Home Explore Help
Sign In
irina_bolbat
/
homework
Watch 1
Star 0
Fork 0
Files Issues 0 Pull Requests 0 Wiki
Browse Source

canvas_2

Iryna Bolbat 3 years ago
parent
dd31b1f506
commit
2fec1f0e97
3 changed files with 371 additions and 0 deletions
Unified View Show Diff Stats
  1. 27 0
      work in class/canvas_2/index.html
  2. 312 0
      work in class/canvas_2/main.js
  3. 32 0
      work in class/canvas_2/style.css

+ 27 - 0
work in class/canvas_2/index.html
View File 

@@ -0,0 +1,27 @@
 
+<!DOCTYPE html>
 
+<html lang="en">
 
+<head>
 
+    <meta charset="UTF-8">
 
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
 
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
 
+    <link href="style.css" rel="stylesheet" type="text/css" />
 
+    <title>Document</title>
 
+</head>
 
+<body>
 
+    <canvas id='canvas' width=400 height=400></canvas> 
+        <button id='undo'>UNDO</button>
 
+        <input type='color' id='color'>
 
+        <select id='tool'>
 
+            <option value='graffity'>Graffity</option>
 
+            <option value='circle'>Circle</option>
 
+            <option value='line'>Line</option>
 
+            <option value='rectangle'>Rectangle</option>
 
+            <option value='ellipse'>Ellipse</option>
 
+            <option value='select'>Select</option>
 
+        </select>
 
+        <input type='number' id='size' value=10>
 
+        <button id='delete'>Delete...</button>
 
+
 
+    <script src="main.js"></script>
 
+</body>
 
+</html>

+ 312 - 0
work in class/canvas_2/main.js
View File 

@@ -0,0 +1,312 @@
 
+const canvas = document.getElementById('canvas')
 
+const ctx    = canvas.getContext('2d')
 
+
 
+const width  = canvas.width;
 
+const height = canvas.height;
 
+
 
+let current;
 
+let selection = []
 
+
 
+const tools = {
 
+    graffity: {
 
+        mousemove(e){ //e.buttons 0b00000x11 & 0b00000100 == x
 
+            (e.buttons & 0b001) && new Circle(e.layerX, e.layerY, +size.value, color.value)
 
+        }
 
+    },
 
+
 
+    circle: {
 
+        mousedown(e){
 
+            current = new Circle(e.layerX,e.layerY, 1, color.value)
 
+        },
 
+        mousemove(e){
 
+            if (!current) return;
 
+
 
+            current.radius = current.distanceTo(e.layerX, e.layerY)
 
+            Drawable.drawAll()
 
+        },
 
+        mouseup(e){
 
+            current = null
 
+        }
 
+    },
 
+
 
+    line: { //ctrl-c ctrl-v в rectangle. Так же добавьте его в <select id='tool'>
 
+        mousedown(e){
 
+            current = new Line(e.layerX, e.layerY, 0, 0, color.value, +size.value)
 
+        },
 
+        mousemove(e){
 
+            if (!current) return;
 
+
 
+            current.width = e.layerX - current.x
 
+            current.height = e.layerY - current.y
 
+
 
+            Drawable.drawAll()
 
+        },
 
+        mouseup(e){
 
+            current = null
 
+        }
 
+    },
 
+
 
+    rectangle: { 
+        mousedown(e){
 
+            current = new Rectangle(e.layerX, e.layerY, 0, 0, color.value, +size.value)
 
+        },
 
+        mousemove(e){
 
+            if (!current) return;
 
+
 
+            current.width = e.layerX - current.x
 
+            current.height = e.layerY - current.y
 
+
 
+            Drawable.drawAll()
 
+        },
 
+        mouseup(e){
 
+            current = null
 
+        }
 
+    },
 
+
 
+    ellipse: { 
+        mousedown(e){
 
+            current = new Ellips(e.layerX, e.layerY, 0, 0, color.value, +size.value)
 
+        },
 
+        mousemove(e){
 
+            if (!current) return;
 
+
 
+            current.width = e.layerX - current.x
 
+            current.height = e.layerY - current.y
 
+
 
+            Drawable.drawAll()
 
+        },
 
+        mouseup(e){
 
+            current = null
 
+        }
 
+    },
 
+
 
+    select: {
 
+        click(e){
 
+            console.log(e)
 
