added triangle shape

src/main/java/org/academiadecodigo/simplegraphics/graphics/Triangle.java

@@ -0,0 +1,163 @@
+package org.academiadecodigo.simplegraphics.graphics;
+
+import java.awt.*;
+
+public class Triangle implements Shape, Colorable, Fillable, Movable {
+
+    private Color color = Color.WHITE;
+    private boolean filled = false;
+    private double x;
+    private double y;
+    private double width;
+    private double height;
+    private int[] xPoints;
+    private int[] yPoints;
+
+    /**
+     * Constructs a triangle.
+     *
+     * @param x      the leftmost x-coordinate
+     * @param y      the topmost y-coordinate
+     * @param width  the width
+     * @param height the height
+     */
+    public Triangle(double x, double y, double width, double height){
+        this.x = x;
+        this.y = y;
+        this.width = width;
+        this.height = height;
+
+        xPoints = new int[3];
+        yPoints = new int[3];
+    }
+
+    /**
+     * Gets the leftmost x-position of this triangle.
+     *
+     * @return the leftmost x-position
+     */
+    @Override
+    public int getX() {
+        return (int) Math.round(x);
+    }
+
+    /**
+     * Gets the topmost y-position of this triangle.
+     *
+     * @return the topmost y-position
+     */
+    @Override
+    public int getY() {
+        return (int) Math.round(y);
+    }
+
+    /**
+     * Gets the width of this triangle.
+     *
+     * @return the width
+     */
+    @Override
+    public int getWidth() {
+        return (int) Math.round(width);
+    }
+
+    /**
+     * Gets the height of this triangle.
+     *
+     * @return the height
+     */
+    @Override
+    public int getHeight() {
+        return (int) Math.round(height);
+    }
+
+    /**
+     * Moves this triangle by a given amount.
+     *
+     * @param dx the amount by which to move in x-direction
+     * @param dy the amount by which to move in y-direction
+     */
+    @Override
+    public void translate(double dx, double dy) {
+        x += dx;
+        y += dy;
+        Canvas.getInstance().repaint();
+    }
+
+    /**
+     * Resizes this triangle both horizontally and vertically.
+     *
+     * @param dw the amount by which to resize the width on each side
+     * @param dh the amount by which to resize the height on each side
+     */
+    @Override
+    public void grow(double dw, double dh) {
+        width += 2 * dw;
+        height += 2 * dh;
+        x -= dw;
+        y -= dh;
+        Canvas.getInstance().repaint();
+    }
+
+    /**
+     * Sets the color of this triangle.
+     *
+     * @param newColor the new color
+     */
+    @Override
+    public void setColor(Color newColor) {
+        color = newColor;
+        Canvas.getInstance().repaint();
+    }
+
+    /**
+     * Draws this triangle.
+     */
+    @Override
+    public void draw() {
+        filled = false;
+        Canvas.getInstance().show(this);
+    }
+
+    /**
+     * Deletes this triangle
+     */
+    @Override
+    public void delete() {
+        Canvas.getInstance().hide(this);
+    }
+
+    /**
+     * Fills this triangle.
+     */
+    @Override
+    public void fill() {
+        filled = true;
+        Canvas.getInstance().show(this);
+    }
+
+    @Override
+    public String toString() {
+        return "Triangle[x=" + getX() + ",y=" + getY() + ",width=" + getWidth() + ",height=" + getHeight() + "]";
+    }
+
+    @Override
+    public void paintShape(Graphics2D g2) {
+        xPoints[0] = (int) (x + Math.round(width / 2));
+        yPoints[0] = (int) y;
+
+        xPoints[1] = (int) x;
+        yPoints[1] = (int) (y + height);
+
+        xPoints[2] = (int) (x + width);
+        yPoints[2] = (int) (y + height);
+
+        g2.setColor(new java.awt.Color((int) color.getRed(), (int) color.getGreen(), (int) color.getBlue()));
+
+        if (filled) {
+            g2.fillPolygon(xPoints, yPoints, 3);
+        } else {
+            g2.drawPolygon(xPoints, yPoints, 3);
+        }
+    }
+}