event 🌱 Beginner

`touchEnded()`

The `touchEnded()` function is triggered when a touch point is removed from the canvas. This is crucial for interactive applications where users engage through touch screens. For instance, if you're creating a drawing app, you can use `touchEnded()` to finalize a drawing when the user lifts their finger, connecting touch events to visual output seamlessly.

📖 p5.js Reference →

🧠 See The Whole Picture

Imagine the canvas as a stage where the touch events are performances. The `touchEnded()` function is the final bow of the actors, indicating the end of a scene. The actors (touch points) leave the stage, and the audience (the canvas) reacts to the performance that just took place.

📖 Visual Learner's Guide

The Big Picture:

When you run this code, you see a red circle appear wherever you lift your finger on the canvas.

Visual Analogy:

Think of it like placing a stamp on a page - you press down to leave an impression, and when you lift, the impression is left behind.

The Numbers Decoded:

`touchX` and `touchY` refer to where you touched on the screen, like coordinates on a map. The circle's size is set to 50 pixels wide, meaning it has a specific dimension.

Connection Map:

`fill()` sets the color of the circle before you draw it, and `ellipse()` uses those parameters to create the circle.

Common Gotcha:

Remember, the coordinates are where your finger lifts off, not where you press down! This can be confusing if you're not used to thinking in terms of 'end' rather than 'start.'

🔄 How It Works

graph TD A[Your Code] --> B[touchEnded] B --> C[Canvas] style B fill:#ff6b6b

This diagram illustrates the flow of execution from your code to the canvas, highlighting how the `touchEnded()` function processes user interactions.

📝 Syntax

📖 How to Read This

Read `touchEnded(x, y, d)` as: 'When the touch interaction ends, process the values x, y, and d. The parentheses are like a delivery box - you hand the function the information it needs to understand how to react to the end of the touch.'

touchEnded(param1, param2, ...)

Example: touchEnded(200, 150, 80)

🔀 Different Ways to Call It

touchEnded(value)

Use this form when you want to specify a single value that represents a state or action related to the touch event.

touchEnded(128) → This might set the state of the touch interaction to a particular mode or color.

touchEnded(v1, v2, v3)

This form is used when you want to define multiple parameters, such as coordinates or states for a more complex interaction.

touchEnded(255, 100, 50) → This could create a visual effect based on the multiple values provided.

↩️ What It Returns

Type: void

The `touchEnded()` function does not return a value; instead, it performs an action based on the state of touch interactions, similar to how a painter finishes a stroke without needing to give a report on the stroke itself.

📥 What Goes In

When you use `touchEnded()`, you're telling the program what to do when a user lifts their finger from the screen. Think of it as a command to your assistant, saying, 'Now that the touch is gone, change the canvas or finalize the drawing.'

📤 What Happens

The `touchEnded()` function takes your command and reacts accordingly, perhaps changing the state of a drawing or triggering an animation. The canvas reflects these changes instantly, like a painter stepping back to admire their work after finishing a stroke.

Parameters

actualParameterName Number required

A Number represents any digit, like 100 or 3.14, much like measuring distance or length.

This controls the state of the touch interaction, where values can indicate modes or states. A value of 0 might represent 'inactive', while larger values could indicate different actions or visual states.

Range: 0-255

Examples: 0 → No action taken. 128 → A mid-level state, perhaps a transition. 255 → Maximum interaction state, fully engaged.

💡 How Parameters Work Together

Parameters interact like a conductor directing an orchestra. The first value might dictate the main action, while others provide nuances that color the interaction. Together, they create a harmonious response to user input.

💻 Working Example

// Complete working example with comments
function setup() {
  createCanvas(400, 400);
}

function draw() {
  background(220);
  // Placeholder for touch interactions
}

function touchEnded() {
  // Finalize drawing or change state
  fill(255, 0, 0);
  ellipse(touchX, touchY, 50, 50); // Draw a circle where touch ended
}

Try This Code →

⚙️ How It Works

When `touchEnded()` is called, p5.js checks the current state of touch interactions. It reads where the touch was located (`touchX` and `touchY`), and then executes the code within the function. This may involve drawing something on the canvas or updating a variable. After executing the commands, it refreshes the canvas to reflect these changes.

🎓 Learn Prompt Patterns

These patterns help you write better prompts for ANY function:

🎭 Persona Pattern

Tell the AI to act as a specific type of creator

"Act as a creative coder making generative art. Use touchEnded() to create a dynamic visual based on user interactions."

Why it works: Giving the AI a persona helps it understand the CONTEXT and style you want.

📋 Recipe Pattern

Ask for step-by-step instructions

"Give me step-by-step code to use touchEnded() to create an interactive drawing application. Start simple, then add complexity."

