我有一個正確繪製的畫布對象數組。我有三個問題:使用isPointInPath()和響應式設計的多畫布多邊形檢測映射
- 偏移。我已經在JS小提琴中測試了下面的代碼,它可以工作,但是當我將它導出到我的網頁時,變量會發生偏斜。檢測發生,但沒有在正確的地方。頁面寬度在CSS中設置,實際畫布區域使用margin:0自動調用居中,但是它小於頁面寬度。
<canvas id="canvas" width="780" height="690" style="position:absolute;"></canvas>
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var $canvas = $("#canvas");
var canvasOffset = $canvas.offset();
var offsetX = canvasOffset.left;
var offsetY = canvasOffset.top;
var scrollX = $canvas.scrollLeft();
var scrollY = $canvas.scrollTop();
var $results = $("#results");
// define the polygon items
var polyArray = new Array (6);
polyArray [0] =[{x:50,y:236}, {x:200,y:115}, {x:350,y:50}, {x:350,y:300}, {x:232,y:325}, {x:75,y:300}];
polyArray [1] =[{x:350,y:55}, {x:350,y:300}, {x:510,y:300}, {x:510,y:205}, {x:578,y:172}, {x:690,y:96}, {x:650,y:17}];
polyArray [2] =[{x:510,y:300}, {x:510,y:200}, {x:715,y:113}, {x:780,y:200}, {x:780,y:485}, {x:625,y:468}, {x:605,y:456}, {x:605,y:428}];
polyArray [3] =[{x:0,y:446}, {x:284,y:320}, {x:255,y:540}, {x:240,y:566}, {x:73,y:600}, {x:0,y:565}];
polyArray [4] =[{x:355,y:305}, {x:510,y:305}, {x:604,y:423}, {x:604,y:460}, {x:628,y:484}, {x:610,y:513}, {x:587,y:468}, {x:537,y:426}, {x:500,y:400}, {x:447,y:424}, {x:312,y:365}, {x:307,y:314 }];
polyArray [5] =[{x:350,y:425}, {x:415,y:421}, {x:455,y:434}, {x:495,y:411}, {x:550,y:444}, {x:618,y:590}, {x:570,y:616}, {x:359,y:597}, {x:333,y:522}];
// call the function to draw all the objects in the array
define(polyArray);
// call through the array to draw the objects
function define(polygon) {
ctx.beginPath();
for (var i = 0; i < polygon.length; i++) {
ctx.moveTo(polygon[i][0].x, polygon[i][0].y);
for (var j = 1; j < polygon[i].length; j++) {
ctx.lineTo(polygon[i][j].x, polygon[i][j].y);
}
ctx.fill();
}
ctx.closePath();
}
function hitTest(polygon) {
// redefine the polygon
define(polygon);
// ask isPointInPath to hit test the mouse position
// against the current path
return (ctx.isPointInPath(mouseX, mouseY));
}
function handleMouseMove(e) {
e.preventDefault();
mouseX = parseInt(e.clientX - offsetX);
mouseY = parseInt(e.clientY - offsetY);
// check if the mouse is inside the polygon
var isInside = hitTest(polyArray);
if (isInside) {
canvas.style.cursor = 'pointer';
$results.text("Mouse is inside the area);
} else {
canvas.style.cursor = 'default';
$results.text("Outside");
}
}
$("#canvas").mousemove(function (e) {
handleMouseMove(e);
});
檢測該對象已被懸停。需要發生什麼是懸停的一個陣列形狀應該影響一些CSS/JS。我如何分配ID變量並檢測它?
當我將響應式設計帶入方程時,我有點卡住瞭如何合併這個偏移量和聚合度來適當縮放。
任何一點在正確的方向將不勝感激。
稻田,你有沒有得到這工作了你一個答案?想分享並幫助他人嗎? – Mawg