在画布图中显示工具提示 [英] Display tooltip in canvas graph
本文介绍了在画布图中显示工具提示的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在使用html5 canvas元素绘制带有圆点的图形，表示 此处 。
I am using html5 canvas element to draw a graph with dots denoting various points in here.
我想在鼠标悬停的不同点上显示不同的工具提示。将显示为工具提示的文本将由用户。
I want to display different tool-tip on different points on mouse hover.the text to be displayed as tool-tip will be provided by the user.
我试过但无法弄清楚如何在图表中的各个点添加工具提示。我用于显示点的代码是..
I tried but couldn't figure out how to add tool-tip to various points in the graph.The code I'm using for displaying dots is..
// Draw the dots
c.fillStyle = '#333';
for (var i = 0; i < data.values.length; i++) {
c.beginPath();
c.arc(getXPixel(data.values[i].X), getYPixel(data.values[i].Y), 4, 0, Math.PI * 2, true);
c.fill();
}
我应该在此代码中添加什么，以便我能够显示用户输入为工具提示？
What addition should I make in this code so that i am able to display user input as tool-tip?
推荐答案
当用户在图表的数据点上移动时，您可以显示工具提示
此工具提示只是第二个画布，它从链接的文本框中绘制文本，并将其自身置于数据点上方。
This tooltip is simply a second canvas which draws the text from the linked textbox and is positions itself above the data-dot.
首先，您创建一个数组来保存每个数据点的工具提示信息。
First you create an array to hold the tooltip info for each of your data-dots.
var dots = [];
对于每个工具提示，您需要：
For each tooltip, you will need:
- 数据点的x / y坐标，
- 数据点的半径，
- 您希望从中获取提示的文本框的ID。
- 您还需要rXr，它总是==半径平方（在命中测试期间需要）
- The x/y coordinate of the data-dot,
- The radius of the data-dot,
- The id of the textbox you want to get the tip from.
- You also need rXr which always == radius squared (needed during hit testing)
以下是创建以点数存储的工具提示信息的代码[]
Here is the code for creating tooltip info to be stored in dots[]
// define tooltips for each data point
for(var i = 0; i < data.values.length; i ++) {
dots.push({
x: getXPixel(data.values[i].X),
y: getYPixel(data.values[i].Y),
r: 4,
rXr: 16,
tip: "#text"+(i+1)
});
}
然后设置一个通过点数组查看的mousemove处理程序。如果用户在任何data = dot内移动，则显示工具提示：
Then you set up a mousemove handler that looks through the dots array. The tooltip is displayed if the user moves inside any data=dot:
// request mousemove events
$("#graph").mousemove(function(e){handleMouseMove(e);});
// show tooltip when mouse hovers over dot
function handleMouseMove(e){
mouseX=parseInt(e.clientX-offsetX);
mouseY=parseInt(e.clientY-offsetY);
// Put your mousemove stuff here
var hit = false;
for (var i = 0; i < dots.length; i++) {
var dot = dots[i];
var dx = mouseX - dot.x;
var dy = mouseY - dot.y;
if (dx * dx + dy * dy < dot.rXr) {
tipCanvas.style.left = (dot.x) + "px";
tipCanvas.style.top = (dot.y - 40) + "px";
tipCtx.clearRect(0, 0, tipCanvas.width, tipCanvas.height);
tipCtx.fillText($(dot.tip).val(), 5, 15);
hit = true;
}
}
if (!hit) { tipCanvas.style.left = "-200px"; }
}
这是代码和小提琴： http：// jsfiddle.net/m1erickson/yLBjM/
<!doctype html>
<html>
<head>
<link rel="stylesheet" type="text/css" media="all" href="css/reset.css" /> <!-- reset css -->
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<style>
body{ background-color: ivory; margin-top:35px; }
#wrapper{position:relative; width:300px; height:150px;}
canvas{border:1px solid red;}
#tip{background-color:white; border:1px solid blue; position:absolute; left:-200px; top:100px;}
</style>
<script>
$(function(){
var graph = document.getElementById("graph");
var ctx = graph.getContext("2d");
var tipCanvas = document.getElementById("tip");
var tipCtx = tipCanvas.getContext("2d");
var canvasOffset = $("#graph").offset();
var offsetX = canvasOffset.left;
var offsetY = canvasOffset.top;
var graph;
var xPadding = 30;
var yPadding = 30;
// Notice I changed The X values
var data = { values:[
{ X: 0, Y: 12 },
{ X: 2, Y: 28 },
{ X: 3, Y: 18 },
{ X: 4, Y: 34 },
{ X: 5, Y: 40 },
{ X: 6, Y: 80 },
{ X: 7, Y: 80 }
]};
// define tooltips for each data point