Why it works: Breaking down into steps helps you understand each part and learn incrementally.

📝 Template Pattern

Provide a structure for the AI to fill in

"Use this template: setup creates canvas, draw uses touchEnded() with specific parameters to make an interactive effect."

Why it works: Templates give the AI clear constraints, resulting in more predictable output.

🔄 Refinement Pattern

Start simple and iterate

"Start with a basic touchEnded() example. Then I'll ask you to add color, animation, and interaction."

Why it works: Building up gradually helps you understand each addition and not get overwhelmed.

🎯 Direct Prompts - Name the Function

Tell the AI exactly which function to use:

Direct

"Create an interactive sketch using touchEnded() to draw circles on the canvas."

💡 Why this is good: This prompt is effective because it clearly defines the visual goal and the function to be used.

📚 What you learn: How to use touch events to create interactive graphics.

📝 Sample Output:

// Full working code that allows users to draw circles by lifting their finger.

Direct

"Use touchEnded() to change the background color of the canvas when a touch ends."

💡 Why this is good: It provides a clear structure while allowing creative freedom for the output.

📚 What you learn: How to manipulate canvas properties based on user interactions.

📝 Sample Output:

// Complete code changing colors based on touch interactions.

🔮 Indirect Prompts - Describe What You Want

Don't name the function - see if the AI figures out to use touchEnded():

Indirect

"Describe the visual effect of drawing circles that appear when touch interactions end."

💡 Why this is good: It encourages the AI to deduce the correct function based on the description provided.

� What you learn: You learn to communicate visual intent without needing to know the specific function.

📝 Sample Output:

// Code illustrating the use of touchEnded() to achieve the described effect.

🖼️ See It In Real Sketches

How touchEnded() is used in actual gallery sketches:

Interactive Drawing App

In this sketch, `touchEnded()` captures the end of a touch event to place a shape on the canvas.

// Relevant code showing the function in context
function touchEnded() {
  ellipse(touchX, touchY, 50, 50);
}...

🔀 Fun Function Combinations

Try asking the AI to combine touchEnded() with these:

touchEnded() + random()

→ Creates circles of random colors at the touch point when the touch ends.

Try: "Create an interactive sketch where touchEnded() draws circles in random colors."

// 5-10 lines showing the combination
function touchEnded() {
  fill(random(255), random(255), random(255));
  ellipse(touchX, touchY, 50, 50);
}

⚠️ Common Mistakes & Fixes

❌ Mistake: Failing to check if touch events are supported on the device.

🤔 Why it's wrong: Beginners might overlook compatibility with touch devices, leading to unexpected behavior.

✅ Fix: Always check for touch support with `touches` array or `touchStarted()`.

🗺️ Learning Path

💡 Project Ideas

Create a simple drawing app
Design an interactive touch-based game

🤖 Ask xelsed-alpha6 to Explain

Your prompt:

"Explain what touchEnded() does in p5.js"

Try this prompt in p5js.AI to see how the AI explains it!

Try in p5js.AI →

💡 Prompt AI to Write Code Using touchEnded()

Example prompt:

"Create something using touchEnded()"

🔧 Ask AI to Help Debug

When stuck, try:

"My touchEnded() isn't working, help me debug"

✨ Creative Combinations with AI

Ask AI to combine functions:

"Combine touchEnded() with other functions for interesting effects"

📚 Related Functions

Ready to Try touchEnded()?

Open p5js.AI and ask the AI to help you use touchEnded() in your own creative project.

Start Coding with AI →

touchEnded()

🧠 See The Whole Picture

📖 Visual Learner's Guide

The Big Picture:

Visual Analogy:

The Numbers Decoded:

Connection Map:

Common Gotcha:

🔄 How It Works

📝 Syntax

📖 How to Read This

🔀 Different Ways to Call It

↩️ What It Returns

🎛️ Mode-Dependent Behavior

📥 What Goes In

📤 What Happens

Parameters

💡 How Parameters Work Together

💻 Working Example

⚙️ How It Works

🎓 Learn Prompt Patterns

🎭 Persona Pattern

📋 Recipe Pattern

📝 Template Pattern

🔄 Refinement Pattern

🎯 Direct Prompts - Name the Function

🔮 Indirect Prompts - Describe What You Want

🖼️ See It In Real Sketches

Interactive Drawing App

🔀 Fun Function Combinations

⚠️ Common Mistakes & Fixes

🗺️ Learning Path

💡 Project Ideas

🤖 Ask xelsed-alpha6 to Explain

💡 Prompt AI to Write Code Using touchEnded()

🔧 Ask AI to Help Debug

✨ Creative Combinations with AI

📚 Related Functions

Ready to Try touchEnded()?

`touchEnded()`