Javascript html5中完美像素与画布冲突的问题
我想我已经接近这个目标了,但是我很难弄清楚我到底错过了什么。我正试图在画布上进行“像素完美”的碰撞检测。代码在Github和中提供 假设我已经确定发生了轻微的碰撞,下一步是检查重叠区域的像素级别 到目前为止,我的测试代码是:Javascript html5中完美像素与画布冲突的问题,javascript,html,canvas,collision-detection,pixel-perfect,Javascript,Html,Canvas,Collision Detection,Pixel Perfect,我想我已经接近这个目标了,但是我很难弄清楚我到底错过了什么。我正试图在画布上进行“像素完美”的碰撞检测。代码在Github和中提供 假设我已经确定发生了轻微的碰撞,下一步是检查重叠区域的像素级别 到目前为止,我的测试代码是: // Ok, compute the rectangle of overlap: if (bottom1 > bottom2) { over_bottom = bottom2; } els
// Ok, compute the rectangle of overlap:
if (bottom1 > bottom2) { over_bottom = bottom2;
} else { over_bottom = bottom1; }
if (top1 < top2) { over_top = top2;
} else { over_top = top1; }
if (right1 > right2) { over_right = right2;
} else { over_right = right1; }
if (left1 < left2) { over_left = left2;
} else { over_left = left1; }
if (Sprite.debug == 1) {
// again for the purposes of global debuggery I thought it'd be nice to be able to
// draw the area of overlap, but without ruining all other tests
MainContext.fillStyle = "rgb(200,0,0)";
MainContext.fillRect (over_left, over_top, over_right-over_left, over_bottom-over_top);
}
overlap_width = over_right-over_left;
overlap_height = over_bottom-over_top;
if (Sprite.Xpos > obj.Xpos) {
// read the data start at the sprite's right side
var sprite_data_x_start = Sprite.Xpos +Sprite.width -overlap_width;
var obj_data_x_start = obj.Xpos;
} else {
// read the data from the sprites left.
var sprite_data_x_start = Sprite.Xpos;
var obj_data_x_start = obj.Xpos +obj.width -overlap_width;
}
if (Sprite.Ypos > obj.Ypos) {
// read the data start at the sprite's right side
var sprite_data_y_start = Sprite.Ypos +Sprite.height -overlap_height;
var obj_data_y_start = obj.Ypos;
} else {
// read the data from the sprites left.
var sprite_data_y_start = Sprite.Ypos;
var obj_data_y_start = obj.Ypos +obj.height -overlap_height;
}
// 1. get the coordinates of the overlapped area for box object1
// 2. get the coordinates of the overlapped area for this Sprite
// 3. get the data for each into an array using GETIMAGEDATA
// eg:
var sprite_overlap_image = Sprite.ctx.getImageData( sprite_data_x_start,
sprite_data_y_start,
overlap_width,
overlap_height);
var obj_overlap_image = obj.ctx.getImageData( obj_data_x_start,
obj_data_y_start,
overlap_width,
overlap_height);
//soid = sprite_overlap_image.data;
soid = sprite_overlap_image;
GlobalWatchSOID = sprite_overlap_image;
GlobalWatchOOID = obj_overlap_image;
ooid = obj_overlap_image;
//MainContext.putImageData(sprite_overlap_image.data, 100, 100);
//MainContext.putImageData(obj_overlap_image.data, 400, 400);
for (idx in soid.data) {
if (!isNaN(idx)) {
if ((soid.data[idx] == 0 && ooid.data[idx] == 0)) {
return true;
//console.log(idx + ' ' + soid.data[idx] + ' omg hit! ' + ooid.data[idx]);
}
}
}
return false;
//好,计算重叠的矩形:
如果(bottom1>bottom2){over_bottom=bottom2;
}else{over_bottom=bottom1;}
如果(top1right2){over_right=right2;
}else{over_right=right1;}
如果(left1obj.Xpos){
//从精灵右侧开始读取数据
