Create a Flash game like Gold Miner - step 2
I received a lot of emails asking me to add left-right movement to my Gold Miner clone and requiring more information about manually placing the boulders.
In order to add left-right movement, you need to check for left and right arrow keys and move the hook in the proper direction.
Just remember you don't have to let the hook move out of the stage and to update the starting/ending points of the rope.
When you want to manually place boulders, you need an array.
In the one I created, every boulder is an array made this way
[x position, y position, diameter]
Then I created an array containing n boulder arrays where n is the number of boulder I wanted to be in the stage.
Here it is the commented code:
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// boulders are stored in an array
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// [0] is x pos
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// [1] is y pos
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// [2] is the width
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// don't make boulders too large (<50) or the rewind won't work
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// until you change slowdown formula
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boulders = [[100, 100, 30], [200, 100, 40], [300, 100, 40], [400, 100, 30], [100, 200, 30], [200, 200, 40], [300, 200, 40], [400, 200, 30], [100, 300, 30], [200, 300, 40], [300, 300, 40], [400, 300, 30]];
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for (x=0; x<boulders.length; x++) {
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// creating the boulders
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bould = _root.attachMovie("boulder", "boulder_"+_root.getNextHighestDepth(), _root.getNextHighestDepth());
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// placing them in random positions and with random dimensions
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bould._x = boulders[x][0];
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bould._y = boulders[x][1];
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bould._width = boulders[x][2];
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bould._height = boulders[x][2];
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// setting picked attribute as false
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// picked = false => the boulder has not been picked by the hook
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// picked = true => the boulder has been picked
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bould.picked = false;
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// function to be executed at every frame for the boulder
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bould.onEnterFrame = function() {
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// if it's not been picked...
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if (!this.picked) {
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// check if the hook is in shoot mode and touched the boulder
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// you'll see later what do hot_spot_x and hot_spot_y mean
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if (pod_status == "shoot" and this.hitTest(hot_spot_x, hot_spot_y, true)) {
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// set the hook on rewind mode
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pod_status = "rewind";
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// mark this boulder as picked
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this.picked = true;
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// determining the slowdown according to boulder size
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slowdown = Math.floor(this._width/5);
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}
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} else {
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// the boulder has been picked, so move it as the hook moves
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this._x = hot_spot_x;
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this._y = hot_spot_y;
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// if the hook status changed to rotate
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// (this means: if the hook took a boulder and pulled it out to surface...
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if (pod_status == "rotate") {
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// remove the boulder
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this.removeMovieClip();
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}
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}
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};
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}
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// placing the hook on stage
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_root.attachMovie("pod", "pod", _root.getNextHighestDepth(), {_x:250});
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// creating an empty movie clip to draw the rope
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_root.createEmptyMovieClip("rod", _root.getNextHighestDepth());
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// this is the rotation direction and speed
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rotation_dir = 2;
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// hook initial status
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pod_status = "rotate";
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// slowdown malus
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slowdown = 0;
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// hook movement speed
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pod_speed = 4;
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// function the hook will execute at every frame
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pod.onEnterFrame = function() {
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// getting pod status
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switch (pod_status) {
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case "rotate" :
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// moving the hook to the left if player presses left
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if (Key.isDown(Key.LEFT)) {
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this._x -= pod_speed;
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if (this._x<20) {
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this._x = 20;
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}
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}
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// moving the hook to the right if player presses left
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if (Key.isDown(Key.RIGHT)) {
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this._x += pod_speed;
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if (this._x>480) {
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this._x = 480;
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}
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}
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// if the status is rotate, just rotate the hook according to rotation_dir
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this._rotation += rotation_dir;
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if (this._rotation == 80 or this._rotation == -80) {
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// invert rotation_dir if the hook reaches its minimum (or maximum) rotation allowed
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rotation_dir *= -1;
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}
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break;
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case "shoot" :
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// the hook has ben shoot
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// (re)set slowdown malus to zero
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slowdown = 0;
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// moving the hook using trigonometry
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this._x += 10*Math.cos(dir);
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this._y += 10*Math.sin(dir);
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// determining the hot spot of the hook
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// the hot spot is the lowest corner of the hook (that acts like an harpoon in this case)
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hot_spot_x = this._x+40*Math.cos(dir);
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hot_spot_y = this._y+40*Math.sin(dir);
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// if the hot spot goes off the stage
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if (hot_spot_y>400 or hot_spot_x<0 or hot_spot_x>500) {
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// then rewind the hook
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pod_status = "rewind";
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}
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// draw a line from the hook starting position to its actual position
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// this will simulate the rope
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rod.clear();
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rod.lineStyle(1, 0x000000);
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// once it started from (250,0), now that hook can move I am starting from (start_rope_x, 0)
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rod.moveTo(start_rope_x, 0);
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rod.lineTo(this._x, this._y);
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break;
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case "rewind" :
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// clearing the rope
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rod.clear();
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// rewinding the hook...
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// it may seem a nonsense determining the hot spot now, but I need id
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// to move the boulder (if I have any boulder attached to the hook)
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hot_spot_x = this._x+40*Math.cos(dir);
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hot_spot_y = this._y+40*Math.sin(dir);
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// moving the hook with slowdown malus (if any)
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this._x -= (10-slowdown)*Math.cos(dir);
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this._y -= (10-slowdown)*Math.sin(dir);
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// if the hook returns in its initial position...
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if (this._y<0) {
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// then reset its position and set its status to rotate
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this._y = 0;
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this._x = start_rope_x;
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pod_status = "rotate";
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} else {
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// drawing a line as seen in shoot status, but only if the hook is still in the air
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rod.lineStyle(1, 0x000000);
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rod.moveTo(start_rope_x, 0);
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rod.lineTo(this._x, this._y);
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}
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break;
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}
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};
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// when the mouse is clicked...
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_root.onMouseDown = function() {
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// if the status is rotate...
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if (pod_status == "rotate") {
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// save hook heading and convert it to radians
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dir = (pod._rotation+90)*0.0174532925;
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// setting rope start position... the last hook position
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start_rope_x = pod._x;
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// set pod status to shoot
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pod_status = "shoot";
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}
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};
And here it is the result...
Left/right arrows to move, mousebutton to fire.
Download the source code and enjoy
Tell me what do you think about this post. I'll write better and better entries.
They can be easily customized to meet the unique requirements of your project.
9 Responses to “Create a Flash game like Gold Miner - step 2”
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thank you!
Can’t wait to see AS3.0 version of Gold Miner example code.
BTW How can we make it so the spike change on picking up and penetrates the boulder, also changing the boulder, with sprites maybe?
I’m trying but no luck.
Erv, one way you could do this would be to simply create another frame for the pod. Then where the pod “picks” the boulder just add a frame change for the pod.
I have my pod changing frames when the user clicks the mouse so it opens, then closes when it touches a boulder. Or it closes when it reaches the outside of the level.
Hi, thanks… im going to develop one soon.
Kevin, yes but if you play the real Gold Miner game you will see that when you hit a Bag, the pod penetrates it also differs depending what object you’re picking up.
Maybe that could be on hit, remove object movie and set pod frame on the frame where u pick up the kind of boulder?
I think something is wrong with your RSS Feed. The latest article I have from you is “tips for learning a new language”. It seems to only update the feed sporadically.
IM GONNA MAKE MY FIRST FLASH GAME!
is it possible to get an as3 version of this prototype ? thanks.