPONENT_W = 100;
const COMPONENT_H = 50;
var baseComponent = {
"x": 0,
"y": 0,
"text": 'Base component',
"width": COMPONENT_W,
"height": COMPONENT_H,
"color": 'blue',
"checked": false,
"clicked": false
};
var components = [
{
"x": 0,
"y": 80,
"text": 'Component 0',
"width": COMPONENT_W,
"height": COMPONENT_H,
"color": 'blue',
"checked": false,
"clicked": false
},
{
"x": 100,
"y": 80,
"text": 'Component 1',
"width": COMPONENT_W,
"height": COMPONENT_H,
"color": 'blue',
"checked": false,
"clicked": false
},
{
"x": 201,
"y": 80,
"text": 'Component 2',
"width": COMPONENT_W,
"height": COMPONENT_H,
"color": 'blue',
"checked": false,
"clicked": false
}
];
window.onload = function() {
canvas = document.getElementById('projectCanvas');
canvasContext = canvas.getContext('2d');
var framesPerSecond = 30;
setInterval(updateAll, 1000/framesPerSecond);
canvas.addEventListener('mousemove', updateMousePos);
canvas.addEventListener('click', onClick);
canvas.addEventListener('mousedown', onMouseDown, true);
canvas.addEventListener('mouseup', onMouseUp, true);
}
</script>
<script>
function colorRect(topLeftX,topLeftY, boxWidth,boxHeight, fillColor) {
canvasContext.fillStyle = fillColor;
canvasContext.fillRect(topLeftX,topLeftY, boxWidth,boxHeight);
}
function colorCircle(centerX,centerY, radius, fillColor) {
canvasContext.fillStyle = fillColor;
canvasContext.beginPath();
canvasContext.arc(centerX,centerY, 10, 0,Math.PI*2, true);
canvasContext.fill();
}
function colorText(showWords, textX,textY, fillColor) {
canvasContext.fillStyle = fillColor;
canvasContext.fillText(showWords, textX, textY);
}
</script>
<script>
function updateAll() {
drawAll();
}
function drawAll() {
colorRect(0,0, canvas.width,canvas.height, 'gray'); // clear screen
drawComponents();
colorText(mouseX+","+mouseY, mouseX, mouseY, 'yellow');
}
function drawComponents() {
for(var i = 0; i < components.length; i++){
colorRect(components[i].x,components[i].y, components[i].width-2,components[i].height, components[i].color);
colorText(components[i].text,components[i].x,components[i].y+10,'yellow');
}
colorRect(baseComponent.x,baseComponent.y, baseComponent.width-2,baseComponent.height,baseComponent.color);
colorText(baseComponent.text,baseComponent.x,baseComponent.y+10,'yellow');
}
function checkIfClickInComponent(component, mX, mY){
if(mX > component.x && mX < (component.width+component.x) &&
mY > component.y && mY < (component.height+component.y)){
if(!mouseDown){
console.log("inside component: " + component.title);
component.checked = component.checked ? false : true;
component.color = component.checked ? 'red' : 'blue';
}
return true;
}
return false;
}
</script>
<script>
function updateMousePos(evt) {
var rect = canvas.getBoundingClientRect();
var root = document.documentElement;
mouseX = evt.clientX - rect.left - root.scrollLeft;
mouseY = evt.clientY - rect.top - root.scrollTop;
if(mouseDown){
for(var i = 0; i < components.length; i++){
if(checkIfClickInComponent(components[i], mouseX, mouseY)){
components[i].x = evt.clientX - components[i].width/2;
components[i].y = evt.clientY - components[i].height/2;
}
}
}
}
function onClick(event){
var rect = canvas.getBoundingClientRect();
var root = document.documentElement;
mX = event.clientX - rect.left - root.scrollLeft;
mY = event.clientY - rect.top - root.scrollTop;
for(var i = 0; i < components.length; i++){
checkIfClickInComponent(components[i], mX, mY);
}
if(baseComponent.checked){
components.push(
{
"x": event.clientX - COMPONENT_W/2,
"y": event.clientY - COMPONENT_H/2,
"text": 'Component '+components.length,
"width": COMPONENT_W,
"height": COMPONENT_H,
"color": 'blue',
"checked": false,
"clicked": false
}
);
}
checkIfClickInComponent(baseComponent, mX, mY);
}
function onMouseDown(event){
console.log("mouse press");
mouseDown = true;
}
function onMouseUp(event){
console.log("released mouse");
mouseDown = false;
}
</script>