var dots = [];
for(var i = 0; i < data.values.length; i ++) {
dots.push({
x: getXPixel(data.values[i].X),
y: getYPixel(data.values[i].Y),
r: 4,
rXr: 16,
color: "red",
tip: "#text"+(i+1)
});
}
// request mousemove events
$("#graph").mousemove(function(e){handleMouseMove(e);});
// show tooltip when mouse hovers over dot
function handleMouseMove(e){
mouseX=parseInt(e.clientX-offsetX);
mouseY=parseInt(e.clientY-offsetY);
// Put your mousemove stuff here
var hit = false;
for (var i = 0; i < dots.length; i++) {
var dot = dots[i];
var dx = mouseX - dot.x;
var dy = mouseY - dot.y;
if (dx * dx + dy * dy < dot.rXr) {
tipCanvas.style.left = (dot.x) + "px";
tipCanvas.style.top = (dot.y - 40) + "px";
tipCtx.clearRect(0, 0, tipCanvas.width, tipCanvas.height);
tipCtx.fillText($(dot.tip).val(), 5, 15);
hit = true;
}
}
if (!hit) { tipCanvas.style.left = "-200px"; }
}
//未更改的代码如下
// unchanged code follows
// Returns the max Y value in our data list
function getMaxY() {
var max = 0;
for(var i = 0; i < data.values.length; i ++) {
if(data.values[i].Y > max) {
max = data.values[i].Y;
}
}
max += 10 - max % 10;
return max;
}
// Returns the max X value in our data list
function getMaxX() {
var max = 0;
for(var i = 0; i < data.values.length; i ++) {
if(data.values[i].X > max) {
max = data.values[i].X;
}
}
// omited
//max += 10 - max % 10;
return max;
}
// Return the x pixel for a graph point
function getXPixel(val) {
// uses the getMaxX() function
return ((graph.width - xPadding) / (getMaxX() + 1)) * val + (xPadding * 1.5);
// was
//return ((graph.width - xPadding) / getMaxX()) * val + (xPadding * 1.5);
}
// Return the y pixel for a graph point
function getYPixel(val) {
return graph.height - (((graph.height - yPadding) / getMaxY()) * val) - yPadding;
}
graph = document.getElementById("graph");
var c = graph.getContext('2d');
c.lineWidth = 2;
c.strokeStyle = '#333';
c.font = 'italic 8pt sans-serif';
c.textAlign = "center";
// Draw the axises
c.beginPath();
c.moveTo(xPadding, 0);
c.lineTo(xPadding, graph.height - yPadding);
c.lineTo(graph.width, graph.height - yPadding);
c.stroke();
// Draw the X value texts
var myMaxX = getMaxX();
for(var i = 0; i <= myMaxX; i ++) {
// uses data.values[i].X
c.fillText(i, getXPixel(i), graph.height - yPadding + 20);
}
/* was
for(var i = 0; i < data.values.length; i ++) {
// uses data.values[i].X
c.fillText(data.values[i].X, getXPixel(data.values[i].X), graph.height - yPadding + 20);
}
*/
// Draw the Y value texts
c.textAlign = "right"
c.textBaseline = "middle";
for(var i = 0; i < getMaxY(); i += 10) {
c.fillText(i, xPadding - 10, getYPixel(i));
}
c.strokeStyle = '#f00';
// Draw the line graph
c.beginPath();
c.moveTo(getXPixel(data.values[0].X), getYPixel(data.values[0].Y));
for(var i = 1; i < data.values.length; i ++) {
c.lineTo(getXPixel(data.values[i].X), getYPixel(data.values[i].Y));
}
c.stroke();
// Draw the dots
c.fillStyle = '#333';
for(var i = 0; i < data.values.length; i ++) {
c.beginPath();
c.arc(getXPixel(data.values[i].X), getYPixel(data.values[i].Y), 4, 0, Math.PI * 2, true);
c.fill();
}
}); // end $(function(){});
</script>
</head>
<body>
<div id="wrapper">
<canvas id="graph" width=300 height=150></canvas>
<canvas id="tip" width=100 height=25></canvas>
</div>
<br><br>
<input type="text" id="text1" value="text 1"/><br><br>
<input type="text" id="text2" value="text 2"/><br><br>
<input type="text" id="text3" value="text 3"/><br><br>
<input type="text" id="text4" value="text 4"/><br><br>
<input type="text" id="text5" value="text 5"/><br><br>
<input type="text" id="text6" value="text 6"/><br><br>
<input type="text" id="text7" value="text 7"/><br><br>
</body>
</html>
这篇关于在画布图中显示工具提示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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