Add virtual Dpad example (Use full for Android)
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GreenSnakeLinux
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examples/core/core_input_virtual_dpad.c
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examples/core/core_input_virtual_dpad.c
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/*******************************************************************************************
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*
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* raylib [core] example - Virtual Dpad
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*
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* Example originally created with raylib 5.0, last time updated with raylib 5.0
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*
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* Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
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* BSD-like license that allows static linking with closed source software
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*
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* Copyright (c) 2014-2024 Ramon Santamaria (@raysan5)
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*
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********************************************************************************************/
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#include "raylib.h"
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#include "raymath.h"
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/**
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* Display a virtual DPad and handle user input screen touch
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* Usage:
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* Call loadDpad before while loop
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* Call onDPadTouchEvent during while loop with parameters: GetTouchX() and GetTouchY()
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* Call updateDpad during while loop with current virtual key press
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* Call drawDpad in while loop between BeginDrawing() and EndDrawing() (outside BeginMode2D)
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*/
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// Define a structure to represent an arc
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typedef struct {
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Vector2 center;
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float radius;
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float startAngle;
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float endAngle;
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} Arc;
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// Initialize the arc rectangles
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Arc upArc, downArc, leftArc, rightArc;
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const float directionSectionAngle = 90.0f;
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const float sectionAngleHalf = 90.0f / 2;
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const float downLowerLimit = 90 - sectionAngleHalf;
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const float downUpperLimit = 90 + sectionAngleHalf;
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const float upLowerLimit = 270 - sectionAngleHalf;
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const float upUpperLimit = 270 + sectionAngleHalf;
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const float leftLowerLimit = 180 - sectionAngleHalf;
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const float leftUpperLimit = 180 + sectionAngleHalf;
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const float rightLowerLimit = 360 - sectionAngleHalf;
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const float rightUpperLimit = sectionAngleHalf;
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const Color arcColor = (Color){ 255, 255, 255, 128};
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Color dpadColor, dpadColorPushed;
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Rectangle arcsRect;
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Vector2 point;
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int currentDirection;
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bool showVirtualPosition;
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/**
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* Initialize DPad
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* @param location of the DPad : KEY_RIGHT or KEY_LEFT
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* @param size of the DPad (300 if set to 0)
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* @color Color of the dpad
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*/
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void loadDpad(int location, Color color, int size) {
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showVirtualPosition = true; // To show the limits where the user can touch the button (Can be deactivated)
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int dPadSize = size == 0 ? 300 : size;
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if (location == KEY_LEFT) {
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arcsRect = (Rectangle) {50.0f, (float) GetScreenHeight() - ((float)size + 50.0f), (float) dPadSize,
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(float) dPadSize};
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} else {
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arcsRect = (Rectangle) {(float) GetScreenWidth() - ((float)size + 50.0f), (float) GetScreenHeight() - ((float)size + 50.0f), (float) dPadSize,
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(float) dPadSize};
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}
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dpadColor = color;
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dpadColorPushed = ColorLerp(color, (Color){ 0, 0, 0, 255 }, 0.5f);
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// Initialize arcs (adjust values as needed)
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upArc.center = (Vector2){ arcsRect.x + arcsRect.width / 2, arcsRect.y };
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upArc.radius = arcsRect.height / 2;
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upArc.startAngle = 0.0f;
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upArc.endAngle = PI / 2;
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downArc.center = (Vector2){ arcsRect.x + arcsRect.width / 2, arcsRect.y + arcsRect.height };
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downArc.radius = arcsRect.height / 2;
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downArc.startAngle = 3 * PI / 2;
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downArc.endAngle = 2 * PI;
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leftArc.center = (Vector2){ arcsRect.x, arcsRect.y + arcsRect.height / 2 };
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leftArc.radius = arcsRect.width / 2;
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leftArc.startAngle = PI;
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leftArc.endAngle = 3 * PI / 2;
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rightArc.center = (Vector2){ arcsRect.x + arcsRect.width, arcsRect.y + arcsRect.height / 2 };
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rightArc.radius = arcsRect.width / 2;
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leftArc.startAngle = PI / 2;
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leftArc.endAngle = PI;
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currentDirection = -1;
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}
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/**
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* Update Dpad button when user press it
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* @param value KEY_UP, KEY_DOWN, KEY_RIGHT or KEY_LEFT
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*/
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void updateDpad(int value) {
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currentDirection = value;
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}
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/**
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* Draw arc
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* @param rect
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* @param startAngle
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* @param endAngle
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* @param fill
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* @param color
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*/
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void DrawArc(Rectangle rect, float startAngle, float endAngle, bool fill, Color color) {
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// Calculate center point and radius of the rectangle
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Vector2 center = { rect.x + rect.width / 2, rect.y + rect.height / 2 };
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float radius = (rect.width > rect.height) ? rect.width / 2 : rect.height / 2;
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// Draw the arc using DrawCircleSector or DrawCircleSectorLines depending of fill parameter
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if(fill) {
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DrawCircleSector(center, radius, startAngle, endAngle, 0, color);
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} else {
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DrawCircleSectorLines(center, radius, startAngle, endAngle, 0, color);
