Hey thanks Mike,
I've managed to do it rather simply with this in case anyone is interested:
// create laser point
var laser = {x:0, y:0, vx:10, vy:10, steps:[], count:0};
onEnterFrame = function()
{
// bounce off the walls
if (laser.x > 400)
{
laser.vx *=-1;
}
else if (laser.x < 0)
{
laser.vx *=-1;
}
if (laser.y > 200)
{
laser.vy *=-1;
}
else if (laser.y < 0)
{
laser.vy *=-1;
}
// update current point
laser.x+=laser.vx;
laser.y+=laser.vy;
// if laser doesn't have a complete history of steps
if (laser.steps.length < 10)
{
// add a step
laser.steps[laser.count] = {x:laser.x, y:laser.y};
// update count
laser.count++;
}
else
{
// remove the oldest step
laser.steps[0] = undefined;
// loop through all steps
for (var i=1;i<laser.steps.length;i++)
{
// shuffle steps back by one position
laser.steps[(i-1)] = laser.steps[i];
}
// add the current position to the top of the stack
laser.steps[10] = {x:laser.x, y:laser.y};
}
// clear drawings from last frame
_root.clear();
// choose base colour for laser
_root.lineStyle(8, 0xFF0000, 80);
// move to laser head point
_root.moveTo(laser.x, laser.y);
// loop through previous steps drawing back to oldest recorded step
for (var i=laser.steps.length-1;i>0;i--)
{
_root.lineTo(laser.steps[i].x, laser.steps[i].y);
}
// change to medium colour
_root.lineStyle(7, 0xFF0099, 100);
// move back to laser head point
_root.moveTo(laser.x, laser.y);
// loop through previous steps drawing back to oldest recorded step
for (var i=laser.steps.length-1;i>0;i--)
{
_root.lineTo(laser.steps[i].x, laser.steps[i].y);
}
// change to topmost colour
_root.lineStyle(4, 0xFFFFFF, 100);
// move back to laser head point
_root.moveTo(laser.x, laser.y);
// loop through previous steps drawing back to the oldest recorded step
for (var i=laser.steps.length-1;i>0;i--)
{
_root.lineTo(laser.steps[i].x, laser.steps[i].y);
}
}
Mike Mountain wrote:
Well I've never made one before - but I'd store an array of the gun,
mirrors, and goals x,y and rotation properties and crawl through them to
draw the line...something like:
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