59 lines
1.4 KiB
Go
59 lines
1.4 KiB
Go
package d2maprenderer
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import "github.com/OpenDiablo2/OpenDiablo2/d2common/d2math/d2vector"
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// Camera is the position of the Camera perspective in orthogonal world space. See viewport.go.
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type Camera struct {
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position *d2vector.Position
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target *d2vector.Position
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}
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// MoveTo sets the position of the Camera to the given position
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func (c *Camera) MoveTo(position *d2vector.Position) {
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c.position = position
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c.target = position
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}
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// MoveBy adds the given vector to the current position of the Camera.
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func (c *Camera) MoveBy(vector *d2vector.Vector) {
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c.position.Add(vector)
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}
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// SetTarget sets the target position
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func (c *Camera) SetTarget(target *d2vector.Position) {
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c.target = target
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}
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// MoveTargetBy adds the given vector to the current position of the Camera.
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func (c *Camera) MoveTargetBy(vector *d2vector.Vector) {
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if c.target == nil {
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v := c.position.Clone()
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c.target = &d2vector.Position{Vector: *v}
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}
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c.target.Add(vector)
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}
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// ClearTarget sets the target position
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func (c *Camera) ClearTarget() {
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c.target = nil
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}
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// GetPosition returns the Camera position
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func (c *Camera) GetPosition() *d2vector.Position {
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return c.position
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}
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// Advance returns the Camera position
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func (c *Camera) Advance(elapsed float64) {
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c.advanceToTarget(elapsed)
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}
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func (c *Camera) advanceToTarget(_ float64) {
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if c.target != nil {
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diff := c.position.World().Subtract(c.target.World())
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diff.Scale(-0.85)
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c.MoveBy(diff)
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}
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}
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