var sprite_data_x_start=sprite.Xpos+sprite.width-重叠宽度;
var obj_data_x_start=obj.Xpos;
}否则{
//从左边的精灵读取数据。
var sprite_data_x_start=sprite.Xpos;
var obj_data_x_start=obj.Xpos+obj.width-重叠宽度;
}
if(Sprite.Ypos>obj.Ypos){
//从精灵右侧开始读取数据
var sprite_data_y_start=sprite.Ypos+sprite.height-重叠高度;
var obj_data_y_start=obj.Ypos;
}否则{
//从左边的精灵读取数据。
var sprite_data_y_start=sprite.Ypos;
var obj_data_y_start=obj.Ypos+obj.height-重叠高度;
}
// 1. 获取box object1重叠区域的坐标
// 2. 获取此精灵重叠区域的坐标
// 3. 使用GETIMAGEDATA将每个的数据获取到一个数组中
//例如:
var sprite_overlap_image=sprite.ctx.getImageData(sprite_data_x_start,
sprite_数据_y_开始,
重叠宽度,
重叠高度);
var obj_overlap_image=obj.ctx.getImageData(obj_data_x_start,
obj_数据_y_开始,
重叠宽度,
重叠高度);
//soid=sprite\u overlap\u image.data;
soid=精灵重叠图像;
GlobalWatchSOID=精灵重叠图像;
GlobalWatchOOID=对象重叠图像;
ooid=对象重叠图像;
//MainContext.putImageData(sprite\u overlap\u image.data,100100);
//MainContext.putImageData(obj_overlap_image.data,400400);
用于(固体数据中的idx){
如果(!isNaN(idx)){
if((soid.data[idx]==0&&ooid.data[idx]==0)){
返回true;
//log(idx++'+soid.data[idx]+'omg hit!'+ooid.data[idx]);
}
}
}
返回false;
通过在Chrome调试器中检查DOM,我知道我肯定能够遍历图像中的每个像素,但我无法理解的是,为什么我在索引处对array1中的像素和array2中的像素进行的比较似乎从未重叠
有人能看到我出错的地方吗?也许这里的某个地方有逻辑错误,也许我没有阅读我认为我得到的方块或其他东西
如果我发现了,我会继续努力更新,但更多时候,Stack比我聪明得多:)我已经破解了它
if (Sprite.Xpos > obj.Xpos) {
// read the data start at the sprite's right side
//var sprite_data_x_start = Sprite.Xpos -Sprite.width -overlap_width;
var sprite_data_x_start = Sprite.width -overlap_width;
var obj_data_x_start = 0;
} else {
// read the data from the sprites left.
var sprite_data_x_start = Sprite.Xpos;
var obj_data_x_start = 0 -overlap_width;
}
if (Sprite.Ypos > obj.Ypos) {
// read the data start at the sprite's right side
var sprite_data_y_start = Sprite.height -overlap_height;
var obj_data_y_start = 0;
} else {
// read the data from the sprites left.
var sprite_data_y_start = 0;
var obj_data_y_start = obj.height -overlap_height;
}
我拉错了单个画布对象的区域。我已经破解了它
if (Sprite.Xpos > obj.Xpos) {
// read the data start at the sprite's right side
//var sprite_data_x_start = Sprite.Xpos -Sprite.width -overlap_width;
var sprite_data_x_start = Sprite.width -overlap_width;
var obj_data_x_start = 0;
} else {
// read the data from the sprites left.
var sprite_data_x_start = Sprite.Xpos;
var obj_data_x_start = 0 -overlap_width;
}
if (Sprite.Ypos > obj.Ypos) {
// read the data start at the sprite's right side
var sprite_data_y_start = Sprite.height -overlap_height;
var obj_data_y_start = 0;
} else {
// read the data from the sprites left.
var sprite_data_y_start = 0;
var obj_data_y_start = obj.height -overlap_height;
}
我拉错了各个画布对象的区域。我想在我有空闲时间的时候看看这个,如果这仍然是一个问题Hi Simon,这仍然是一个问题,同样的,我这个周末也被分心了,这个问题看起来有点“不可克服”。我在想我应该看看WebSocket、node.js和多个牛头怪,而这一个在我脑海中翻转。(我也可以尝试在Github上找到一个有像素冲突的JS游戏引擎,看看它们在做什么)。我相信这一个很接近!我上周浏览了一下,可能会有帮助。我想在我有空的时候看看这个,如果这仍然是一个问题的话。我西蒙,这仍然是一个问题,同样的,这个周末我被分心了,这个问题看起来有点“不可克服”。我在想我应该看看WebSocket、node.js和多个牛头怪,而这一个在我脑海中翻转。(我也可以尝试在Github上找到一个有像素冲突的JS游戏引擎,看看它们在做什么)。我相信这一个很接近!我上周浏览了一下,可能会有帮助。