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}
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}
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/**
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* Draw Dpad
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*/
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void drawDpad(void) {
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if (showVirtualPosition) {
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DrawArc(arcsRect, upLowerLimit, upLowerLimit + directionSectionAngle,
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currentDirection == KEY_UP, arcColor);
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DrawArc(arcsRect, downLowerLimit, downLowerLimit + directionSectionAngle,
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currentDirection == KEY_DOWN, arcColor);
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DrawArc(arcsRect, rightLowerLimit, rightLowerLimit + directionSectionAngle,
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currentDirection == KEY_RIGHT, arcColor);
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DrawArc(arcsRect, leftLowerLimit, leftLowerLimit + directionSectionAngle,
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currentDirection == KEY_LEFT, arcColor);
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}
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// Draw the central square
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DrawRectangleRounded((Rectangle){arcsRect.x, arcsRect.y+((float)arcsRect.height/3), (float)arcsRect.width/3, (float)arcsRect.height/3}, 0.5f, (int)0, currentDirection == KEY_LEFT ? dpadColorPushed : dpadColor); // Left
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//DrawRectangleRounded((Rectangle){arcsRect.x+(float)arcsRect.width/3, arcsRect.y+((float)arcsRect.height/3), (float)arcsRect.width/3, (float)arcsRect.height/3}, 0.5f, (int)0, dpadColor); // Center
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DrawRectangleRounded((Rectangle){arcsRect.x+(float)arcsRect.width*2/3, arcsRect.y+((float)arcsRect.height/3), (float)arcsRect.width/3, (float)arcsRect.height/3}, 0.5f, (int)0, currentDirection == KEY_RIGHT ? dpadColorPushed : dpadColor); // Right
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DrawRectangleRounded((Rectangle){arcsRect.x+(float)arcsRect.width/3, arcsRect.y, (float)arcsRect.width/3, (float)arcsRect.height/3}, 0.5f, (int)0, currentDirection == KEY_UP ? dpadColorPushed : dpadColor); // Up
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DrawRectangleRounded((Rectangle){arcsRect.x+(float)arcsRect.width/3, arcsRect.y+(float)arcsRect.height*2/3, (float)arcsRect.width/3, (float)arcsRect.height/3}, 0.5f, (int)0, currentDirection == KEY_DOWN ? dpadColorPushed : dpadColor); // Down
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// Draw arrows
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Vector2 arrowSize = { (float) arcsRect.width / 18, (float) arcsRect.height / 18};
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Vector2 upArrow = { arcsRect.x + (float) arcsRect.width / 2, arcsRect.y + arrowSize.y};
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Vector2 downArrow = { arcsRect.x + (float) arcsRect.width / 2 - arrowSize.x, arcsRect.y + arcsRect.height - arrowSize.y * 2};
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Vector2 leftArrow = { arcsRect.x + arrowSize.x * 2, arcsRect.y + (float) arcsRect.height / 2 - arrowSize.y };
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Vector2 rightArrow = { arcsRect.x + (float) arcsRect.width - arrowSize.x * 2, arcsRect.y + (float) arcsRect.height / 2 - arrowSize.y };
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// Up arrow
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DrawTriangle(upArrow,(Vector2){upArrow.x-arrowSize.x,upArrow.y+arrowSize.y},(Vector2){upArrow.x+arrowSize.x,upArrow.y+arrowSize.y}, BLACK);
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// Down arrow
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DrawTriangle(downArrow,(Vector2){downArrow.x+arrowSize.x,downArrow.y+arrowSize.y},(Vector2){ downArrow.x+arrowSize.x*2, downArrow.y}, BLACK);
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// Left arrow
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DrawTriangle(leftArrow,(Vector2){leftArrow.x-arrowSize.x,leftArrow.y+arrowSize.y},(Vector2){ leftArrow.x, leftArrow.y+arrowSize.y*2}, BLACK);
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// Right arrow
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DrawTriangle(rightArrow,(Vector2){rightArrow.x,rightArrow.y+arrowSize.y*2},(Vector2){ rightArrow.x+arrowSize.x,rightArrow.y+arrowSize.y}, BLACK);
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}
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/**
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* Get DPad button touch by user
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* @param x User x input from GetTouchX()
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* @param y User x input from GetTouchY()
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* @return KEY_UP, KEY_DOWN, KEY_RIGHT or KEY_LEFT
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*/
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int onDPadTouchEvent(int x, int y) {
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point.x = (float) x; point.y = (float) y;
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if (CheckCollisionPointCircle(point, upArc.center, upArc.radius)) {
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// User touched up arc
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return KEY_UP;
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} else if (CheckCollisionPointCircle(point, downArc.center, downArc.radius)) {
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// User touched down arc
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return KEY_DOWN;
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} else if (CheckCollisionPointCircle(point, rightArc.center, rightArc.radius)) {
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// User touched right arc
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return KEY_RIGHT;
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} else if (CheckCollisionPointCircle(point, leftArc.center, leftArc.radius)) {
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// User touched left arc
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return KEY_LEFT;
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}
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return -1;
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}
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//------------------------------------------------------------------------------------
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// Program main entry point
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//------------------------------------------------------------------------------------
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int main(void)
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{
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// Initialization
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//--------------------------------------------------------------------------------------
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const int screenWidth = 800;
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const int screenHeight = 450;
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int currentKey;
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InitWindow(screenWidth, screenHeight, "raylib [core] example - virtual Dpad");
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loadDpad(KEY_LEFT, (Color){ 125, 127, 244, 255 }, 300);
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SetTargetFPS(60); // Set our game to run at 60 frames-per-second
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//--------------------------------------------------------------------------------------
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// Main game loop
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while (!WindowShouldClose()) // Detect window close button or ESC key
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{
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// Update
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//----------------------------------------------------------------------------------
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currentKey = -1;
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if (GetTouchPointCount() > 0) {
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currentKey = onDPadTouchEvent(GetTouchX(), GetTouchY());
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}
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updateDpad(currentKey);
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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BeginDrawing();
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ClearBackground(RAYWHITE);
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drawDpad();
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EndDrawing();
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//----------------------------------------------------------------------------------
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}
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// De-Initialization
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//--------------------------------------------------------------------------------------
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CloseWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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return 0;
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}
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