Want to draw a line when I touch screen at two points. I can see OnTouch been invoked but after than everything breaks looks, the application crashes
I am using drawLine in Canvas.
CODE:......................
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I'm working on a game which will use projectiles. So I've made a Projectile class and a new instance is created when the user touches the screen:
@Override
public boolean onTouch(View v, MotionEvent e){
float touch_x = e.getX();
float touch_y = e.getY();
new Projectile(touch_x, touch_y);
And the Projectile class:
public class Projectile{
float target_x;
float target_y;
Path line;
public Projectile(float x, float y)
target_x = x;
target_y = y;
line = new Path();
line.moveTo(MyGame.mPlayerXPos, MyGame.mPlayerYPos);
line.lineTo(target_x, target_y);
So this makes a Path with 2 points, the player's position and and touch coords. My question is - How can you access points on this line? For example, if I wanted to get the x,y coords of the Projectile at the half point of the line, or the point the Projectile would be at after 100 ticks (moving at a speed of X pixels/tick)? I also need the Projectile to continue moving after it reaches the final point. Do I need to use line.addPath(line) to keep extending the Path?
I managed to get the Projectiles moving in a straight line, but they're going in strange directions. I had to fudge some code up:
private void moveProjectiles(){
ListIterator<Projectile> it = Registry.proj.listIterator();
while ( it.hasNext() ){
Projectile p = it.next();
p.TimeAlive++;
double dist = p.TimeAlive * p.Speed;
float dx = (float) (Math.cos(p.Angle) * dist);
float dy = (float) (Math.sin(p.Angle) * dist);
p.xPos += dx;
p.yPos += -dy;
The Angle must be the problem. I'm using this method, which works perfectly:
private double getDegreesFromTouchEvent(float x, float y){
double delta_x = x - mCanvasWidth/2;
double delta_y = mCanvasHeight/2 - y;
double radians = Math.atan2(delta_y, delta_x);
return Math.toDegrees(radians);
However, it returns 0-180 for touches above the center of the screen, and 0 to -180 for touches below.
how to draw a line in android give example
View 1 Replies View RelatedMy touchscreen is randomly pressing in an exact straight line near the 2nd column. Utilizing a program called steamy window, I could see exactly where the touchscreen was being touched. See attached photo.
Some Diagnostic Info:
- I live in SC where it has been quite hot.
- It first started this weekend after being in the car dock for 15mins. Afterward the phone was very warm.
- It seems to stop after the phone has cooled.
- It started happening again today in a 78 Degree air conditioned apt. after using the phone for 30mins.
- After letting it sit to type this, it has seemed to stop.
- Pressing the edges of the screen seems to reproduce the issue.
- Moisture stickers still have the red x's on em.
- My screen is as clean as can be
From reading other posts, I'm well aware it could be a moisture/humidity/heat thing. But it shouldn't be doing it in my AC'd apt. I'm also aware some say its greasy fingers/screen. But as I've mentioned my screen is very clean & it still does it.
Some History:
I've had my Droid since November. I've dropped it ONCE on the pavement some time in January/February. Afterward everything has worked fine. About 2/3 months ago I noticed my screen started randomly clicking things. (In my Apt.) Fearing it was going to call someone, I immediately did a battery pull & cleaned the screen. Everything was fine until this weekend.
I'm getting married mid august, and don't have a whole lot of time/money to fix this, but need the phone desperately during the next month. I was hoping someone would have some advice for me.
I do not have insurance. Is this covered under some warranty?
I am rooted (CM5.07/No Theme). Should I do a factory reset b4 I take it in?
Will they do anything other than tell me I'm screwed?
How to draw dotted-line? I know someone already asked this question, but i cann't find the annals. how to draw it or record the message sen
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A very good example of what I try to achieve is shown in the application Steamy Window for Android. Steamy Window simulates a fogged window, where a user can wipe parts of the fog via touch input.
UPDATE: I have posted the most important sections of my current code below. I am not really happy with it for the following reasons:
Drawing is quite sluggish. What can I improve here?
I am looking for a way to use an alpha mask in order to set the pixel transparency/alpha of the pixels as I want to simulate a paint brush. Any suggestions how this could be achieved?
CODE:...................
Code for drawing line that moves horizontally and vertically only on finger touch.
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I'm new to android.
public synchronized void draw(Canvas canvas, MapView mapView, boolean shadow) {
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return;
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Projection projection = mapView.getProjection();
Paint paint = new Paint();
paint.setARGB(250, 255, 0, 0);.............
I'm trying to create a MapView in a service (live wallpaper), but have it hidden so that I can render it to a Bitmap, and then map it to a texture to render in opengl. I have a Canvas and a Bitmap, and I intended to call myMap.draw(myCanvas) in order to get it into the correct bitmap so that I could then bind it as a texture.
When I Initialize I do the following:
myMap = new MapView(ctx, APPSTATICS.MAP_API_KEY);
I get an error:
java.lang.RuntimeException: stub at com.google.android.maps.MapView.<init> (Unknown Source)
Why I can't create a new mapview which I can use to draw to a offscreen bitmap?
I've this code:
Java: (http://nopaste.me/4449 )
package com.patrick.games.whackgroundhog; import android.app.Activity;
import android.content.Context; import android.graphics.Canvas;
import android.graphics.Color; import android.graphics.Paint;
import android.os.Bundle; import android.view.MotionEvent; import android.view.View;
public class Game extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); setContentView(new Ground(this));
} class Ground extends View { public Ground(Context context) { super(context);
} public void onDraw(Canvas canvas) { canvas.drawColor(Color.BLACK);
} @Override public boolean onTouchEvent(MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
//TODO: draw the circle } return true;
} } }
I have a custom component which consists of 2 text view and 4 toggle buttons. I want to draw this view at some specific position on the screen. How is that possible?
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I started looking at the Android platform Monday and I've run into a major problem. I use OpenGL to do all the drawing because it offers the best performance. However, there are several places where I need to render into a texture and then use the texture.
For example:
Use brush texture and a line of sprites to create a black paint stroke in texture A Put brush color+alpha in glColor4f and then draw texture A onto the screen.
On the iPhone, I do this continually as the user's finger moves and I am able to achieve 12-15fps on a 1st gen iPod Touch. It's necessary because applying color and alpha to the individual sprites making up the brush stroke doesn't produce the right result (since sprites overlap and make the stroke too dark).
The android platform supports OpenGL ES 1.0 but seems to omit key functions for dealing with framebuffers. I can't find a way to bind a texture to the framebuffer and draw into it using OpenGL.
Here's how I'd normally go about it on the iPhone:
CODE:....................
Is there anything like this on the Android platform? On the iPhone, OpenGL is significantly faster than software-based drawing and is the only viable solution (trust me - I wrote a CoreGraphics painting app too...). Maybe there's another route I could take on Android? I'm willing to jump through whatever hoops are necessary, but I won't publish the app unless performance is good (10fps+ as you're drawing on the screen).
Ive had the evo for about a week, and the operating system seemed to be acting a bit buggy but i put a fix on that real quick. now a persisting issue i have is that there is a line going down the middle of my screen on every page no matter where i go. i didnt have it for about a day or so and it seems to be some kind of seperation or something.
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