+            let found = Drawable.instances.filter(c => c.in && c.in(e.layerX, e.layerY));
 
+            if (found.length){
 
+                if (e.ctrlKey){
 
+                    selection.push(found.pop());
 
+                }
 
+                else {
 
+                    selection = [found.pop()];
 
+                }
 
+            }
 
+            else {
 
+                if (!e.ctrlKey) selection = []
 
+            }
 
+
 
+            Drawable.drawAll(selection)
 
+        },
 
+        mousedown(e){
 
+            //
 
+        },
 
+        mousemove(e){
 
+
 
+        },
 
+        mouseup(e){
 
+            //x,y, w, h прямоугольника
 
+            //selection - только те элеменеты Drawable.instances которые в границах прямоугольника.
 
+        },
 
+    }
 
+}
 
+
 
+function superHandler(evt){
 
+    let t = tools[tool.value]
 
+    if (typeof t[evt.type] === 'function')
 
+        t[evt.type].call(this, evt)
 
+}
 
+
 
+canvas.onmousemove = superHandler
 
+canvas.onmouseup   = superHandler
 
+canvas.onmousedown = superHandler
 
+canvas.onclick = superHandler
 
+
 
+////
 
+
 
+function Drawable(){
 
+    Drawable.addInstance(this);   
+}
 
+
 
+const distance = (x1,y1, x2, y2) => ((x1-x2)**2 + (y1-y2)**2)**0.5
 
+
 
+Drawable.prototype.draw = function(){};
 
+Drawable.prototype.distanceTo = function(x,y){
 
+    if (typeof this.x !== 'number' ||
 
+        typeof this.y !== 'number'){
 
+        return NaN
 
+    }
 
+    return distance(this.x, this.y, x, y)
 
+};
 
+Drawable.instances = [];
 
+Drawable.addInstance = function(item){
 
+    Drawable.instances.push(item);
 
+}
 
+
 
+Drawable.drawAll = function(selection=[]){
 
+    ctx.clearRect(0,0,width,height);
 
+    Drawable.forAll(item => item.draw())
 
+    selection.forEach(item  => item.draw(true))
 
+}
 
+
 
+Drawable.forAll = function(callback){
 
+    for(var i = 0; i<Drawable.instances.length;i++){
 
+        callback(Drawable.instances[i])
 
+    }
 
+}
 
+
 
+class Circle extends Drawable {
 
+    //__proto__: Drawable.prototype
 
+    constructor(x,y,radius, color){
 
+        super()
 
+        this.x = x;
 
+        this.y = y;
 
+        this.radius = radius;
 
+        this.color = color;
 
+
 
+        this.draw(); 
+    }
 
+
 
+    draw(selected){
 
+        ctx.beginPath();
 
+        ctx.arc(this.x, this.y, this.radius, 0, 2 * Math.PI);
 
+        ctx.closePath();
 
+        ctx.fillStyle = this.color;
 
+        if (selected){
 
+            ctx.lineWidth = 2
 
+            ctx.stroke();
 
+        }
 
+        ctx.fill();
 
+    }
 
+
 
+    in(x,y){
 
+        return this.distanceTo(x,y) < this.radius
 
+    }
 
+
 
+    inBounds(x,y,w,h){ // x = 100, this.x = 102, w = 5
 
+        return  this.x >= x && this.x <= x + w &&
 
+                this.y >= y && this.y <= y + h 
+    }
 
+}
 
+
 
+class Line extends Drawable { //смочь скопировать в Rectangle и поменять отприсовку
 
+    constructor(x,y, width, height, color, lineWidth){
 
+        super()
 
+        this.x      = x;
 
+        this.y      = y;
 
+        this.width  = width;
 
+        this.height = height;
 
+        this.color  = color;
 
+        this.lineWidth  = lineWidth;
 
+
 
+        this.draw(); 
+    }
 
+    
+    draw(selected){
 
+        ctx.beginPath();
 
+        ctx.moveTo(this.x, this.y);
 
+        ctx.lineTo(this.x + this.width, this.y + this.height);
 
+        ctx.closePath();
 
+        ctx.strokeStyle = this.color;
 
+        ctx.lineWidth   = this.lineWidth
 
+        ctx.stroke();
 
+    }
 
+
 
+    in(x, y) {
 
+        let rotateLine = Math.atan2(this.height, this.width)
 
+        let rotCursor = Math.atan2(y - this.y, x - this.x)
 
+        let distanceToPoint = distance(x, y, this.x, this.y)
 
+        let angleLine = rotCursor - rotateLine
 
+        let rotateX = Math.cos(angleLine) * distanceToPoint
 
+        let rotateY = Math.sin(angleLine) * distanceToPoint
 
+        return rotateX >= 0 && rotateX <= this.length && rotateY <= this.lineWidth/2 && rotateY >= -this.lineWidth/2
 
+    }
 
+    get length(){
 
+        return this.distanceTo(this.x + this.width, this.y + this.height)
 
+    }
 
+} 
+
 
+class Rectangle extends Drawable { 
+    constructor(x,y, width, height, color, lineWidth){
 
+        super()
 
+        this.x      = x;
 
+        this.y      = y;
 
+        this.width  = width;
 
+        this.height = height;
 
+        this.color  = color;
 
+        this.lineWidth = lineWidth;
 
+
 
+        this.draw(); 
+    }
 
+    
+    draw(selected){
 
+        ctx.beginPath();
 
+        ctx.rect(this.x, this.y, this.width, this.height);
 
+        ctx.closePath();
 
+        ctx.fillStyle = this.color;
 
+        ctx.lineWidth = 2;
 
+        ctx.fill();
 
+        ctx.stroke();
 
+    }
 
+
 
+    in(x, y) {
 
+        return  this.x <= x &&this.x <= this.x + this.width && 
+                this.y <= y && this.y <= this.y + this.height
 
+    }
 
+} 
+
 
+class Ellips extends Drawable { 
+    constructor(x, y, width, height, color, lineWidth){
 
+        super()
 
+        this.x      = x;
 
+        this.y      = y;
 
+        this.width  = width;
 
+        this.height = height;
 
+        this.color  = color;
 
+        this.lineWidth = lineWidth;
 
+
 
+        this.draw(); 
+    }
 
+    
+    draw(selected){
 
+        ctx.beginPath();
 
+        ctx.ellipse(this.x + this.width / 2, this.y + this.height / 2, this.width / 2, this.height / 2, 0, 0, 2 * Math.PI);
 
+        ctx.closePath();
 
+        ctx.fillStyle = this.color;
 
+        ctx.lineWidth = 2;
 
+        ctx.fill();
 
+        ctx.stroke();
 
+    }
 
+
 
+    in(x, y) {
 
+        const rx = this.width / 2
 
+        const ry = this.height / 2
 
+        const h = this.x + rx
 
+        const k = this.y + ry
 
+
 
+        return ((((x - h) ** 2) / ((rx) ** 2)) + (((y - k) ** 2) / ((ry) ** 2))) <= 1
 
+    }
 
+} 
+
 
+color.onchange = () => {
 
+    selection.forEach(c => c.color = color.value)
 
+    Drawable.drawAll(selection)
 
+}
 
+
 
+document.getElementById('delete').onclick = () =>{
 
+    Drawable.instances = Drawable.instances.filter(item => !selection.includes(item))
 
+    selection = []
 
+    Drawable.drawAll()
 
+}
 
+
 
+//new Line(0,0,100,100, "red")
 
+////new Circle(30,30,10, "red")
 
+
 
+////canvas.onmousemove = function(e){
 
+////}
 
+
 
+//undo.onclick = function(){
 
+    //Drawable.instances.pop()
 
+    ////Drawable.instances = []
 
+    //Drawable.drawAll()
 
+//}

+ 32 - 0
work in class/canvas_2/style.css
View File 

@@ -0,0 +1,32 @@
 
+* {
 
+    box-sizing: border-box;   
+    margin: 0;
 
+    padding: 0;
 
+}
 
+
 
+body {
 
+    margin: 0;
 
+    padding: 0;
 
+}
 
+
 
+button{
 
+    width: 100%;
 
+    font-size: 2em;
 
+}
 
+input, button, select{
 
+    width: 100%;
 
+    font-size: 2em;
 
+}
 
+
 
+table {
 
+    border: 1px;
 
+    border-collapse: collapse;
 
+}
 
+
 
+td,th {
 
+    border: 1px solid black;
 
+}
 
+
 
+/*div#content {*/
 
+    /*display: none;*/
 
+/*}*/